What is the cheapest airline that flies from United States to Illinois?

United Airlines, American Airlines, and Frontier are the most popular carriers operating from United States to Illinois

How long is the flight from United States to Illinois?

The flight from United States to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from New York (a popular airport in United States) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 2h 45m on average. If you fly from Boston (another popular airport in United States) to Chicago O'Hare Intl Airport, then the average flight time is 2h 48m.

What airlines fly to Illinois?

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to Illinois from United States according to our data. United Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 11 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

How many flights depart from United States to Illinois on average per week?

The number of flights available between United States and Illinois is 3,172 per week as of August 2026. The most frequent departure day is Sun, with 17% of weekly flights leaving on this day.

How many flights depart from United States to Illinois on average per day?

As of August 2026, 453 flights take off from United States and land in Illinois each day. The most common flight departure time for this route is 8:00AM, with 39% of daily flights taking off at noon.

When did momondo last update prices for flights from United States to Illinois?

Prices for flights from United States to Illinois refresh daily.

How many operators does momondo search for flights from United States to Illinois?

As of August 2026, there are 7 operators available to choose from for flights from United States to Illinois.

How old do you have to be to fly from United States to Illinois?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from United States to Illinois.

What documentation or ID do you need to fly to Illinois?

The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$89 Cheap Flights from the United States to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from the United States to Illinois

