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

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

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

As of August 2026, 611 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 40% of daily flights taking off at noon.

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 12 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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 Boston (a popular airport in United States) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 2h 42m on average. If you fly from New York (another popular airport in United States) to Chicago O'Hare Intl Airport, then the average flight time is 2h 47m.

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

The number of flights available between United States and Illinois is 4,282 per week as of August 2026. The most frequent departure day is Thu, with 17% of weekly flights leaving on this day.

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 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.

$69 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

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One-way

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Direct

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

Enter your travel dates to find the best prices.

5:10 pm - 6:31 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 21mnonstop

10:26 am - 1:34 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 08mnonstop

$138Frontier

Tue, Oct 20 - Thu, Oct 22

5:02 pm - 6:23 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 21mnonstop

10:26 am - 1:34 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 08mnonstop

$138Frontier

Wed, Oct 7 - Sun, Oct 11

5:02 pm - 6:23 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 21mnonstop

7:11 am - 7:54 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

11h 43m2 stops Fort Lauderdale Tampa

$149Multiple Airlines

Sat, Sep 26 - Wed, Sep 30

5:02 pm - 6:23 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 21mnonstop

7:11 am - 7:54 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

11h 43m2 stops Fort Lauderdale Tampa

$152Multiple Airlines

Sat, Sep 26 - Wed, Sep 30

7:05 pm - 8:24 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

7:30 am - 10:30 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 00mnonstop

$177United Airlines

Mon, Oct 19 - Tue, Oct 20

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, Oct 14 - Sat, Oct 17

6:16 pm - 8:03 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 47mnonstop

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

2h 04mnonstop

$177American Airlines

Sat, Oct 3 - Sat, Oct 10

7:17 am - 8:45 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 28mnonstop

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

2h 04mnonstop

$177American Airlines

Sat, Oct 24 - Sat, Oct 31

6:20 am - 10:28 amDCA Washington, D.C. Reagan-National-ORD Chicago O'Hare Intl

5h 08m1 stop New York LaGuardia

11:17 am - 5:29 pmORD Chicago O'Hare Intl-DCA Washington, D.C. Reagan-National

5h 12m1 stop Detroit Metropolitan Wayne County

$197Delta

Thu, Oct 1 - Sat, Oct 3

12:26 pm - 4:37 pmDCA Washington, D.C. Reagan-National-ORD Chicago O'Hare Intl

5h 11m1 stop Atlanta Hartsfield-Jackson

11:17 am - 5:29 pmORD Chicago O'Hare Intl-DCA Washington, D.C. Reagan-National

5h 12m1 stop Detroit Metropolitan Wayne County

$197Delta

Sat, Sep 12 - Sat, Sep 19

Recent last minute flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

6:35 am - 7:53 amATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 18mnonstop

1:59 pm - 5:21 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 22mnonstop

$165Frontier

Wed, Aug 26 - Sat, Sep 5

6:38 pm - 8:08 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 30mnonstop

7:05 am - 10:30 amORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 25mnonstop

