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 day?

As of November 2026, 520 flights take off from United States and land in Illinois each day. The most common flight departure time for this route is 10:00AM, with 39% 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 39% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 11 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 3,643 per week as of November 2026. The most frequent departure day is Mon, with 20% 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 November 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.

$82 Cheap Flights from the United States to Illinois in 2026/27

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.

6:00 am - 7:20 amATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 20mnonstop

10:29 pm - 1:37 amORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 08mnonstop

$128Frontier

Fri, Dec 11 - Sun, Dec 13

6:00 am - 7:15 amATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 15mnonstop

8:25 am - 9:59 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

12h 34m1 stop Fort Lauderdale

$129Frontier

Fri, Dec 4 - Tue, Jan 12

9:00 am - 4:10 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

8h 10m1 stop Dallas/Fort Worth

2:59 pm - 7:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$144Multiple Airlines

Wed, Dec 2 - Wed, Dec 9

9:00 am - 4:33 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

8h 33m1 stop Dallas/Fort Worth

2:59 pm - 7:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$144Multiple Airlines

Tue, Dec 8 - Tue, Dec 15

6:24 am - 9:04 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 40mnonstop

4:59 pm - 9:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$145American Airlines

Wed, Dec 16 - Thu, Dec 31

9:57 am - 12:30 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 33mnonstop

6:10 pm - 10:20 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$146American Airlines

Wed, Nov 18 - Wed, Dec 9

8:00 am - 4:42 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

9h 42m1 stop Boston Logan Intl

7:00 am - 11:10 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$147JetBlue

Tue, Dec 8 - Wed, Dec 9

9:10 pm - 11:33 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 23mnonstop

2:59 pm - 7:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$150JetBlue

Wed, Dec 2 - Wed, Dec 9

5:30 pm - 7:57 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 27mnonstop

8:55 am - 1:05 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$151United Airlines

Wed, Apr 21 - Sat, Apr 24

8:35 am - 11:09 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 34mnonstop

8:03 pm - 12:29 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 26mnonstop

$152United Airlines

Tue, Dec 22 - Tue, Dec 22

Recent last minute flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

1:05 pm - 3:37 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 32mnonstop

7:55 am - 12:02 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 07mnonstop

$144Frontier

Sat, Nov 7 - Sat, Nov 14

9:00 pm - 3:37 pmATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

19h 37m1 stop Fort Lauderdale

7:49 am - 11:14 amORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 25mnonstop

$150Frontier

Fri, Nov 6 - Mon, Nov 23

1:05 pm - 3:37 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 32mnonstop

7:00 am - 11:10 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$161Multiple Airlines

Sat, Nov 7 - Wed, Nov 11

1:05 pm - 3:37 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 32mnonstop

2:59 pm - 7:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$161Multiple Airlines

Sat, Nov 7 - Tue, Nov 10

9:35 pm - 11:57 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 22mnonstop

7:00 am - 11:10 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$188JetBlue

Thu, Nov 5 - Thu, Nov 12

9:00 am - 11:28 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 28mnonstop

10:55 am - 3:08 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 13mnonstop

$204United Airlines

Thu, Nov 5 - Tue, Dec 8

9:15 pm - 11:36 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 21mnonstop

7:00 am - 11:10 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$205JetBlue

Sat, Nov 7 - Tue, Nov 10

7:00 am - 9:31 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 31mnonstop

7:45 pm - 11:59 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 14mnonstop

$221United Airlines

Thu, Nov 5 - Fri, Nov 6

6:27 am - 9:05 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 38mnonstop

7:23 pm - 11:26 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 03mnonstop

$237American Airlines

Sun, Nov 8 - Mon, Nov 9

6:27 am - 9:05 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 38mnonstop

5:05 pm - 9:13 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 08mnonstop

$237American Airlines

Sun, Nov 8 - Tue, Nov 10

Recent direct flight deals from the United States to Illinois

Enter your travel dates to find the best prices.

