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.

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 46m 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 2,819 per week as of January 2026. The most frequent departure day is Thu, with 19% of weekly flights leaving on this day.

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

As of January 2026, 402 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 43% 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

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.

$49 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.

5:47 pm - 11:47 pm

ATL

ORD

7h 00m

1 stop

11:51 am - 3:01 pm

ORD

ATL

2h 10mnonstop

$77Multiple Airlines

mié., feb. 18 - mar., feb. 24

9:15 pm - 10:39 pm

ATL

ORD

2h 24mnonstop

5:05 am - 8:22 am

ORD

ATL

2h 17mnonstop

$78Frontier

jue., feb. 26 - jue., mar. 5

9:47 am - 11:16 am

ATL

ORD

2h 29mnonstop

5:01 am - 8:18 am

ORD

ATL

2h 17mnonstop

$79Frontier

sáb., mar. 14 - lun., mar. 16

9:45 am - 11:14 am

ATL

ORD

2h 29mnonstop

5:05 am - 8:22 am

ORD

ATL

2h 17mnonstop

$80Frontier

mié., feb. 11 - lun., feb. 16

11:05 pm - 12:40 am

EWR

ORD

2h 35mnonstop

6:16 pm - 9:24 pm

ORD

EWR

2h 08mnonstop

$89Spirit Airlines

mar., mar. 10 - jue., mar. 12

11:05 pm - 12:40 am

EWR

ORD

2h 35mnonstop

6:16 pm - 9:24 pm

ORD

EWR

2h 08mnonstop

$90Spirit Airlines

dom., mar. 8 - sáb., mar. 14

1:00 pm - 2:22 pm

DCA

ORD

2h 22mnonstop

7:00 am - 9:54 am

ORD

DCA

1h 54mnonstop

$197United Airlines

mié., feb. 25 - mié., mar. 4

7:59 pm - 9:24 pm

DCA

ORD

2h 25mnonstop

7:48 pm - 11:00 pm

ORD

DCA

2h 12mnonstop

$198American Airlines

mar., feb. 24 - mar., mar. 3

6:00 am - 11:59 am

DCA

ORD

6h 59m

1 stop

10:00 am - 6:55 pm

ORD

DCA

7h 55m

1 stop

$207JetBlue

mar., feb. 24 - mar., mar. 3

11:59 pm - 6:19 am

SFO

ORD

4h 20mnonstop

6:17 pm - 9:20 pm

ORD

SFO

5h 03mnonstop

$250United Airlines

vie., feb. 20 - mar., feb. 24

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Feb 26

ATL9:15 pmAtlanta Hartsfield-Jackson

2h 24m

ORD10:39 pmChicago O'Hare Intl

Mar 5

ORD5:05 amChicago O'Hare Intl

2h 17m

ATL8:22 amAtlanta Hartsfield-Jackson

$78

Frontier

Feb 5

ATL9:22 pmAtlanta Hartsfield-Jackson

2h 24m

ORD10:46 pmChicago O'Hare Intl

Feb 8

ORD5:40 amChicago O'Hare Intl

2h 17m

ATL8:57 amAtlanta Hartsfield-Jackson

$79

Frontier

Feb 11

ATL9:45 amAtlanta Hartsfield-Jackson

2h 29m

ORD11:14 amChicago O'Hare Intl

Feb 16

ORD5:05 amChicago O'Hare Intl

2h 17m

ATL8:22 amAtlanta Hartsfield-Jackson

$80

Spirit Airlines flights from United States to Illinois

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

Spirit Airlines

Mar 10

EWR11:05 pmNewark

2h 35m

ORD12:40 amChicago O'Hare Intl

Mar 12

ORD6:16 pmChicago O'Hare Intl

2h 08m

EWR9:24 pmNewark

$89

Spirit Airlines

Mar 8

EWR11:05 pmNewark

2h 35m

ORD12:40 amChicago O'Hare Intl

Mar 14

ORD6:16 pmChicago O'Hare Intl

2h 08m

EWR9:24 pmNewark

$90

Spirit Airlines

Feb 26

EWR12:02 pmNewark

8h 09m

1 stop

ORD7:11 pmChicago O'Hare Intl

Feb 27

ORD6:51 pmChicago O'Hare Intl

2h 09m

EWR10:00 pmNewark

$91

Fly from

Fly to

Route

Depart

Return

Price

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

mié. 2/18

5:47 pm-11:47 pm

1 stop7h 00m

Chicago O'Hare Intl

mar. 2/24

11:51 am-3:01 pm

Nonstop2h 10m

$77