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

11:54 am - 1:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 36mnonstop

7:25 am - 10:49 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 24mnonstop

$166Frontier

Mon, Sep 21 - Thu, Sep 24

9:09 pm - 10:43 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 34mnonstop

4:42 pm - 7:58 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 16mnonstop

$167Frontier

Thu, Nov 12 - Sun, Nov 15

3:47 pm - 5:05 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 18mnonstop

8:50 am - 11:55 amORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

$177United Airlines

Wed, Oct 21 - Thu, Oct 22

3:15 pm - 4:29 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

2h 14mnonstop

9:52 pm - 12:58 amORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

2h 06mnonstop

$177United Airlines

Wed, Sep 23 - Thu, Sep 24

7:18 am - 8:50 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 32mnonstop

9:00 pm - 11:59 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

1h 59mnonstop

$177American Airlines

Sat, Nov 14 - Sat, Nov 21

11:40 am - 12:59 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

9:12 pm - 12:16 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 04mnonstop

$177American Airlines

Sat, Jan 23 - Wed, Jan 27

9:59 pm - 3:30 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

42h 31m2 stops Tampa Fort Lauderdale

6:00 am - 9:03 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 03mnonstop

$193Multiple Airlines

Mon, Oct 12 - Mon, Oct 19

11:10 am - 4:59 pmDCA Washington, D.C. Reagan-National-ORD Chicago O'Hare Intl

6h 49m1 stop New York John F Kennedy Intl

5:10 pm - 11:02 pmORD Chicago O'Hare Intl-DCA Washington, D.C. Reagan-National

4h 52m1 stop Detroit Metropolitan Wayne County

$194Delta

Tue, Sep 22 - Wed, Sep 23

12:18 pm - 4:14 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

4h 56m1 stop Detroit Metropolitan Wayne County

5:10 pm - 11:14 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

5h 04m1 stop Detroit Metropolitan Wayne County

$197Delta

Sat, Sep 19 - Mon, Sep 21

11:54 am - 1:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 36mnonstop

7:11 am - 11:18 pmORD Chicago O'Hare Intl-PHL Philadelphia

15h 07m3 stops Fort Lauderdale Tampa Atlanta Hartsfield-Jackson

$206Multiple Airlines

Mon, Oct 5 - Wed, Oct 7

Recent last minute flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

2:45 pm - 8:08 pmPHL Philadelphia-ORD Chicago O'Hare Intl

6h 23m1 stop Atlanta Hartsfield-Jackson

7:25 am - 10:49 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 24mnonstop

$193Frontier

Sat, Sep 5 - Thu, Sep 10

4:45 pm - 7:53 amPHL Philadelphia-ORD Chicago O'Hare Intl

16h 08m1 stop Atlanta Hartsfield-Jackson

7:25 am - 10:49 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 24mnonstop

$197Frontier

Sat, Sep 5 - Thu, Sep 10

9:30 am - 1:55 pmDFW Dallas/Fort Worth-ORD Chicago O'Hare Intl

4h 25m1 stop Kirksville Cannon Memorial

1:04 pm - 3:50 pmORD Chicago O'Hare Intl-DFW Dallas/Fort Worth

2h 46mnonstop

$242Multiple Airlines

Sat, Sep 5 - Sat, Sep 12

9:30 am - 1:55 pmDFW Dallas/Fort Worth-ORD Chicago O'Hare Intl

4h 25m1 stop Kirksville Cannon Memorial

1:04 pm - 3:50 pmORD Chicago O'Hare Intl-DFW Dallas/Fort Worth

2h 46mnonstop

$242Multiple Airlines

Sat, Sep 5 - Sat, Sep 12

8:00 pm - 9:58 pmJFK New York John F Kennedy Intl-ORD Chicago O'Hare Intl

2h 58mnonstop

7:00 am - 10:27 amORD Chicago O'Hare Intl-JFK New York John F Kennedy Intl

2h 27mnonstop

$277JetBlue

Sat, Sep 5 - Mon, Sep 21

2:30 pm - 4:18 pmJFK New York John F Kennedy Intl-ORD Chicago O'Hare Intl

2h 48mnonstop

7:00 am - 10:27 amORD Chicago O'Hare Intl-JFK New York John F Kennedy Intl

2h 27mnonstop

$277JetBlue

Sat, Sep 5 - Sat, Sep 26

9:30 am - 1:55 pmDFW Dallas/Fort Worth-ORD Chicago O'Hare Intl

4h 25m1 stop Kirksville Cannon Memorial

2:40 pm - 7:15 pmORD Chicago O'Hare Intl-DFW Dallas/Fort Worth

4h 35m1 stop Kirksville Cannon Memorial

$278Contour

Sat, Sep 5 - Wed, Sep 9

5:29 am - 7:15 amEWR Newark-ORD Chicago O'Hare Intl

2h 46mnonstop

10:11 am - 1:30 pmORD Chicago O'Hare Intl-EWR Newark

2h 19mnonstop

$286American Airlines

Sat, Sep 5 - Sat, Sep 26

5:19 pm - 7:20 pmEWR Newark-ORD Chicago O'Hare Intl

3h 01mnonstop

8:38 pm - 11:59 pmORD Chicago O'Hare Intl-EWR Newark

2h 21mnonstop

$286American Airlines

Sat, Sep 5 - Wed, Sep 30

9:30 am - 1:55 pmDFW Dallas/Fort Worth-ORD Chicago O'Hare Intl

4h 25m1 stop Kirksville Cannon Memorial

2:40 pm - 7:15 pmORD Chicago O'Hare Intl-DFW Dallas/Fort Worth

4h 35m1 stop Kirksville Cannon Memorial

$286Contour

Sat, Sep 5 - Wed, Sep 9

Recent direct flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

11:54 am - 1:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 36mnonstop

7:25 am - 10:49 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 24mnonstop

$166Frontier

Mon, Sep 21 - Thu, Sep 24

9:09 pm - 10:43 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 34mnonstop

4:42 pm - 7:58 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 16mnonstop

$167Frontier

Thu, Nov 12 - Sun, Nov 15

12:10 pm - 1:30 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 20mnonstop

5:55 pm - 9:02 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 07mnonstop

$177United Airlines

Wed, Sep 30 - Wed, Sep 30

5:31 pm - 6:52 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 21mnonstop

3:57 pm - 7:01 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 04mnonstop

$177United Airlines

Tue, Oct 27 - Sat, Oct 31

7:18 am - 8:50 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 32mnonstop

9:00 pm - 11:59 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

1h 59mnonstop

$177American Airlines

Sat, Nov 14 - Sat, Nov 21

11:40 am - 12:59 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

9:12 pm - 12:16 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 04mnonstop

$177American Airlines

Sat, Jan 23 - Wed, Jan 27

7:00 am - 8:48 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 48mnonstop

9:38 am - 1:06 pmORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 28mnonstop

$198JetBlue

Thu, Sep 17 - Mon, Sep 21

7:00 am - 8:48 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 48mnonstop

8:24 pm - 12:09 amORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 45mnonstop

$211JetBlue

Thu, Sep 24 - Tue, Sep 29

7:30 am - 9:24 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 54mnonstop

7:30 am - 11:01 amORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 31mnonstop

$217Delta

Thu, Oct 1 - Sat, Oct 3

4:30 pm - 6:28 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 58mnonstop

3:05 pm - 6:52 pmORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 47mnonstop