$170Frontier

Sat, Aug 22 - Sun, Sep 6

11:41 pm - 5:59 amLAX Los Angeles-ORD Chicago O'Hare Intl

4h 18mnonstop

3:43 pm - 10:59 pmORD Chicago O'Hare Intl-LAX Los Angeles

9h 16m1 stop Seattle/Tacoma Intl

$233Multiple Airlines

Wed, Aug 26 - Tue, Sep 1

11:59 pm - 6:17 amLAX Los Angeles-ORD Chicago O'Hare Intl

4h 18mnonstop

3:43 pm - 10:59 pmORD Chicago O'Hare Intl-LAX Los Angeles

9h 16m1 stop Seattle/Tacoma Intl

$238Multiple Airlines

Tue, Aug 25 - Tue, Sep 1

8:27 am - 2:54 pmLAX Los Angeles-ORD Chicago O'Hare Intl

4h 27mnonstop

1:50 pm - 4:15 pmORD Chicago O'Hare Intl-LAX Los Angeles

4h 25mnonstop

$248American Airlines

Tue, Aug 25 - Wed, Sep 30

3:40 pm - 5:35 pmJFK New York John F Kennedy Intl-ORD Chicago O'Hare Intl

2h 55mnonstop

6:00 am - 9:17 amORD Chicago O'Hare Intl-JFK New York John F Kennedy Intl

2h 17mnonstop

$258JetBlue

Wed, Aug 26 - Wed, Sep 2

3:40 pm - 5:35 pmJFK New York John F Kennedy Intl-ORD Chicago O'Hare Intl

2h 55mnonstop

6:00 am - 9:17 amORD Chicago O'Hare Intl-JFK New York John F Kennedy Intl

2h 17mnonstop

$261JetBlue

Wed, Aug 26 - Wed, Sep 2

10:42 am - 12:26 pmEWR Newark-ORD Chicago O'Hare Intl

2h 44mnonstop

8:36 pm - 11:59 pmORD Chicago O'Hare Intl-EWR Newark

2h 23mnonstop

$262American Airlines

Tue, Aug 25 - Tue, Sep 1

7:29 pm - 9:13 pmLGA New York LaGuardia-ORD Chicago O'Hare Intl

2h 44mnonstop

1:00 pm - 4:19 pmORD Chicago O'Hare Intl-LGA New York LaGuardia

2h 19mnonstop

$266United Airlines

Sat, Aug 22 - Thu, Oct 15

2:15 pm - 8:33 pmLAX Los Angeles-ORD Chicago O'Hare Intl

4h 18mnonstop

7:00 am - 9:32 amORD Chicago O'Hare Intl-LAX Los Angeles

4h 32mnonstop

$277United Airlines

Wed, Aug 26 - Sun, Sep 13

Recent direct flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

5:10 pm - 6:31 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 21mnonstop

10:26 am - 1:34 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 08mnonstop

$138Frontier

Tue, Oct 20 - Thu, Oct 22

5:02 pm - 6:23 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 21mnonstop

10:26 am - 1:34 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 08mnonstop

$138Frontier

Wed, Oct 7 - Sun, Oct 11

7:05 pm - 8:24 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

7:30 am - 10:30 amORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 00mnonstop

$177United Airlines

Mon, Oct 19 - Tue, Oct 20

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, Oct 14 - Sat, Oct 17

6:16 pm - 8:03 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 47mnonstop

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

2h 04mnonstop

$177American Airlines

Sat, Oct 3 - Sat, Oct 10

7:17 am - 8:45 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 28mnonstop

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

2h 04mnonstop

$177American Airlines

Sat, Oct 24 - Sat, Oct 31

5:52 pm - 11:47 pmLAX Los Angeles-ORD Chicago O'Hare Intl

3h 55mnonstop

7:20 am - 9:55 amORD Chicago O'Hare Intl-LAX Los Angeles

4h 35mnonstop

$199Delta

Thu, Oct 8 - Wed, Oct 14

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

$214JetBlue

Wed, Sep 16 - Sat, Sep 19

5:00 pm - 7:22 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

3h 22mnonstop

8:24 pm - 11:58 pmORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 34mnonstop

$214JetBlue

Mon, Oct 12 - Wed, Oct 14

7:40 am - 1:44 pmLAX Los Angeles-ORD Chicago O'Hare Intl

4h 04mnonstop

6:59 pm - 9:34 pmORD Chicago O'Hare Intl-LAX Los Angeles

4h 35mnonstop

$217Delta

Wed, Sep 30 - Sun, Oct 4

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Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Oct 7

