What airlines fly to Illinois?

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Illinois from United States according to our data. American 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 13 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

United Airlines, Frontier, and Spirit Airlines 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 January 2026, 393 flights take off from United States and land in Illinois each day. The most common flight departure time for this route is 9:00AM, with 46% 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 44m 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 50m.

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

The number of flights available between United States and Illinois is 2,753 per week as of January 2026. The most frequent departure day is Thu, with 18% 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 January 2026, there are 11 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.

$53 Cheap Flights from the United States to Illinois in 2026

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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.

12:05 pm - 1:32 pm

BWI

ORD

2h 27mnonstop

8:45 am - 11:45 am

ORD

BWI

2h 00mnonstop

$69Frontier

Thu, Jan 22 - Mon, Jan 26

12:05 pm - 1:32 pm

BWI

ORD

2h 27mnonstop

8:45 am - 11:45 am

ORD

BWI

2h 00mnonstop

$70Frontier

Thu, Jan 22 - Mon, Jan 26

4:28 pm - 5:55 pm

BWI

ORD

2h 27mnonstop

12:43 pm - 3:43 pm

ORD

BWI

2h 00mnonstop

$71Frontier

Mon, Mar 9 - Mon, Mar 16

7:30 am - 9:12 am

LGA

ORD

2h 42mnonstop

7:20 am - 7:40 pm

ORD

LGA

11h 20m1 stop

$93Spirit Airlines

Wed, Jan 28 - Fri, Jan 30

7:30 am - 9:12 am

LGA

ORD

2h 42mnonstop

5:58 pm - 8:59 pm

ORD

LGA

2h 01mnonstop

$94Spirit Airlines

Sat, Feb 7 - Sun, Feb 15

12:44 pm - 2:01 pm

DCA

ORD

2h 17mnonstop

9:10 pm - 11:59 pm

ORD

DCA

1h 49mnonstop

$143American Airlines

Wed, Feb 4 - Thu, Feb 5

6:00 am - 1:00 pm

DCA

ORD

8h 00m1 stop

2:15 pm - 11:15 pm

ORD

DCA

8h 00m1 stop

$149Southwest

Wed, Feb 4 - Wed, Feb 11

12:00 pm - 1:15 pm

DCA

ORD

2h 15mnonstop

9:00 am - 11:58 am

ORD

DCA

1h 58mnonstop

$150United Airlines

Thu, Jan 29 - Tue, Feb 3

12:44 pm - 2:01 pm

DCA

ORD

2h 17mnonstop

9:10 pm - 11:59 pm

ORD

DCA

1h 49mnonstop

$151American Airlines

Wed, Feb 4 - Thu, Feb 5

3:30 pm - 4:49 pm

DCA

ORD

2h 19mnonstop

4:15 pm - 9:52 pm

ORD

DCA

4h 37m1 stop

$152United Airlines

Wed, Feb 4 - Wed, Feb 11

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Jan 22

BWI12:05 pmBaltimore/Washington

2h 27m

ORD1:32 pmChicago O'Hare Intl

Jan 26

ORD8:45 amChicago O'Hare Intl

2h 00m

BWI11:45 amBaltimore/Washington

$69

Frontier

Jan 22

BWI12:05 pmBaltimore/Washington

2h 27m

ORD1:32 pmChicago O'Hare Intl

Jan 26

ORD8:45 amChicago O'Hare Intl

2h 00m

BWI11:45 amBaltimore/Washington

$70

Frontier

Mar 9

BWI4:28 pmBaltimore/Washington

2h 27m

ORD5:55 pmChicago O'Hare Intl

Mar 16

ORD12:43 pmChicago O'Hare Intl

2h 00m

BWI3:43 pmBaltimore/Washington

$71

United Airlines flights from United States to Illinois

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

United Airlines

Jan 21

EWR4:29 pmNewark

2h 46m

ORD6:15 pmChicago O'Hare Intl

Jan 24

ORD7:10 amChicago O'Hare Intl

2h 14m

EWR10:24 amNewark

$111

United Airlines

Mar 31

EWR7:29 amNewark

2h 44m

ORD9:13 amChicago O'Hare Intl

Apr 6

ORD9:55 pmChicago O'Hare Intl

2h 20m

EWR1:15 amNewark

$122

United Airlines

Feb 4

BWI5:18 pmBaltimore/Washington

2h 20m

ORD6:38 pmChicago O'Hare Intl

Feb 11

ORD11:05 amChicago O'Hare Intl

2h 06m

BWI2:11 pmBaltimore/Washington

$129

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/22

12:05 pm-1:32 pm

Nonstop2h 27m

Chicago O'Hare Intl

Mon 1/26

8:45 am-11:45 am

Nonstop2h 00m

$69

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/22

12:05 pm-1:32 pm

Nonstop2h 27m

Chicago O'Hare Intl

Mon 1/26

8:45 am-11:45 am

Nonstop2h 00m

$70

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Mon 3/9

4:28 pm-5:55 pm

Nonstop2h 27m

Chicago O'Hare Intl

Mon 3/16

12:43 pm-3:43 pm

Nonstop2h 00m

$71

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Wed 1/28

7:30 am-9:12 am

Nonstop2h 42m

Chicago O'Hare Intl

Fri 1/30

7:20 am-7:40 pm

1 stop11h 20m

$93

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Sat 2/7

7:30 am-9:12 am

Nonstop2h 42m

Chicago O'Hare Intl

Sun 2/15

5:58 pm-8:59 pm

Nonstop2h 01m

$94

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 2/4

12:44 pm-2:01 pm

Nonstop2h 17m

Chicago O'Hare Intl

Thu 2/5

9:10 pm-11:59 pm

Nonstop1h 49m

$143

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 2/4

6:00 am-1:00 pm

1 stop8h 00m

Chicago O'Hare Intl

Wed 2/11

2:15 pm-11:15 pm

1 stop8h 00m

$149

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Thu 1/29

12:00 pm-1:15 pm

Nonstop2h 15m

Chicago O'Hare Intl

Tue 2/3

9:00 am-11:58 am

Nonstop1h 58m

$150

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 2/4

12:44 pm-2:01 pm

Nonstop2h 17m

Chicago O'Hare Intl

Thu 2/5

9:10 pm-11:59 pm

Nonstop1h 49m

$151