$217Delta

Thu, Sep 17 - Mon, Sep 21

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Sep 21

PHL11:54 amPhiladelphia

2h 36m

ORD1:30 pmChicago O'Hare Intl

Sep 24

ORD7:25 amChicago O'Hare Intl

2h 24m

PHL10:49 amPhiladelphia

$166

Frontier

Oct 22

PHL9:09 pmPhiladelphia

2h 30m

ORD10:39 pmChicago O'Hare Intl

Oct 25

ORD4:41 pmChicago O'Hare Intl

2h 23m

PHL8:04 pmPhiladelphia

$167

Frontier

Nov 5

PHL9:09 pmPhiladelphia

2h 34m

ORD10:43 pmChicago O'Hare Intl

Nov 6

ORD4:42 pmChicago O'Hare Intl

2h 16m

PHL7:58 pmPhiladelphia

$168

United Airlines flights from United States to Illinois

Our best United Airlines deals on United States to Illinois flight tickets

United Airlines

Sep 23

DCA11:57 amWashington, D.C. Reagan-National

2h 16m

ORD1:13 pmChicago O'Hare Intl

Sep 24

ORD5:59 amChicago O'Hare Intl

1h 55m

DCA8:54 amWashington, D.C. Reagan-National

$177

United Airlines

Oct 26

IAD8:23 amWashington, D.C. Dulles Intl

2h 22m

ORD9:45 amChicago O'Hare Intl

Oct 28

ORD9:41 pmChicago O'Hare Intl

1h 49m

IAD12:30 amWashington, D.C. Dulles Intl

$199

United Airlines

Oct 20

DCA4:30 pmWashington, D.C. Reagan-National

6h 02m

1 stop

ORD9:32 pmChicago O'Hare Intl

Oct 24

ORD11:15 amChicago O'Hare Intl

2h 08m

DCA2:23 pmWashington, D.C. Reagan-National

$208

momondo Fare Finder

Use the filters below to find and compare flights from the United States to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaChicago

PHL Philadelphia - ORD Chicago O'Hare Intl

PHLORD

Philadelphia

Mon 9/21

11:54 am-1:30 pm

Nonstop2h 36m

Chicago O'Hare Intl

Thu 9/24

7:25 am-10:49 am

Nonstop2h 24m

$166

PhiladelphiaChicago

PHL Philadelphia - ORD Chicago O'Hare Intl

PHLORD

Philadelphia

Thu 11/12

9:09 pm-10:43 pm

Nonstop2h 34m

Chicago O'Hare Intl

Sun 11/15

4:42 pm-7:58 pm

Nonstop2h 16m

$167

Washington, D.C.Chicago

IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl

IADORD

Washington, D.C. Dulles Intl

Wed 10/21

3:47 pm-5:05 pm

Nonstop2h 18m

Chicago O'Hare Intl

Thu 10/22

8:50 am-11:55 am

Nonstop2h 05m

$177

Quickest round-trip

Washington, D.C.Chicago

IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl

IADORD

Washington, D.C. Dulles Intl

Wed 9/23

3:15 pm-4:29 pm

Nonstop2h 14m

Chicago O'Hare Intl

Thu 9/24

9:52 pm-12:58 am

Nonstop2h 06m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Sat 11/14

7:18 am-8:50 am

Nonstop2h 32m

Chicago O'Hare Intl

Sat 11/21

9:00 pm-11:59 pm

Nonstop1h 59m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Sat 1/23

11:40 am-12:59 pm

Nonstop2h 19m

Chicago O'Hare Intl

Wed 1/27

9:12 pm-12:16 am

Nonstop2h 04m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Mon 10/12

9:59 pm-3:30 pm

2 stops42h 31m

Chicago O'Hare Intl

Mon 10/19

6:00 am-9:03 am

Nonstop2h 03m

$193

Washington, D.C.Chicago

DCA Washington, D.C. Reagan-National - ORD Chicago O'Hare Intl

DCAORD

Washington, D.C. Reagan-National

Tue 9/22

11:10 am-4:59 pm

1 stop6h 49m

Chicago O'Hare Intl

Wed 9/23

5:10 pm-11:02 pm

1 stop4h 52m

$194

Washington, D.C.Chicago

IAD Washington, D.C. Dulles Intl - ORD Chicago O'Hare Intl

IADORD

Washington, D.C. Dulles Intl

Sat 9/19

12:18 pm-4:14 pm

1 stop4h 56m

Chicago O'Hare Intl

Mon 9/21

5:10 pm-11:14 pm

1 stop5h 04m

$197

PhiladelphiaChicago

PHL Philadelphia - ORD Chicago O'Hare Intl

PHLORD

Philadelphia

Mon 10/5

11:54 am-1:30 pm

Nonstop2h 36m

Chicago O'Hare Intl

Wed 10/7

7:11 am-11:18 pm

3 stops15h 07m

$206

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from United States to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from United States is in January. Flight prices, which tend to average around $259, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $272.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from United States to Illinois is on a Wednesday when prices can be found for as low as $403. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $503. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from United States to Illinois during this time can be as low as $366. Flights at noon are often more expensive with an average ticket price of $515.

What is the cheapest United States to Illinois flight route?

Fly from Atlanta Hartsfield-Jackson to Chicago Midway for the best United States - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $242 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from United States for as low as $177 on momondo.

What cabin class options are available on United States to Illinois flights?

There are 4 cabin classes available to choose from on United States to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on United States to Illinois flights?

No. A direct flight is the cheapest option for a flight between United States to Illinois.