ATL5:02 pmAtlanta Hartsfield-Jackson

2h 21m

ORD6:23 pmChicago O'Hare Intl

Oct 11

ORD10:26 amChicago O'Hare Intl

2h 08m

ATL1:34 pmAtlanta Hartsfield-Jackson

$138

Frontier

Sep 30

ATL7:30 pmAtlanta Hartsfield-Jackson

17h 10m

1 stop

ORD11:40 amChicago O'Hare Intl

Oct 5

ORD6:20 amChicago O'Hare Intl

29h 08m

1 stop

ATL12:28 pmAtlanta Hartsfield-Jackson

$139

Frontier

Sep 10

ATL8:00 amAtlanta Hartsfield-Jackson

2h 20m

ORD9:20 amChicago O'Hare Intl

Sep 17

ORD7:28 pmChicago O'Hare Intl

2h 16m

ATL10:44 pmAtlanta Hartsfield-Jackson

$140

American Airlines flights from United States to Illinois

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

American Airlines

Sep 17

DCA6:30 amWashington, D.C. Reagan-National

2h 28m

ORD7:58 amChicago O'Hare Intl

Sep 24

ORD6:55 pmChicago O'Hare Intl

2h 05m

DCA10:00 pmWashington, D.C. Reagan-National

$182

American Airlines

Oct 1

DCA3:58 pmWashington, D.C. Reagan-National

2h 30m

ORD5:28 pmChicago O'Hare Intl

Oct 5

ORD6:55 pmChicago O'Hare Intl

2h 05m

DCA10:00 pmWashington, D.C. Reagan-National

$198

American Airlines

Oct 10

BWI7:17 amBaltimore/Washington

2h 28m

ORD8:45 amChicago O'Hare Intl

Oct 12

ORD9:12 pmChicago O'Hare Intl

2h 04m

BWI12:16 amBaltimore/Washington

$219

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

AtlantaChicago

ATL Atlanta Hartsfield-Jackson - ORD Chicago O'Hare Intl

ATLORD

Atlanta Hartsfield-Jackson

Tue 10/20

5:10 pm-6:31 pm

Nonstop2h 21m

Chicago O'Hare Intl

Thu 10/22

10:26 am-1:34 pm

Nonstop2h 08m

$138

AtlantaChicago

ATL Atlanta Hartsfield-Jackson - ORD Chicago O'Hare Intl

ATLORD

Atlanta Hartsfield-Jackson

Wed 10/7

5:02 pm-6:23 pm

Nonstop2h 21m

Chicago O'Hare Intl

Sun 10/11

10:26 am-1:34 pm

Nonstop2h 08m

$138

AtlantaChicago

ATL Atlanta Hartsfield-Jackson - ORD Chicago O'Hare Intl

ATLORD

Atlanta Hartsfield-Jackson

Sat 9/26

5:02 pm-6:23 pm

Nonstop2h 21m

Chicago O'Hare Intl

Wed 9/30

7:11 am-7:54 pm

2 stops11h 43m

$149

AtlantaChicago

ATL Atlanta Hartsfield-Jackson - ORD Chicago O'Hare Intl

ATLORD

Atlanta Hartsfield-Jackson

Sat 9/26

5:02 pm-6:23 pm

Nonstop2h 21m

Chicago O'Hare Intl

Wed 9/30

7:11 am-7:54 pm

2 stops11h 43m

$152

Quickest round-trip

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Mon 10/19

7:05 pm-8:24 pm

Nonstop2h 19m

Chicago O'Hare Intl

Tue 10/20

7:30 am-10:30 am

Nonstop2h 00m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Wed 10/14

12:10 pm-1:30 pm

Nonstop2h 20m

Chicago O'Hare Intl

Sat 10/17

5:55 pm-9:02 pm

Nonstop2h 07m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Sat 10/3

6:16 pm-8:03 pm

Nonstop2h 47m

Chicago O'Hare Intl

Sat 10/10

9:12 pm-12:16 am

Nonstop2h 04m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Sat 10/24

7:17 am-8:45 am

Nonstop2h 28m

Chicago O'Hare Intl

Sat 10/31

9:12 pm-12:16 am

Nonstop2h 04m

$177

Washington, D.C.Chicago

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

DCAORD

Washington, D.C. Reagan-National

Thu 10/1

6:20 am-10:28 am

1 stop5h 08m

Chicago O'Hare Intl

Sat 10/3

11:17 am-5:29 pm

1 stop5h 12m

$197

Washington, D.C.Chicago

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

DCAORD

Washington, D.C. Reagan-National

Sat 9/12

12:26 pm-4:37 pm

1 stop5h 11m

Chicago O'Hare Intl

Sat 9/19

11:17 am-5:29 pm

1 stop5h 12m

$197

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 $271.

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 $501. 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 $359. 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 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 $241 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 $174 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	$69
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 $69. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $138.

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 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 22.04% of the total bookings. Other popular models include Airbus A321neo with 14.14%, Boeing 737-900 with 10.50%, and Boeing 737 MAX 8 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 2,658 reviews	Search Frontier flights
JetBlue	PriceFrom $70	Free Cancellation	Rating 7.1 3,039 reviews	Search JetBlue flights
Delta	PriceFrom $74	Free Cancellation	Rating 7.8 8,520 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
United Airlines	PriceFrom $127	Free Cancellation	Rating 7.4 10,110 reviews	Search United Airlines flights
Breeze Airways	PriceFrom $128	Free Cancellation	Rating 8.2 311 reviews	Search Breeze Airways flights
Southwest	PriceFrom $137	Free Cancellation	Rating 8.0 4,214 reviews	Search Southwest flights
American Airlines	PriceFrom $137	Free Cancellation	Rating 7.1 11,989 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $195	Free Cancellation	Rating 7.9 12,833 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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Complete your trip

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Popular cities in Illinois

Flights to New Yorkfrom $50

Flights to Los Angelesfrom $46

Flights to Orlandofrom $53

Flights to Miamifrom $56

Flights to San Franciscofrom $46

Flights to Chicagofrom $51

Flights to Las Vegasfrom $46

Flights to Washington, D.C.from $58

Flights to Bostonfrom $65

Flights to Atlantafrom $53

Flights to Fort Lauderdalefrom $50

Flights to Dallasfrom $50

Cheap flights from the United States to Illinois from $69

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 11/19. 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

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Big names and deals

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Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

American Airlines flights from United States to Illinois

Our best American 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

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