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

As of November 2025, 375 flights take off from United States and land in Illinois each day. The most common flight departure time for this route is 6:00AM, 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 2,627 per week as of November 2025. The most frequent departure day is Tue, with 22% of weekly flights leaving on this day.

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 48m 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.

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

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 39% 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.

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 November 2025, 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.

$43 Cheap Flights from the United States to Illinois in 2025/26

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Find the cheapest flights from the United States to Illinois

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One-way

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

Enter your travel dates to find the best prices.

7:01 am - 8:16 amATL-ORD

2h 15mnonstop

8:00 am - 11:20 amORD-ATL

2h 20mnonstop

$70Frontier

Find Deal

Sun, Dec 14 - Wed, Dec 17

9:10 pm - 10:24 pmATL-ORD

2h 14mnonstop

6:11 am - 9:31 amORD-ATL

2h 20mnonstop

$71Frontier

Find Deal

Sat, Dec 13 - Sun, Dec 14

9:07 am - 6:36 pmATL-ORD

10h 29m1 stop

10:00 am - 1:07 pmORD-ATL

2h 07mnonstop

$72Multiple Airlines

Find Deal

Thu, Dec 11 - Tue, Dec 16

2:29 pm - 8:01 pmATL-ORD

6h 32m1 stop

10:00 am - 1:07 pmORD-ATL

2h 07mnonstop

$73Multiple Airlines

Find Deal

Wed, Dec 10 - Tue, Dec 16

8:41 pm - 10:11 pmLGA-ORD

2h 30mnonstop

4:38 pm - 7:42 pmORD-LGA

2h 04mnonstop

$86Spirit Airlines

Find Deal

Thu, Dec 11 - Tue, Dec 16

8:41 pm - 10:11 pmLGA-ORD

2h 30mnonstop

4:38 pm - 7:42 pmORD-LGA

2h 04mnonstop

$87Spirit Airlines

Find Deal

Fri, Dec 5 - Mon, Dec 8

8:04 am - 2:15 pmSEA-ORD

4h 11mnonstop

7:36 pm - 10:20 pmORD-SEA

4h 44mnonstop

$179American Airlines

Find Deal

Fri, Feb 6 - Mon, Feb 9

12:57 pm - 12:28 amSEA-ORD

9h 31m1 stop

7:54 pm - 10:43 pmORD-SEA

4h 49mnonstop

$183United Airlines

Find Deal

Thu, Jan 15 - Sun, Jan 18

7:10 am - 1:20 pmSEA-ORD

4h 10mnonstop

2:20 pm - 5:00 pmORD-SEA

4h 40mnonstop

$188Delta

Find Deal

Thu, Jan 1 - Wed, Jan 7

12:14 am - 6:07 amSEA-ORD

3h 53mnonstop

7:25 am - 10:02 amORD-SEA

4h 37mnonstop

$190American Airlines

Find Deal

Tue, Dec 30 - Mon, Jan 5

Spirit Airlines flights from United States to Illinois

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

Spirit Airlines

Dec 9

ATL2:29 pmAtlanta Hartsfield-Jackson

6h 32m

1 stop

ORD8:01 pmChicago O'Hare Intl

Dec 10

ORD7:10 amChicago O'Hare Intl

9h 16m

1 stop

ATL5:26 pmAtlanta Hartsfield-Jackson

$85

Find similar

Spirit Airlines

Dec 11

LGA8:41 pmNew York LaGuardia

2h 30m

ORD10:11 pmChicago O'Hare Intl

Dec 16

ORD4:38 pmChicago O'Hare Intl

2h 04m

LGA7:42 pmNew York LaGuardia

$86

Find similar

Spirit Airlines

Dec 16

DFW11:33 amDallas/Fort Worth

2h 25m

ORD1:58 pmChicago O'Hare Intl

Dec 17

ORD7:20 amChicago O'Hare Intl

2h 38m

DFW9:58 amDallas/Fort Worth

$87

Find similar

American Airlines flights from United States to Illinois

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

American Airlines

Feb 26

DFW6:15 amDallas/Fort Worth

2h 27m

ORD8:42 amChicago O'Hare Intl

Mar 4

ORD11:45 amChicago O'Hare Intl

2h 40m

DFW2:25 pmDallas/Fort Worth

$130

Find similar

American Airlines

Jan 17

DEN7:20 amDenver Intl

2h 40m

ORD11:00 amChicago O'Hare Intl

Jan 20

ORD8:50 amChicago O'Hare Intl

2h 59m

DEN10:49 amDenver Intl

$144

Find similar

American Airlines

Jan 15

EWR7:00 amNewark

2h 53m

ORD8:53 amChicago O'Hare Intl

Jan 18

ORD8:07 amChicago O'Hare Intl

2h 16m

EWR11:23 amNewark

$147

Find similar