Cheap United States to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United States to Illinois

Best Price Found	$89
Fastest flight time	0h 45m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from United States in the past 72 hours is $89. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $166.

The fastest flight from United States to Illinois takes 0h 45m

Direct flights go from United States to Illinois every day.

There are 98 airports in Illinois. From United States there are direct flights to Chicago O'Hare Intl (ORD).

Search flight deals

Frequently asked questions about flying from the United States to Illinois

When did momondo last update prices for flights from United States to Illinois?
Prices for flights from United States to Illinois refresh daily.
How many operators does momondo search for flights from United States to Illinois?
As of August 2026, there are 7 operators available to choose from for flights from United States to Illinois.
How old do you have to be to fly from United States to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from United States to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from United States to Illinois?
Based on momondo bookings for flights between United States and Illinois, the leading plane model is Boeing 737-800, making up 21.14% of the total bookings. Other popular models include Airbus A321neo with 14.16%, Boeing 737-900 with 10.58%, and Boeing 737 MAX 9 with 7.57%.

Best airlines flying from United States to Illinois

Compare and see reviews for airlines that fly from United States to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $44	Free Cancellation	Rating 5.6 2,630 reviews	Search Frontier flights
JetBlue	PriceFrom $72	Free Cancellation	Rating 7.1 3,034 reviews	Search JetBlue flights
Delta	PriceFrom $74	Free Cancellation	Rating 7.8 8,536 reviews	Search Delta flights
Contour	PriceFrom $105	Free Cancellation	Rating 7.5 43 reviews	Search Contour flights
Allegiant Air	PriceFrom $110	Free Cancellation	Rating 7.3 676 reviews	Search Allegiant Air flights
Breeze Airways	PriceFrom $128	Free Cancellation	Rating 8.2 317 reviews	Search Breeze Airways flights
United Airlines	PriceFrom $130	Free Cancellation	Rating 7.4 10,152 reviews	Search United Airlines flights
Southwest	PriceFrom $137	Free Cancellation	Rating 8.0 4,194 reviews	Search Southwest flights
American Airlines	PriceFrom $140	Free Cancellation	Rating 7.1 12,026 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $204	Free Cancellation	Rating 7.9 12,864 reviews	Search Alaska Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from United States to Illinois?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Illinois from United States.

Can I find flights from United States to Illinois with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for United States to Illinois flights to just show those with flexible booking policies.

How can momondo help me find flights from United States to Illinois?

momondo provides multiple filters to help you find the best flight to Illinois from United States. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from United States to Illinois right now. Can momondo alert me if prices change?

Price alerts on flights to Illinois from United States are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Wed 9/30

Wed 10/7

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Illinois

Popular cities

Other flights from the United States

Other flights to Illinois

Airlines

Complete your trip

Feeling lucky

Popular cities in Illinois

Flights to New Yorkfrom $70

Flights to Los Angelesfrom $44

Flights to Orlandofrom $58

Flights to Miamifrom $74

Flights to San Franciscofrom $38

Flights to Chicagofrom $50

Flights to Las Vegasfrom $45

Flights to Washington, D.C.from $57

Flights to Bostonfrom $80

Flights to Fort Lauderdalefrom $50

Flights to Atlantafrom $43

Flights to Dallasfrom $53

Cheap flights from the United States to Illinois from $89

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to Illinois departing on 9/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from the United States to Illinois

Recent round-trip flight deals from the United States to Illinois

Recent one-way flight deals from the United States to Illinois

Recent last minute flight deals from the United States to Illinois

Recent direct flight deals from the United States to Illinois

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

United Airlines flights from United States to Illinois

Our best United Airlines deals on United States to Illinois flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from the United States to Illinois that are best for you.

See travel insights to Illinois from

How to get the cheapest flight ticket from United States to Illinois

What is the cheapest month to fly to Illinois?

What is the cheapest day to depart on your flight to Illinois?

What is the cheapest time of day to depart on your flight to Illinois?

What is the cheapest United States to Illinois flight route?

How far in advance should I book a flight to Illinois?

What cabin class options are available on United States to Illinois flights?

Can stopping save me money on United States to Illinois flights?

What is the cheapest airline that flies from United States to Illinois?

What airlines fly to Illinois?

How many flights depart from United States to Illinois on average per day?

How many flights depart from United States to Illinois on average per week?

How long is the flight from United States to Illinois?

Cheap United States to Illinois flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

Frequently asked questions about flying from the United States to Illinois

Best airlines flying from United States to Illinois

Compare and see reviews for airlines that fly from United States to Illinois with momondo

Why use momondo?

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo

United States flight routes

According to popular flight searches on momondo this year

Illinois flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Illinois

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Complete your trip to Illinois

Explore popular destinations other users love

According to popular flight searches on momondo this year