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 3,085 per week as of August 2026. The most frequent departure day is Mon, with 21% of weekly flights leaving on this day.

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

As of August 2026, 440 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 46m.

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.

$73 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.

8:00 am - 9:20 amATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 20mnonstop

7:28 pm - 10:44 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 16mnonstop

$138Frontier

Thu, Sep 10 - Mon, Sep 14

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

Mon, Oct 19 - Sun, Oct 25

6:10 am - 7:29 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

6:29 pm - 9:42 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 13mnonstop

$177United Airlines

Wed, Oct 28 - Sat, Oct 31

7:10 pm - 8:29 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

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

2h 13mnonstop

$177United Airlines

Mon, Oct 19 - Wed, Oct 21

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

Thu, Oct 8 - Tue, Oct 13

6:16 pm - 8:04 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 48mnonstop

9:00 pm - 11:58 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

1h 58mnonstop

$177American Airlines

Tue, Nov 10 - Thu, Nov 26

7:20 am - 3:20 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

9h 00m1 stop Fort Lauderdale

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

11h 43m2 stops Fort Lauderdale Tampa

$179Multiple Airlines

Tue, Sep 15 - Wed, Sep 16

7:20 am - 3:20 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

9h 00m1 stop Fort Lauderdale

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

11h 43m2 stops Fort Lauderdale Tampa

$181Multiple Airlines

Wed, Sep 30 - Wed, Oct 7

6:55 am - 11:24 amBOS Boston Logan Intl-ORD Chicago O'Hare Intl

5h 29m1 stop New York John F Kennedy Intl

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

2h 28mnonstop

$193JetBlue

Sun, Oct 18 - Thu, Oct 22

5:00 pm - 7:01 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

3h 01mnonstop

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

2h 45mnonstop

$197JetBlue

Thu, Sep 17 - Mon, Sep 21

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

$145Frontier

Sat, Aug 29 - Sat, Sep 5

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

$145Frontier

Sat, Aug 29 - Sat, Sep 5

6:29 pm - 7:59 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 30mnonstop

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

11h 43m2 stops Fort Lauderdale Tampa

$245Multiple Airlines

Thu, Aug 27 - Wed, Sep 16

7:00 am - 8:46 amJFK New York John F Kennedy Intl-ORD Chicago O'Hare Intl

2h 46mnonstop

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

2h 27mnonstop

$257JetBlue

Thu, Aug 27 - Mon, Sep 28

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

2h 55mnonstop

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

2h 21mnonstop

$264JetBlue

Wed, Aug 26 - Wed, Sep 30

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

2h 18mnonstop

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

11h 43m2 stops Fort Lauderdale Tampa

$264Multiple Airlines

Sat, Aug 29 - Wed, Sep 9

2:59 pm - 4:58 pmJFK New York John F Kennedy Intl-ORD Chicago O'Hare Intl

2h 59mnonstop

4:01 pm - 7:29 pmORD Chicago O'Hare Intl-JFK New York John F Kennedy Intl

2h 28mnonstop

$266American Airlines

Wed, Aug 26 - Mon, Sep 28

5:25 pm - 7:29 pmLGA New York LaGuardia-ORD Chicago O'Hare Intl

3h 04mnonstop

12:47 pm - 4:04 pmORD Chicago O'Hare Intl-LGA New York LaGuardia

2h 17mnonstop

$266American Airlines

Wed, Aug 26 - Wed, Sep 30

2:30 pm - 4:15 pmLGA New York LaGuardia-ORD Chicago O'Hare Intl

2h 45mnonstop

7:00 am - 10:15 amORD Chicago O'Hare Intl-LGA New York LaGuardia

2h 15mnonstop

$272Delta

Sat, Aug 29 - Wed, Sep 23

2:30 pm - 4:15 pmLGA New York LaGuardia-ORD Chicago O'Hare Intl

2h 45mnonstop

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

2h 15mnonstop

$272Delta

Sat, Aug 29 - Mon, Sep 21

Recent direct flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

8:00 am - 9:20 amATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 20mnonstop