6:00 am - 7:20 amATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 20mnonstop

10:29 pm - 1:37 amORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 08mnonstop

$128Frontier

Fri, Dec 11 - Sun, Dec 13

10:27 am - 11:50 amATL Atlanta Hartsfield-Jackson-ORD Chicago O'Hare Intl

2h 23mnonstop

5:32 pm - 9:00 pmORD Chicago O'Hare Intl-ATL Atlanta Hartsfield-Jackson

2h 28mnonstop

$129Frontier

Thu, Feb 25 - Mon, Mar 1

9:02 pm - 11:34 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 32mnonstop

2:59 pm - 7:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$144Multiple Airlines

Fri, Nov 20 - Sat, Dec 5

9:02 pm - 11:34 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 32mnonstop

7:00 am - 11:10 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$144Multiple Airlines

Mon, Nov 23 - Sat, Dec 5

6:24 am - 9:04 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 40mnonstop

4:59 pm - 9:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$145American Airlines

Wed, Dec 16 - Thu, Dec 31

9:57 am - 12:30 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 33mnonstop

6:10 pm - 10:20 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$146American Airlines

Wed, Nov 18 - Wed, Dec 9

9:10 pm - 11:33 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 23mnonstop

2:59 pm - 7:10 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 11mnonstop

$150JetBlue

Wed, Dec 2 - Wed, Dec 9

9:10 pm - 11:33 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 23mnonstop

7:00 am - 11:10 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$150JetBlue

Tue, Dec 15 - Wed, Dec 16

5:30 pm - 7:57 pmFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 27mnonstop

8:55 am - 1:05 pmORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 10mnonstop

$151United Airlines

Wed, Apr 21 - Sat, Apr 24

8:35 am - 11:09 amFLL Fort Lauderdale-ORD Chicago O'Hare Intl

3h 34mnonstop

8:03 pm - 12:29 amORD Chicago O'Hare Intl-FLL Fort Lauderdale

3h 26mnonstop

$152United Airlines

Tue, Dec 22 - Tue, Dec 22

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Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Dec 11

