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

United Airlines, American Airlines, and Frontier 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 August 2026, 465 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 39% 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 43m 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 47m.

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

The number of flights available between United States and Illinois is 3,259 per week as of August 2026. The most frequent departure day is Fri, with 19% of weekly flights leaving on this day.

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 37% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 12 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 August 2026, there are 9 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.

$46 Cheap Flights from the United States to Illinois in 2026

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.

11:28 am - 8:28 pm

BOS

ORD

10h 00m

1 stop

9:33 pm - 10:52 am

ORD

BOS

12h 19m

1 stop

$161Frontier

Wed, Oct 21 - Fri, Oct 23

12:45 pm - 8:08 pm

BOS

ORD

8h 23m

1 stop

9:10 pm - 9:09 am

ORD

BOS

10h 59m

1 stop

$161Frontier

Wed, Sep 2 - Fri, Sep 4

4:47 pm - 6:24 pm

PHL

ORD

2h 37mnonstop

9:38 am - 5:59 pm

ORD

PHL

7h 21m

1 stop

$184Multiple Airlines

Sun, Oct 18 - Fri, Oct 23

6:00 am - 7:29 am

PHL

ORD

2h 29mnonstop

11:01 am - 8:01 pm

ORD

PHL

8h 00m

1 stop

$189Multiple Airlines

Mon, Aug 24 - Mon, Aug 24

12:29 pm - 4:51 pm

DCA

ORD

5h 22m

1 stop

1:55 pm - 6:37 pm

ORD

DCA

3h 42m

1 stop

$197Delta

Sat, Sep 5 - Fri, Sep 11

6:00 am - 12:13 pm

DCA

ORD

7h 13m

1 stop

5:29 pm - 11:07 pm

ORD

DCA

4h 38m

1 stop

$197Delta

Sat, Oct 24 - Sat, Oct 24

6:55 am - 8:49 am

BOS

ORD

2h 54mnonstop

1:00 pm - 8:49 pm

ORD

BOS

6h 49m

1 stop

$199JetBlue

Tue, Oct 6 - Thu, Oct 8

3:30 pm - 4:52 pm

DCA

ORD

2h 22mnonstop

6:00 am - 8:55 am

ORD

DCA

1h 55mnonstop

$200United Airlines

Wed, Sep 2 - Mon, Sep 7

7:10 pm - 8:30 pm

DCA

ORD

2h 20mnonstop

6:00 am - 8:55 am

ORD

DCA

1h 55mnonstop

$200United Airlines

Sat, Sep 5 - Mon, Sep 7

5:00 pm - 7:01 pm

BOS

ORD

3h 01mnonstop

7:00 am - 3:14 pm

ORD

BOS

7h 14m

1 stop

$203JetBlue

Sat, Sep 12 - Sun, Sep 13

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Delta flights from United States to Illinois