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

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

Sun 12/14

7:01 am-8:16 am

Nonstop2h 15m

Chicago O'Hare Intl

Wed 12/17

8:00 am-11:20 am

Nonstop2h 20m

$70

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

Sat 12/13

9:10 pm-10:24 pm

Nonstop2h 14m

Chicago O'Hare Intl

Sun 12/14

6:11 am-9:31 am

Nonstop2h 20m

$71

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

Thu 12/11

9:07 am-6:36 pm

1 stop10h 29m

Chicago O'Hare Intl

Tue 12/16

10:00 am-1:07 pm

Nonstop2h 07m

$72

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

Wed 12/10

2:29 pm-8:01 pm

1 stop6h 32m

Chicago O'Hare Intl

Tue 12/16

10:00 am-1:07 pm

Nonstop2h 07m

$73

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Thu 12/11

8:41 pm-10:11 pm

Nonstop2h 30m

Chicago O'Hare Intl

Tue 12/16

4:38 pm-7:42 pm

Nonstop2h 04m

$86

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Fri 12/5

8:41 pm-10:11 pm

Nonstop2h 30m

Chicago O'Hare Intl

Mon 12/8

4:38 pm-7:42 pm

Nonstop2h 04m

$87

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 2/6

8:04 am-2:15 pm

Nonstop4h 11m

Chicago O'Hare Intl

Mon 2/9

7:36 pm-10:20 pm

Nonstop4h 44m

$179

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 1/15

12:57 pm-12:28 am

1 stop9h 31m

Chicago O'Hare Intl

Sun 1/18

7:54 pm-10:43 pm

Nonstop4h 49m

$183

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 1/1

7:10 am-1:20 pm

Nonstop4h 10m

Chicago O'Hare Intl

Wed 1/7

2:20 pm-5:00 pm

Nonstop4h 40m

$188

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 12/30

12:14 am-6:07 am

Nonstop3h 53m

Chicago O'Hare Intl

Mon 1/5

7:25 am-10:02 am

Nonstop4h 37m

$190

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 $183, 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 $189.

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 $358. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $453. 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 $276. Flights at noon are often more expensive with an average ticket price of $459.

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 $248 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 $186 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	$48
Fastest flight time	0h 50m
Direct flights	Every day
Airports in Illinois	1 airport

The best one-way flight to Illinois from United States in the past 72 hours is $48. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $71.

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

Direct flights go from United States to Illinois every day.

There is 1 airport near Illinois: Chicago O'Hare Intl (ORD)

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 November 2025, 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 22.51% of the total bookings. Other popular models include Airbus A321neo with 12.06%, Boeing 737-900 with 10.53%, and Airbus A320neo with 6.78%.

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 5.8 3,099 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $59	Free Cancellation	Rating 6.3 8,158 reviews	Search Spirit Airlines flights
Allegiant Air	PriceFrom $77	Free Cancellation	Rating 7.2 700 reviews	Search Allegiant Air flights
JetBlue	PriceFrom $79	Free Cancellation	Rating 7.2 2,905 reviews	Search JetBlue flights
Delta	PriceFrom $101	Free Cancellation	Rating 7.9 7,998 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,814 reviews	Search Hawaiian Airlines flights
Southwest	PriceFrom $117	Free Cancellation	Rating 8.0 4,254 reviews	Search Southwest flights
Breeze Airways	PriceFrom $121	Free Cancellation	Rating 8.2 238 reviews	Search Breeze Airways flights
United Airlines	PriceFrom $126	Free Cancellation	Rating 7.4 9,046 reviews	Search United Airlines flights
Sun Country Air	PriceFrom $130	Free Cancellation	Rating 6.9 333 reviews	Search Sun Country Air 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.