ATL6:00 amAtlanta Hartsfield-Jackson

2h 20m

ORD7:20 amChicago O'Hare Intl

Dec 13

ORD10:29 pmChicago O'Hare Intl

2h 08m

ATL1:37 amAtlanta Hartsfield-Jackson

$128

Frontier

Dec 3

ATL7:20 amAtlanta Hartsfield-Jackson

7h 36m

1 stop

ORD1:56 pmChicago O'Hare Intl

Dec 13

ORD8:15 amChicago O'Hare Intl

2h 21m

ATL11:36 amAtlanta Hartsfield-Jackson

$129

Frontier

Dec 2

ATL12:41 pmAtlanta Hartsfield-Jackson

2h 19m

ORD2:00 pmChicago O'Hare Intl

Dec 5

ORD10:00 amChicago O'Hare Intl

11h 55m

1 stop

ATL10:55 pmAtlanta Hartsfield-Jackson

$130

Contour flights from United States to Illinois

Our best Contour deals on United States to Illinois flight tickets

Contour

Nov 14

DFW9:30 amDallas/Fort Worth

4h 45m

1 stop

ORD2:15 pmChicago O'Hare Intl

Nov 16

ORD2:55 pmChicago O'Hare Intl

4h 20m

1 stop

DFW7:15 pmDallas/Fort Worth

$245

Contour

Nov 13

DFW9:30 amDallas/Fort Worth

4h 45m

1 stop

ORD2:15 pmChicago O'Hare Intl

Nov 16

ORD2:55 pmChicago O'Hare Intl

4h 20m

1 stop

DFW7:15 pmDallas/Fort Worth

$248

Contour

Nov 13

DFW9:30 amDallas/Fort Worth

4h 45m

1 stop

ORD2:15 pmChicago O'Hare Intl

Nov 16

ORD2:55 pmChicago O'Hare Intl

4h 20m

1 stop

DFW7:15 pmDallas/Fort Worth

$252

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

Quickest round-trip

AtlantaChicago

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

ATLORD

Atlanta Hartsfield-Jackson

Fri 12/11

6:00 am-7:20 am

Nonstop2h 20m

Chicago O'Hare Intl

Sun 12/13

10:29 pm-1:37 am

Nonstop2h 08m

$128

AtlantaChicago

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

ATLORD

Atlanta Hartsfield-Jackson

Fri 12/4

6:00 am-7:15 am

Nonstop2h 15m

Chicago O'Hare Intl

Tue 1/12

8:25 am-9:59 pm

1 stop12h 34m

$129

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Wed 12/2

9:00 am-4:10 pm

1 stop8h 10m

Chicago O'Hare Intl

Wed 12/9

2:59 pm-7:10 pm

Nonstop3h 11m

$144

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Tue 12/8

9:00 am-4:33 pm

1 stop8h 33m

Chicago O'Hare Intl

Tue 12/15

2:59 pm-7:10 pm

Nonstop3h 11m

$144

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Wed 12/16

6:24 am-9:04 am

Nonstop3h 40m

Chicago O'Hare Intl

Thu 12/31

4:59 pm-9:10 pm

Nonstop3h 11m

$145

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Wed 11/18

9:57 am-12:30 pm

Nonstop3h 33m

Chicago O'Hare Intl

Wed 12/9

6:10 pm-10:20 pm

Nonstop3h 10m

$146

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Tue 12/8

8:00 am-4:42 pm

1 stop9h 42m

Chicago O'Hare Intl

Wed 12/9

7:00 am-11:10 am

Nonstop3h 10m

$147

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Wed 12/2

9:10 pm-11:33 pm

Nonstop3h 23m

Chicago O'Hare Intl

Wed 12/9

2:59 pm-7:10 pm

Nonstop3h 11m

$150

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Wed 4/21

5:30 pm-7:57 pm

Nonstop3h 27m

Chicago O'Hare Intl

Sat 4/24

8:55 am-1:05 pm

Nonstop3h 10m

$151

Fort LauderdaleChicago

FLL Fort Lauderdale - ORD Chicago O'Hare Intl

FLLORD

Fort Lauderdale

Tue 12/22

8:35 am-11:09 am

Nonstop3h 34m

Chicago O'Hare Intl

Tue 12/22

8:03 pm-12:29 am

Nonstop3h 26m

$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 $267, 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 $277.

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 $410. Flights from United States to Illinois on a Monday will generally be more expensive and average around $523. 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 $388. Flights at noon are often more expensive with an average ticket price of $554.

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 $261 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 $177 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	$82
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 $82. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $128.

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

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 November 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 21.72% of the total bookings. Other popular models include Airbus A321neo with 15.00%, Boeing 737-900 with 9.86%, and Boeing 737 MAX 9 with 7.19%.

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 5.5 2,512 reviews	Search Frontier flights
Delta	PriceFrom $74	Free Cancellation	Rating 7.8 8,698 reviews	Search Delta flights
JetBlue	PriceFrom $79	Free Cancellation	Rating 7.1 3,065 reviews	Search JetBlue flights
Contour	PriceFrom $118	Free Cancellation	Rating 7.6 44 reviews	Search Contour flights
Breeze Airways	PriceFrom $122	Free Cancellation	Rating 8.2 324 reviews	Search Breeze Airways flights
United Airlines	PriceFrom $136	Free Cancellation	Rating 7.3 10,462 reviews	Search United Airlines flights
American Airlines	PriceFrom $153	Free Cancellation	Rating 7.0 12,232 reviews	Search American Airlines flights
Southwest	PriceFrom $157	Free Cancellation	Rating 8.0 4,215 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $227	Free Cancellation	Rating 7.9 13,139 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.

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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 $68

Flights to Los Angelesfrom $38

Flights to Orlandofrom $62

Flights to Miamifrom $38

Flights to San Franciscofrom $38

Flights to Chicagofrom $78

Flights to Las Vegasfrom $38

Flights to Washington, D.C.from $46

Flights to Fort Lauderdalefrom $38

Flights to Bostonfrom $71

Flights to Atlantafrom $46

Flights to Dallasfrom $38

Cheap flights from the United States to Illinois from $82

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 1/19. 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

Trusted and free

Price Alerts

Price Alerts

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Contour flights from United States to Illinois

Our best Contour 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

Explore popular destinations other users love

According to popular flight searches on momondo this year