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 2/4

3:30 pm-4:49 pm

Nonstop2h 19m

Chicago O'Hare Intl

Wed 2/11

4:15 pm-9:52 pm

1 stop4h 37m

$152

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 $179, 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 $192.

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 Thursday when prices can be found for as low as $357. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $429. 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 $272. Flights at noon are often more expensive with an average ticket price of $454.

What is the cheapest United States to Illinois flight route?

Fly from Atlanta Hartsfield-Jackson to Chicago O'Hare Intl 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 $237 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 $168 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	$29
Fastest flight time	0h 50m
Direct flights	Mon, Wed, Thu, Fri, Sat and Sun
Airports in Illinois	98 airports

The best one-way flight to Illinois from United States in the past 72 hours is $29. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $68.

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

Direct flights go from United States to Illinois on Monday, Wednesday, Thursday, Friday, Saturday and Sunday. Airlines offering direct flights are: Avelo Airlines, Southwest and Delta.

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

Search flight deals

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 January 2026, there are 11 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 21.17% of the total bookings. Other popular models include Airbus A321neo with 13.33%, Boeing 737-900 with 9.29%, and Boeing 737 MAX 8 with 6.63%.

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 $55	Free Cancellation	Rating 5.7 3,061 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $59	Free Cancellation	Rating 6.3 8,287 reviews	Search Spirit Airlines flights
JetBlue	PriceFrom $73	Free Cancellation	Rating 7.2 2,893 reviews	Search JetBlue flights
Allegiant Air	PriceFrom $77	Free Cancellation	Rating 7.2 702 reviews	Search Allegiant Air flights
Delta	PriceFrom $101	Free Cancellation	Rating 7.9 8,027 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,824 reviews	Search Hawaiian Airlines flights
Southwest	PriceFrom $117	Free Cancellation	Rating 8.0 4,250 reviews	Search Southwest flights
United Airlines	PriceFrom $118	Free Cancellation	Rating 7.4 9,139 reviews	Search United Airlines flights
Breeze Airways	PriceFrom $121	Free Cancellation	Rating 8.2 255 reviews	Search Breeze Airways flights
American Airlines	PriceFrom $128	Free Cancellation	Rating 7.2 11,097 reviews	Search American 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

Cheap flights from the United States to Illinois from $53

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 2/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

Filter for what you want

Filter for what you want

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Trusted and free

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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

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

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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?

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 $272. Flights at noon are often more expensive with an average ticket price of $454.

What is the cheapest United States to Illinois flight route?

Fly from Atlanta Hartsfield-Jackson to Chicago O'Hare Intl for the best United States - Illinois flight prices

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

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.

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

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

What airlines fly to Illinois?

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

As of January 2026, 393 flights take off from United States and land in Illinois each day. The most common flight departure time for this route is 9:00AM, with 46% of daily flights taking off at noon.

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

The number of flights available between United States and Illinois is 2,753 per week as of January 2026. The most frequent departure day is Thu, with 18% of weekly flights leaving on this day.

How long is the flight from 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

Fastest flight time

Direct flights

Airports in Illinois

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

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

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

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

What is the most popular plane model from 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?

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

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

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

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

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