Our best Delta deals on United States to Illinois flight tickets

Delta

Sep 5

DCA12:33 pmWashington, D.C. Reagan-National

4h 44m

1 stop

ORD4:17 pmChicago O'Hare Intl

Sep 12

ORD10:25 amChicago O'Hare Intl

5h 07m

1 stop

DCA4:32 pmWashington, D.C. Reagan-National

$197

Delta

Sep 5

DCA6:30 pmWashington, D.C. Reagan-National

6h 27m

1 stop

ORD11:57 pmChicago O'Hare Intl

Sep 6

ORD6:40 amChicago O'Hare Intl

5h 05m

1 stop

DCA12:45 pmWashington, D.C. Reagan-National

$202

Delta

Aug 26

JFK7:33 amNew York John F Kennedy Intl

2h 54m

ORD9:27 amChicago O'Hare Intl

Aug 29

ORD6:00 pmChicago O'Hare Intl

2h 37m

JFK9:37 pmNew York John F Kennedy Intl

$207

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Oct 21

BOS11:28 amBoston Logan Intl

10h 00m

1 stop

ORD8:28 pmChicago O'Hare Intl

Oct 23

ORD9:33 pmChicago O'Hare Intl

12h 19m

1 stop

BOS10:52 amBoston Logan Intl

$161

Frontier

Aug 29

BOS12:45 pmBoston Logan Intl

8h 23m

1 stop

ORD8:08 pmChicago O'Hare Intl

Sep 5

ORD7:44 pmChicago O'Hare Intl

12h 25m

1 stop

BOS9:09 amBoston Logan Intl

$166

Frontier

Aug 29

BOS12:45 pmBoston Logan Intl

8h 23m

1 stop

ORD8:08 pmChicago O'Hare Intl

Sep 5

ORD7:44 pmChicago O'Hare Intl

12h 25m

1 stop

BOS9:09 amBoston Logan Intl

$167

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Wed 10/21

11:28 am-8:28 pm

1 stop10h 00m

Chicago O'Hare Intl

Fri 10/23

9:33 pm-10:52 am

1 stop12h 19m

$161

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Wed 9/2

12:45 pm-8:08 pm

1 stop8h 23m

Chicago O'Hare Intl

Fri 9/4

9:10 pm-9:09 am

1 stop10h 59m

$161

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sun 10/18

4:47 pm-6:24 pm

Nonstop2h 37m

Chicago O'Hare Intl

Fri 10/23

9:38 am-5:59 pm

1 stop7h 21m

$184

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Mon 8/24

6:00 am-7:29 am

Nonstop2h 29m

Chicago O'Hare Intl

Mon 8/24

11:01 am-8:01 pm

1 stop8h 00m

$189

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Sat 9/5

12:29 pm-4:51 pm

1 stop5h 22m

Chicago O'Hare Intl

Fri 9/11

1:55 pm-6:37 pm

1 stop3h 42m

$197

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Sat 10/24

6:00 am-12:13 pm

1 stop7h 13m

Chicago O'Hare Intl

Sat 10/24

5:29 pm-11:07 pm

1 stop4h 38m

$197

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Tue 10/6

6:55 am-8:49 am

Nonstop2h 54m

Chicago O'Hare Intl

Thu 10/8

1:00 pm-8:49 pm

1 stop6h 49m

$199

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 9/2

3:30 pm-4:52 pm

Nonstop2h 22m

Chicago O'Hare Intl

Mon 9/7

6:00 am-8:55 am

Nonstop1h 55m

$200

Quickest round-trip

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Sat 9/5

7:10 pm-8:30 pm

Nonstop2h 20m

Chicago O'Hare Intl

Mon 9/7

6:00 am-8:55 am

Nonstop1h 55m

$200

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Sat 9/12

5:00 pm-7:01 pm

Nonstop3h 01m

Chicago O'Hare Intl

Sun 9/13

7:00 am-3:14 pm

1 stop7h 14m

$203

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 $258, 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 $272.

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 $402. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $494. 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 $352. Flights at noon are often more expensive with an average ticket price of $512.

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 $243 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	$52
Fastest flight time	0h 45m
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 $52. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $78.

The fastest flight from United States to Illinois takes 0h 45m

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 August 2026, there are 9 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 22.69% of the total bookings. Other popular models include Airbus A321neo with 14.19%, Boeing 737-900 with 11.02%, and Boeing 737 MAX 8 with 7.26%.

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 5.6 2,741 reviews	Search Frontier flights
JetBlue	PriceFrom $69	Free Cancellation	Rating 7.1 3,030 reviews	Search JetBlue flights
Delta	PriceFrom $74	Free Cancellation	Rating 7.8 8,492 reviews	Search Delta flights
Allegiant Air	PriceFrom $110	Free Cancellation	Rating 7.3 679 reviews	Search Allegiant Air flights
United Airlines	PriceFrom $126	Free Cancellation	Rating 7.4 10,062 reviews	Search United Airlines flights
Breeze Airways	PriceFrom $128	Free Cancellation	Rating 8.2 304 reviews	Search Breeze Airways flights
Southwest	PriceFrom $134	Free Cancellation	Rating 8.0 4,229 reviews	Search Southwest flights
American Airlines	PriceFrom $137	Free Cancellation	Rating 7.1 11,845 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $195	Free Cancellation	Rating 7.9 12,746 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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Popular cities in Illinois

Flights to New Yorkfrom $76

Flights to Los Angelesfrom $56

Flights to Orlandofrom $50

Flights to Miamifrom $54

Flights to Chicagofrom $58

Flights to San Franciscofrom $46

Flights to Las Vegasfrom $46

Flights to Washington, D.C.from $48

Flights to Bostonfrom $87

Flights to Atlantafrom $51

Flights to Fort Lauderdalefrom $46

Flights to Dallasfrom $61

Cheap flights from the United States to Illinois from $89

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 8/29. 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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Delta flights from United States to Illinois

Our best Delta deals on United States to Illinois flight tickets

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

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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

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According to popular flight searches on momondo this year

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