7:28 pm - 10:44 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 16mnonstop

$138Frontier

Thu, Sep 10 - Mon, Sep 14

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

Mon, Oct 19 - Sun, Oct 25

6:10 am - 7:29 amBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

6:29 pm - 9:42 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

2h 13mnonstop

$177United Airlines

Wed, Oct 28 - Sat, Oct 31

7:10 pm - 8:29 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 19mnonstop

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

2h 13mnonstop

$177United Airlines

Mon, Oct 19 - Wed, Oct 21

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

Thu, Oct 8 - Tue, Oct 13

6:16 pm - 8:04 pmBWI Baltimore/Washington-ORD Chicago O'Hare Intl

2h 48mnonstop

9:00 pm - 11:58 pmORD Chicago O'Hare Intl-BWI Baltimore/Washington

1h 58mnonstop

$177American Airlines

Tue, Nov 10 - Thu, Nov 26

5:00 pm - 7:01 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

3h 01mnonstop

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

2h 45mnonstop

$197JetBlue

Thu, Sep 17 - Mon, Sep 21

5:00 pm - 7:01 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

3h 01mnonstop

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

2h 28mnonstop

$208JetBlue

Tue, Sep 15 - Sat, Sep 19

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

7:40 pm - 9:31 pmBOS Boston Logan Intl-ORD Chicago O'Hare Intl

2h 51mnonstop

3:05 pm - 6:44 pmORD Chicago O'Hare Intl-BOS Boston Logan Intl

2h 39mnonstop

$217Delta

Thu, Oct 15 - Tue, Oct 20

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JetBlue flights from United States to Illinois

