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

The number of flights available between United States and Illinois is 3,022 per week as of December 2025. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.

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

As of December 2025, 431 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 47% of daily flights taking off at noon.

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

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

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 47m 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 48m.

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 December 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.

$37 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

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.

7:30 am - 9:12 am

LGA

ORD

2h 42mnonstop

5:53 pm - 8:59 pm

ORD

LGA

2h 06mnonstop

$83Spirit Airlines

Thu, Jan 8 - Wed, Jan 14

7:18 pm - 9:58 pm

DFW

ORD

2h 40mnonstop

3:24 pm - 6:13 pm

ORD

DFW

2h 49mnonstop

$83Frontier

Thu, Feb 19 - Sun, Feb 22

4:29 pm - 6:29 pm

JFK

ORD

3h 00mnonstop

11:55 am - 3:19 pm

ORD

JFK

2h 24mnonstop

$84Frontier

Fri, Jan 30 - Sun, Feb 1

11:00 am - 5:10 pm

SEA

ORD

4h 10mnonstop

6:06 pm - 8:56 pm

ORD

SEA

4h 50mnonstop

$176Alaska Airlines

Thu, Jan 8 - Sun, Jan 18

8:30 am - 2:38 pm

SEA

ORD

4h 08mnonstop

6:06 pm - 8:56 pm

ORD

SEA

4h 50mnonstop

$177Alaska Airlines

Fri, Jan 9 - Wed, Jan 14

8:04 am - 2:15 pm

SEA

ORD

4h 11mnonstop

10:27 am - 1:08 pm

ORD

SEA

4h 41mnonstop

$182American Airlines

Tue, Jan 6 - Tue, Jan 13

12:35 pm - 11:14 pm

SEA

ORD

8h 39m1 stop

3:35 pm - 6:14 pm

ORD

SEA

4h 39mnonstop

$183United Airlines

Thu, Jan 8 - Sat, Jan 10

6:00 am - 12:25 pm

SFO

ORD

4h 25mnonstop

9:00 am - 12:10 pm

ORD

SFO

5h 10mnonstop

$269United Airlines

Thu, Jan 1 - Fri, Jan 9

10:45 pm - 9:01 am

SFO

ORD

8h 16m1 stop

2:20 pm - 11:28 pm

ORD

SFO

11h 08m1 stop

$270Delta

Thu, Jan 1 - Tue, Jan 6

1:20 pm - 9:52 pm

SFO

ORD

6h 32m1 stop

2:20 pm - 10:41 pm

ORD

SFO

10h 21m1 stop

$275Delta

Tue, Feb 3 - Fri, Feb 13

Spirit Airlines flights from United States to Illinois

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

Spirit Airlines

Jan 8

LGA7:30 amNew York LaGuardia

2h 42m

ORD9:12 amChicago O'Hare Intl

Jan 14

ORD5:53 pmChicago O'Hare Intl

2h 06m

LGA8:59 pmNew York LaGuardia

$83

Find similar

Spirit Airlines

Feb 19

LGA7:30 amNew York LaGuardia

2h 42m

ORD9:12 amChicago O'Hare Intl

Feb 23

ORD5:51 pmChicago O'Hare Intl

2h 08m

LGA8:59 pmNew York LaGuardia

$84

Find similar

Spirit Airlines

Feb 10

LGA7:30 amNew York LaGuardia

2h 42m

ORD9:12 amChicago O'Hare Intl

Feb 15

ORD5:51 pmChicago O'Hare Intl

2h 08m

LGA8:59 pmNew York LaGuardia

$87

Find similar

Delta flights from United States to Illinois

Our best Delta deals on United States to Illinois flight tickets

Delta

Jan 15

LGA8:40 pmNew York LaGuardia

2h 54m

ORD10:34 pmChicago O'Hare Intl

Jan 18

ORD7:10 amChicago O'Hare Intl

2h 31m

LGA10:41 amNew York LaGuardia

$139

Find similar

Delta

Jan 15

LGA6:05 amNew York LaGuardia

2h 53m

ORD7:58 amChicago O'Hare Intl

Jan 18

ORD7:10 amChicago O'Hare Intl

2h 31m

LGA10:41 amNew York LaGuardia

$140

Find similar

Delta

Dec 17

JFK10:52 amNew York John F Kennedy Intl

2h 51m

ORD12:43 pmChicago O'Hare Intl

Jan 17

ORD2:30 pmChicago O'Hare Intl

2h 34m

JFK6:04 pmNew York John F Kennedy Intl

$144

Find similar

Fly from