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

jue. 2/26

9:15 pm-10:39 pm

Nonstop2h 24m

Chicago O'Hare Intl

jue. 3/5

5:05 am-8:22 am

Nonstop2h 17m

$78

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

sáb. 3/14

9:47 am-11:16 am

Nonstop2h 29m

Chicago O'Hare Intl

lun. 3/16

5:01 am-8:18 am

Nonstop2h 17m

$79

AtlantaChicago

ATL - ORD

ATLORD

Atlanta Hartsfield-Jackson

mié. 2/11

9:45 am-11:14 am

Nonstop2h 29m

Chicago O'Hare Intl

lun. 2/16

5:05 am-8:22 am

Nonstop2h 17m

$80

NewarkChicago

EWR - ORD

EWRORD

Newark

mar. 3/10

11:05 pm-12:40 am

Nonstop2h 35m

Chicago O'Hare Intl

jue. 3/12

6:16 pm-9:24 pm

Nonstop2h 08m

$89

NewarkChicago

EWR - ORD

EWRORD

Newark

dom. 3/8

11:05 pm-12:40 am

Nonstop2h 35m

Chicago O'Hare Intl

sáb. 3/14

6:16 pm-9:24 pm

Nonstop2h 08m

$90

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

mié. 2/25

1:00 pm-2:22 pm

Nonstop2h 22m

Chicago O'Hare Intl

mié. 3/4

7:00 am-9:54 am

Nonstop1h 54m

$197

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

mar. 2/24

7:59 pm-9:24 pm

Nonstop2h 25m

Chicago O'Hare Intl

mar. 3/3

7:48 pm-11:00 pm

Nonstop2h 12m

$198

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

mar. 2/24

6:00 am-11:59 am

1 stop6h 59m

Chicago O'Hare Intl

mar. 3/3

10:00 am-6:55 pm

1 stop7h 55m

$207

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

vie. 2/20

11:59 pm-6:19 am

Nonstop4h 20m

Chicago O'Hare Intl

mar. 2/24

6:17 pm-9:20 pm

Nonstop5h 03m

$250

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 $187, 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 $187.

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 $356. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $431. 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 $274. Flights at noon are often more expensive with an average ticket price of $450.

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 $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	$48
Fastest flight time	0h 50m
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 $48. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $72.

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

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

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 19.79% of the total bookings. Other popular models include Airbus A321neo with 13.94%, Boeing 737-900 with 9.63%, and Embraer 175 with 6.48%.

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 $43	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $45	Free Cancellation	Rating 6.3 8,389 reviews	Search Spirit Airlines flights
JetBlue	PriceFrom $68	Free Cancellation	Rating 7.2 2,892 reviews	Search JetBlue flights
Allegiant Air	PriceFrom $68	Free Cancellation	Rating 7.2 706 reviews	Search Allegiant Air flights
Delta	PriceFrom $80	Free Cancellation	Rating 7.9 8,128 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $101	Free Cancellation	Rating 7.8 2,830 reviews	Search Hawaiian Airlines flights
Southwest	PriceFrom $117	Free Cancellation	Rating 8.0 4,267 reviews	Search Southwest flights
United Airlines	PriceFrom $117	Free Cancellation	Rating 7.4 9,214 reviews	Search United Airlines flights
Breeze Airways	PriceFrom $121	Free Cancellation	Rating 8.2 263 reviews	Search Breeze Airways flights
American Airlines	PriceFrom $128	Free Cancellation	Rating 7.2 11,206 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.