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

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

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

The number of flights available between United States and Illinois is 2,659 per week as of September 2026. The most frequent departure day is Mon, with 23% of weekly flights leaving on this day.

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 38% 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 day?

As of September 2026, 379 flights take off from United States and land in Illinois each day. The most common flight departure time for this route is 10:00AM, with 41% of daily flights taking off at noon.

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 46m 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 47m.

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 September 2026, there are 8 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 2026/27

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.

9:58 am - 11:21 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 23mnonstop

6:00 am - 8:57 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

1h 57mnonstop

$177Frontier

Fri, Oct 23 - Thu, Oct 29

9:58 am - 11:21 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 23mnonstop

8:04 am - 1:01 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

27h 57m1 stop Fort Lauderdale

$177Frontier

Thu, Oct 22 - Mon, Oct 26

6:05 am - 10:29 amIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

5h 24m1 stop Detroit Metropolitan Wayne County

5:29 pm - 11:16 pmORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

4h 47m1 stop Detroit Metropolitan Wayne County

$179Delta

Wed, Oct 28 - Wed, Oct 28

12:30 pm - 5:20 pmIAD Washington, D.C. Dulles Intl-ORD Chicago O'Hare Intl

5h 50m1 stop New York John F Kennedy Intl

6:10 am - 11:50 amORD Chicago O'Hare Intl-IAD Washington, D.C. Dulles Intl

4h 40m1 stop New York John F Kennedy Intl

$179Delta

Sat, Oct 24 - Sat, Oct 31

12:21 am - 6:34 amLAX Los Angeles Los Angeles-ORD Chicago O'Hare Intl

4h 13mnonstop

9:00 am - 5:03 pmORD Chicago O'Hare Intl-LAX Los Angeles Los Angeles

10h 03m1 stop Seattle/Tacoma Intl

$199Multiple Airlines

Fri, Oct 16 - Sat, Oct 24

5:30 am - 10:38 amDFW Dallas/Fort Worth-ORD Chicago O'Hare Intl

5h 08m1 stop Minneapolis St Paul

12:37 pm - 3:20 pmORD Chicago O'Hare Intl-DFW Dallas/Fort Worth

2h 43mnonstop

$201Multiple Airlines

Mon, Oct 12 - Wed, Oct 21

6:10 am - 7:31 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 21mnonstop

11:00 am - 2:06 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 06mnonstop

$202United Airlines

Tue, Nov 17 - Tue, Nov 17

11:55 am - 1:15 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 20mnonstop

3:00 pm - 6:13 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 13mnonstop

$205United Airlines

Tue, Oct 6 - Wed, Oct 7

6:55 am - 8:47 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 52mnonstop

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

2h 28mnonstop

$214JetBlue

Thu, Oct 15 - Mon, Oct 19

11:59 pm - 11:24 amLAX Los Angeles Los Angeles-ORD Chicago O'Hare Intl

9h 25m1 stop New York John F Kennedy Intl

7:00 am - 2:50 pmORD Chicago O'Hare Intl-LAX Los Angeles Los Angeles

9h 50m1 stop Fort Lauderdale

$215JetBlue

Mon, Oct 19 - Wed, Oct 28

Recent last minute flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

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

4h 25m1 stop Kirksville Cannon Memorial

12:37 pm - 3:20 pmORD Chicago O'Hare Intl-DFW Dallas/Fort Worth

2h 43mnonstop

$220Multiple Airlines

Fri, Sep 25 - Tue, Oct 20

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

4h 25m1 stop Kirksville Cannon Memorial

8:13 pm - 11:10 pmORD Chicago O'Hare Intl-DFW Dallas/Fort Worth