Fly to

Route

Depart

Return

Price

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Thu 1/8

7:30 am-9:12 am

Nonstop2h 42m

Chicago O'Hare Intl

Wed 1/14

5:53 pm-8:59 pm

Nonstop2h 06m

$83

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Thu 2/19

7:18 pm-9:58 pm

Nonstop2h 40m

Chicago O'Hare Intl

Sun 2/22

3:24 pm-6:13 pm

Nonstop2h 49m

$83

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Fri 1/30

4:29 pm-6:29 pm

Nonstop3h 00m

Chicago O'Hare Intl

Sun 2/1

11:55 am-3:19 pm

Nonstop2h 24m

$84

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 1/8

11:00 am-5:10 pm

Nonstop4h 10m

Chicago O'Hare Intl

Sun 1/18

6:06 pm-8:56 pm

Nonstop4h 50m

$176

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 1/9

8:30 am-2:38 pm

Nonstop4h 08m

Chicago O'Hare Intl

Wed 1/14

6:06 pm-8:56 pm

Nonstop4h 50m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 1/6

8:04 am-2:15 pm

Nonstop4h 11m

Chicago O'Hare Intl

Tue 1/13

10:27 am-1:08 pm

Nonstop4h 41m

$182

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 1/8

12:35 pm-11:14 pm

1 stop8h 39m

Chicago O'Hare Intl

Sat 1/10

3:35 pm-6:14 pm

Nonstop4h 39m

$183

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 1/1

6:00 am-12:25 pm

Nonstop4h 25m

Chicago O'Hare Intl

Fri 1/9

9:00 am-12:10 pm

Nonstop5h 10m

$269

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 1/1

10:45 pm-9:01 am

1 stop8h 16m

Chicago O'Hare Intl

Tue 1/6

2:20 pm-11:28 pm

1 stop11h 08m

$270

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 2/3

1:20 pm-9:52 pm

1 stop6h 32m

Chicago O'Hare Intl

Fri 2/13

2:20 pm-10:41 pm

1 stop10h 21m

$275

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 $182, 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 $357. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $440. 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 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	$34
Fastest flight time	0h 50m
Direct flights	Every day
Airports in Illinois	2 airports

The best one-way flight to Illinois from United States in the past 72 hours is $34. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $69.

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

Direct flights go from United States to Illinois every day.

There are 2 airports near Illinois: 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 December 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 21.57% of the total bookings. Other popular models include Airbus A321neo with 12.67%, Boeing 737-900 with 10.16%, and Boeing 737 MAX 8 with 7.16%.

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 3,085 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $58	Free Cancellation	Rating 6.3 8,174 reviews	Search Spirit Airlines flights
JetBlue	PriceFrom $78	Free Cancellation	Rating 7.2 2,899 reviews	Search JetBlue flights
Allegiant Air	PriceFrom $91	Free Cancellation	Rating 7.2 699 reviews	Search Allegiant Air flights
Delta	PriceFrom $101	Free Cancellation	Rating 7.9 8,007 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,818 reviews	Search Hawaiian Airlines flights
Contour	PriceFrom $109	Free Cancellation	Rating 7.6 43 reviews	Search Contour flights
Southwest	PriceFrom $117	Free Cancellation	Rating 7.9 4,253 reviews	Search Southwest flights
United Airlines	PriceFrom $118	Free Cancellation	Rating 7.4 9,092 reviews	Search United Airlines flights
Breeze Airways	PriceFrom $121	Free Cancellation	Rating 8.2 243 reviews	Search Breeze Airways 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.