Our best JetBlue deals on United States to Illinois flight tickets

JetBlue

Sep 19

BOS7:00 amBoston Logan Intl

2h 48m

ORD8:48 amChicago O'Hare Intl

Sep 21

ORD8:24 pmChicago O'Hare Intl

2h 45m

BOS12:09 amBoston Logan Intl

$209

JetBlue

Sep 23

BOS5:00 pmBoston Logan Intl

3h 01m

ORD7:01 pmChicago O'Hare Intl

Sep 30

ORD9:38 amChicago O'Hare Intl

2h 28m

BOS1:06 pmBoston Logan Intl

$214

JetBlue

Sep 17

BOS7:00 amBoston Logan Intl

2h 48m

ORD8:48 amChicago O'Hare Intl

Sep 21

ORD8:24 pmChicago O'Hare Intl

2h 45m

BOS12:09 amBoston Logan Intl

$215

American Airlines flights from United States to Illinois

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

American Airlines

Sep 17

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

2h 30m

ORD5:28 pmChicago O'Hare Intl

Sep 21

ORD8:55 pmChicago O'Hare Intl

2h 04m

DCA11:59 pmWashington, D.C. Reagan-National

$178

American Airlines

Oct 10

DCA6:33 pmWashington, D.C. Reagan-National

2h 33m

ORD8:06 pmChicago O'Hare Intl

Oct 15

ORD1:20 pmChicago O'Hare Intl

2h 09m

DCA4:29 pmWashington, D.C. Reagan-National

$217

American Airlines

Sep 27

JFK4:30 pmNew York John F Kennedy Intl

6h 17m

1 stop

ORD9:47 pmChicago O'Hare Intl

Oct 1

ORD7:46 amChicago O'Hare Intl

2h 34m

JFK11:20 amNew York John F Kennedy Intl

$221

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

AtlantaChicago

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

ATLORD

Atlanta Hartsfield-Jackson

Thu 9/10

8:00 am-9:20 am

Nonstop2h 20m

Chicago O'Hare Intl

Mon 9/14

7:28 pm-10:44 pm

Nonstop2h 16m

$138

Quickest round-trip

AtlantaChicago

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

ATLORD

Atlanta Hartsfield-Jackson

Mon 10/19

5:10 pm-6:31 pm

Nonstop2h 21m

Chicago O'Hare Intl

Sun 10/25

10:26 am-1:34 pm

Nonstop2h 08m

$138

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Wed 10/28

6:10 am-7:29 am

Nonstop2h 19m

Chicago O'Hare Intl

Sat 10/31

6:29 pm-9:42 pm

Nonstop2h 13m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Mon 10/19

7:10 pm-8:29 pm

Nonstop2h 19m

Chicago O'Hare Intl

Wed 10/21

3:00 pm-6:13 pm

Nonstop2h 13m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Thu 10/8

7:17 am-8:45 am

Nonstop2h 28m

Chicago O'Hare Intl

Tue 10/13

9:12 pm-12:16 am

Nonstop2h 04m

$177

BaltimoreChicago

BWI Baltimore/Washington - ORD Chicago O'Hare Intl

BWIORD

Baltimore/Washington

Tue 11/10

6:16 pm-8:04 pm

Nonstop2h 48m

Chicago O'Hare Intl

Thu 11/26

9:00 pm-11:58 pm

Nonstop1h 58m

$177

AtlantaChicago

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

ATLORD

Atlanta Hartsfield-Jackson

Tue 9/15

7:20 am-3:20 pm

1 stop9h 00m

Chicago O'Hare Intl

Wed 9/16

7:11 am-7:54 pm

2 stops11h 43m

$179

AtlantaChicago

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

ATLORD

Atlanta Hartsfield-Jackson

Wed 9/30

7:20 am-3:20 pm

1 stop9h 00m

Chicago O'Hare Intl

Wed 10/7

7:11 am-7:54 pm

2 stops11h 43m

$181

BostonChicago

BOS Boston Logan Intl - ORD Chicago O'Hare Intl

BOSORD

Boston Logan Intl

Sun 10/18

6:55 am-11:24 am

1 stop5h 29m

Chicago O'Hare Intl

Thu 10/22

9:38 am-1:06 pm

Nonstop2h 28m

$193

BostonChicago

BOS Boston Logan Intl - ORD Chicago O'Hare Intl

BOSORD

Boston Logan Intl

Thu 9/17

5:00 pm-7:01 pm

Nonstop3h 01m

Chicago O'Hare Intl

Mon 9/21

8:24 pm-12:09 am

Nonstop2h 45m

$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 $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 $402. 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 $361. 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 $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	$73
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 $73. 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 21.53% of the total bookings. Other popular models include Airbus A321neo with 14.16%, Boeing 737-900 with 10.89%, and Boeing 737 MAX 8 with 7.52%.

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 2,647 reviews	Search Frontier flights
JetBlue	PriceFrom $72	Free Cancellation	Rating 7.1 3,036 reviews	Search JetBlue flights
Delta	PriceFrom $74	Free Cancellation	Rating 7.8 8,529 reviews	Search Delta flights
Contour	PriceFrom $105	Free Cancellation	Rating 7.5 43 reviews	Search Contour flights
Allegiant Air	PriceFrom $110	Free Cancellation	Rating 7.3 675 reviews	Search Allegiant Air flights
Breeze Airways	PriceFrom $128	Free Cancellation	Rating 8.2 312 reviews	Search Breeze Airways flights
United Airlines	PriceFrom $129	Free Cancellation	Rating 7.4 10,121 reviews	Search United Airlines flights
Southwest	PriceFrom $137	Free Cancellation	Rating 8.0 4,204 reviews	Search Southwest flights
American Airlines	PriceFrom $138	Free Cancellation	Rating 7.1 11,995 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $195	Free Cancellation	Rating 7.9 12,841 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 $63

Flights to Los Angelesfrom $39

Flights to Orlandofrom $48

Flights to Miamifrom $73

Flights to San Franciscofrom $46

Flights to Chicagofrom $50

Flights to Las Vegasfrom $39

Flights to Washington, D.C.from $58

Flights to Bostonfrom $80

Flights to Fort Lauderdalefrom $58

Flights to Atlantafrom $42

Flights to Dallasfrom $55

Cheap flights from the United States to Illinois from $73

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 9/30. 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

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JetBlue flights from United States to Illinois

Our best JetBlue 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

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

Complete your trip to Illinois

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According to popular flight searches on momondo this year