2h 57mnonstop

$231Multiple Airlines

Mon, Sep 28 - Tue, Nov 17

5:03 pm - 6:27 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 24mnonstop

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

2h 03mnonstop

$243Frontier

Sat, Sep 26 - Mon, Oct 26

5:03 pm - 6:27 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 24mnonstop

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

2h 03mnonstop

$243Frontier

Sat, Sep 26 - Thu, Oct 22

8:10 am - 9:58 amJFK New York John F Kennedy Intl-ORD Chicago O'Hare Intl

2h 48mnonstop

10:59 am - 2:20 pmORD Chicago O'Hare Intl-JFK New York John F Kennedy Intl

2h 21mnonstop

$245JetBlue

Mon, Sep 28 - Wed, Oct 7

8:27 pm - 10:11 pmLGA New York LaGuardia-ORD Chicago O'Hare Intl

2h 44mnonstop

6:00 am - 9:15 amORD Chicago O'Hare Intl-LGA New York LaGuardia

2h 15mnonstop

$254United Airlines

Mon, Sep 28 - Wed, Oct 7

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

$269Contour

Fri, Sep 25 - Mon, Sep 28

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

$275Contour

Sat, Sep 26 - Wed, Sep 30

5:15 am - 9:58 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

5h 43m1 stop New York John F Kennedy Intl

10:59 am - 5:24 pmORD Chicago O'Hare Intl-BOS Boston Logan Intl

5h 25m1 stop New York John F Kennedy Intl

$293JetBlue

Mon, Sep 28 - Tue, Oct 6

7:23 am - 9:00 amLGA New York LaGuardia-ORD Chicago O'Hare Intl

2h 37mnonstop

3:00 pm - 6:25 pmORD Chicago O'Hare Intl-LGA New York LaGuardia

2h 25mnonstop

$294United Airlines

Mon, Sep 28 - Mon, Oct 5

Recent direct flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

9:58 am - 11:21 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 23mnonstop

6:00 am - 8:57 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

1h 57mnonstop

$177Frontier

Fri, Oct 23 - Thu, Oct 29

9:58 am - 11:21 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 23mnonstop

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

2h 03mnonstop

$178Frontier

Thu, Oct 8 - Mon, Oct 12

6:10 am - 7:31 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 21mnonstop

11:00 am - 2:06 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 06mnonstop

$202United Airlines

Tue, Nov 17 - Tue, Nov 17

11:55 am - 1:15 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 20mnonstop

3:00 pm - 6:13 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 13mnonstop

$205United Airlines

Tue, Oct 6 - Wed, Oct 7

6:55 am - 8:47 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 52mnonstop

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

2h 28mnonstop

$214JetBlue

Thu, Oct 15 - Mon, Oct 19

3:21 pm - 5:36 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

3h 15mnonstop

3:16 pm - 6:49 pmORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 33mnonstop

$215American Airlines

Sat, Nov 7 - Mon, Nov 9

8:16 am - 10:30 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

3h 14mnonstop

12:06 pm - 3:36 pmORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 30mnonstop

$215American Airlines

Sat, Nov 7 - Mon, Nov 9

4:25 pm - 6:20 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 55mnonstop

7:25 am - 11:00 amORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 35mnonstop

$215Delta

Thu, Oct 15 - Mon, Oct 19

6:55 am - 8:47 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 52mnonstop

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

2h 28mnonstop

$215JetBlue

Thu, Oct 15 - Mon, Oct 19

1:35 pm - 3:26 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 51mnonstop

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

2h 47mnonstop

$216Delta

Sat, Oct 3 - Mon, Oct 5

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JetBlue flights from United States to Illinois

Our best JetBlue deals on United States to Illinois flight tickets

JetBlue

Oct 15

BOS6:55 amBoston Logan Intl

2h 52m

ORD8:47 amChicago O'Hare Intl

Oct 19

ORD9:38 amChicago O'Hare Intl

2h 28m

BOS1:06 pmBoston Logan Intl

$214

JetBlue

Oct 3

BOS4:11 pmBoston Logan Intl

6h 57m

1 stop

ORD10:08 pmChicago O'Hare Intl

Oct 5

ORD8:24 pmChicago O'Hare Intl

2h 59m

BOS12:23 amBoston Logan Intl

$216

JetBlue

Oct 3

BOS4:11 pmBoston Logan Intl

6h 57m

1 stop

ORD10:08 pmChicago O'Hare Intl

Oct 5

ORD8:24 pmChicago O'Hare Intl

2h 59m

BOS12:23 amBoston Logan Intl

$217

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Oct 9

BWI9:58 amBaltimore/Washington

2h 23m

ORD11:21 amChicago O'Hare Intl

Oct 10

ORD6:00 amChicago O'Hare Intl

11h 30m

1 stop

BWI6:30 pmBaltimore/Washington

$177

Frontier

Oct 8

BWI9:58 amBaltimore/Washington

2h 23m

ORD11:21 amChicago O'Hare Intl

Oct 13

ORD8:04 amChicago O'Hare Intl

27h 57m

1 stop

BWI1:01 pmBaltimore/Washington

$178

Frontier

Oct 12

BWI9:58 amBaltimore/Washington

2h 23m

ORD11:21 amChicago O'Hare Intl

Oct 15

ORD6:00 amChicago O'Hare Intl

2h 03m

BWI9:03 amBaltimore/Washington

$179

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

Quickest round-trip

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Fri 10/23

9:58 am-11:21 am

Nonstop2h 23m

Chicago O'Hare Intl

Thu 10/29

6:00 am-8:57 am

Nonstop1h 57m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Thu 10/22

9:58 am-11:21 am

Nonstop2h 23m

Chicago O'Hare Intl

Mon 10/26

8:04 am-1:01 pm

1 stop27h 57m

$177

Washington, D.C.Chicago

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

IADORD

Washington, D.C. Dulles Intl

Wed 10/28

6:05 am-10:29 am

1 stop5h 24m

Chicago O'Hare Intl

Wed 10/28

5:29 pm-11:16 pm

1 stop4h 47m

$179

Washington, D.C.Chicago

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

IADORD

Washington, D.C. Dulles Intl

Sat 10/24

12:30 pm-5:20 pm

1 stop5h 50m

Chicago O'Hare Intl

Sat 10/31

6:10 am-11:50 am

1 stop4h 40m

$179

Los AngelesChicago

LAX Los Angeles Los Angeles - ORD Chicago O'Hare Intl

LAXORD

Los Angeles Los Angeles

Fri 10/16

12:21 am-6:34 am

Nonstop4h 13m

Chicago O'Hare Intl

Sat 10/24

9:00 am-5:03 pm

1 stop10h 03m

$199

DallasChicago

DFW Dallas/Fort Worth - ORD Chicago O'Hare Intl

DFWORD

Dallas/Fort Worth

Mon 10/12

5:30 am-10:38 am

1 stop5h 08m

Chicago O'Hare Intl

Wed 10/21

12:37 pm-3:20 pm

Nonstop2h 43m

$201

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Tue 11/17

6:10 am-7:31 am

Nonstop2h 21m

Chicago O'Hare Intl

Tue 11/17

11:00 am-2:06 pm

Nonstop2h 06m

$202

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Tue 10/6

11:55 am-1:15 pm

Nonstop2h 20m

Chicago O'Hare Intl

Wed 10/7

3:00 pm-6:13 pm

Nonstop2h 13m

$205

BostonChicago

BOS Boston Logan Intl - ORD Chicago O'Hare Intl

BOSORD

Boston Logan Intl

Thu 10/15

6:55 am-8:47 am

Nonstop2h 52m

Chicago O'Hare Intl

Mon 10/19

9:38 am-1:06 pm

Nonstop2h 28m

$214

Los AngelesChicago

LAX Los Angeles Los Angeles - ORD Chicago O'Hare Intl

LAXORD

Los Angeles Los Angeles

Mon 10/19

11:59 pm-11:24 am

1 stop9h 25m

Chicago O'Hare Intl

Wed 10/28

7:00 am-2:50 pm

1 stop9h 50m

$215

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 $261, 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 $273.

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 $405. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $505. 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 $369. Flights at noon are often more expensive with an average ticket price of $521.

What is the cheapest United States to Illinois flight route?

Fly from Newark 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 $244 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 50m
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 $177.

The fastest flight from United States to Illinois takes 0h 50m

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 September 2026, there are 8 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 20.79% of the total bookings. Other popular models include Airbus A321neo with 14.45%, Boeing 737-900 with 10.77%, and Boeing 737 MAX 9 with 7.95%.

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 2,583 reviews	Search Frontier flights
JetBlue	PriceFrom $72	Free Cancellation	Rating 7.1 3,037 reviews	Search JetBlue flights
Delta	PriceFrom $74	Free Cancellation	Rating 7.8 8,596 reviews	Search Delta flights
Contour	PriceFrom $105	Free Cancellation	Rating 7.5 43 reviews	Search Contour flights
Allegiant Air	PriceFrom $118	Free Cancellation	Rating 7.3 678 reviews	Search Allegiant Air flights
Breeze Airways	PriceFrom $122	Free Cancellation	Rating 8.2 325 reviews	Search Breeze Airways flights
United Airlines	PriceFrom $134	Free Cancellation	Rating 7.4 10,228 reviews	Search United Airlines flights
Southwest	PriceFrom $144	Free Cancellation	Rating 8.0 4,196 reviews	Search Southwest flights
American Airlines	PriceFrom $146	Free Cancellation	Rating 7.0 12,079 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $204	Free Cancellation	Rating 7.9 12,953 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.

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Find better results for your trip to Illinois

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Complete your trip

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Popular cities in Illinois

Flights to New Yorkfrom $69

Flights to Los Angelesfrom $38

Flights to Orlandofrom $48

Flights to Miamifrom $50

Flights to San Franciscofrom $43

Flights to Chicagofrom $50

Flights to Las Vegasfrom $50

Flights to Washington, D.C.from $38

Flights to Fort Lauderdalefrom $38

Flights to Bostonfrom $106

Flights to Atlantafrom $38

Flights to Dallasfrom $59

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 10/24. 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

JetBlue flights from United States to Illinois

Our best JetBlue deals on United States to Illinois flight tickets

Frontier flights from United States to Illinois

Our best Frontier 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