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

Frontier, Spirit Airlines, and Southwest 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 2025, 439 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.

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 45m 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 52m.

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

The number of flights available between United States and Illinois is 3,078 per week as of November 2025. The most frequent departure day is Thu, with 18% 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 2025, there are 10 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 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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Direct

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

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6:00 am - 11:54 amDFW-ORD

5h 54m1 stop

4:49 pm - 7:29 pmORD-DFW

2h 40mnonstop

$92Multiple Airlines

Find Deal

Sat, Dec 6 - Thu, Dec 11

5:25 am - 7:43 amDFW-ORD

2h 18mnonstop

3:26 pm - 11:12 pmORD-DFW

7h 46m1 stop

$93Spirit Airlines

Find Deal

Tue, Dec 2 - Sat, Dec 6

10:24 pm - 12:59 amDFW-ORD

2h 35mnonstop

8:59 am - 11:46 amORD-DFW

2h 47mnonstop

$94Frontier

Find Deal

Wed, Nov 12 - Sun, Nov 23

1:00 pm - 2:57 pmJFK-ORD

2h 57mnonstop

11:44 am - 12:59 amORD-JFK

12h 15m1 stop

$95Frontier

Find Deal

Fri, Dec 5 - Mon, Dec 8

5:29 pm - 7:23 pmJFK-ORD

2h 54mnonstop

10:06 am - 1:29 pmORD-JFK

2h 23mnonstop

$115American Airlines

Find Deal

Thu, Dec 4 - Wed, Dec 10

4:30 pm - 6:55 pmDFW-ORD

2h 25mnonstop

8:14 pm - 10:59 pmORD-DFW

2h 45mnonstop

$117United Airlines

Find Deal

Sat, Jan 10 - Tue, Jan 13

6:05 am - 7:30 amICT-STL

1h 25mnonstop

8:40 pm - 10:05 pmSTL-ICT

1h 25mnonstop

$117Southwest

Find Deal

Wed, Dec 3 - Wed, Dec 10

9:01 am - 10:45 amEWR-ORD

2h 44mnonstop

4:25 pm - 7:48 pmORD-EWR

2h 23mnonstop

$126United Airlines

Find Deal

Mon, Nov 24 - Wed, Dec 3

4:05 pm - 5:25 pmICT-STL

1h 20mnonstop

1:45 pm - 7:20 pmSTL-ICT

5h 35m1 stop

$127Southwest

Find Deal

Wed, Dec 3 - Wed, Dec 10

7:26 am - 11:10 amDEN-ORD

2h 44mnonstop

8:25 pm - 10:20 pmORD-DEN

2h 55mnonstop

$134American Airlines

Find Deal

Thu, Dec 4 - Mon, Dec 8

Spirit Airlines flights from United States to Illinois

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

Spirit Airlines

Dec 2

DFW5:25 amDallas/Fort Worth

2h 18m

ORD7:43 amChicago O'Hare Intl

Dec 6

ORD3:26 pmChicago O'Hare Intl

7h 46m

1 stop

DFW11:12 pmDallas/Fort Worth

$93

Find similar

Spirit Airlines

Dec 13

LGA8:41 pmNew York LaGuardia

2h 30m

ORD10:11 pmChicago O'Hare Intl

Dec 15

ORD4:38 pmChicago O'Hare Intl

2h 04m

LGA7:42 pmNew York LaGuardia

$95

Find similar

Spirit Airlines

Dec 31

LGA8:37 pmNew York LaGuardia

2h 30m

ORD10:07 pmChicago O'Hare Intl

Jan 24

ORD6:19 pmChicago O'Hare Intl

2h 10m

LGA9:29 pmNew York LaGuardia

$96

Find similar

Frontier flights from United States to Illinois

Our best Frontier deals on United States to Illinois flight tickets

Frontier

Nov 11

DFW10:24 pmDallas/Fort Worth

2h 35m

ORD12:59 amChicago O'Hare Intl

Nov 12

ORD6:25 pmChicago O'Hare Intl

2h 49m

DFW9:14 pmDallas/Fort Worth

$93

Find similar

Frontier

Nov 12

DFW10:24 pmDallas/Fort Worth

2h 35m

ORD12:59 amChicago O'Hare Intl

Nov 23

ORD8:59 amChicago O'Hare Intl

2h 47m

DFW11:46 amDallas/Fort Worth

$94

Find similar

Frontier

Dec 18

DFW4:10 pmDallas/Fort Worth

2h 42m

ORD6:52 pmChicago O'Hare Intl

Dec 21

ORD9:34 pmChicago O'Hare Intl

2h 46m

DFW12:20 amDallas/Fort Worth

$95

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Sat 12/6

6:00 am-11:54 am

1 stop5h 54m

Chicago O'Hare Intl

Thu 12/11

4:49 pm-7:29 pm

Nonstop2h 40m

$92

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Tue 12/2

5:25 am-7:43 am

Nonstop2h 18m

Chicago O'Hare Intl

Sat 12/6

3:26 pm-11:12 pm

1 stop7h 46m

$93

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Wed 11/12

10:24 pm-12:59 am

Nonstop2h 35m

Chicago O'Hare Intl

Sun 11/23

8:59 am-11:46 am

Nonstop2h 47m

$94

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Fri 12/5

1:00 pm-2:57 pm

Nonstop2h 57m

Chicago O'Hare Intl

Mon 12/8

11:44 am-12:59 am

1 stop12h 15m

$95

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Thu 12/4

5:29 pm-7:23 pm

Nonstop2h 54m

Chicago O'Hare Intl

Wed 12/10

10:06 am-1:29 pm

Nonstop2h 23m

$115

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Sat 1/10

4:30 pm-6:55 pm

Nonstop2h 25m

Chicago O'Hare Intl

Tue 1/13

8:14 pm-10:59 pm

Nonstop2h 45m

$117

WichitaSt. Louis

ICT - STL

ICTSTL

Wichita Eisenhower National

Wed 12/3

6:05 am-7:30 am

Nonstop1h 25m

Lambert-St Louis

Wed 12/10

8:40 pm-10:05 pm

Nonstop1h 25m

$117

NewarkChicago

EWR - ORD

EWRORD

Newark

Mon 11/24

9:01 am-10:45 am

Nonstop2h 44m

Chicago O'Hare Intl

Wed 12/3

4:25 pm-7:48 pm

Nonstop2h 23m

$126

WichitaSt. Louis

ICT - STL

ICTSTL

Wichita Eisenhower National

Wed 12/3

4:05 pm-5:25 pm

Nonstop1h 20m

Lambert-St Louis

Wed 12/10

1:45 pm-7:20 pm

1 stop5h 35m

$127

DenverChicago

DEN - ORD

DENORD

Denver Intl

Thu 12/4

7:26 am-11:10 am

Nonstop2h 44m

Chicago O'Hare Intl

Mon 12/8

8:25 pm-10:20 pm

Nonstop2h 55m

$134

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 $184, 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	$49
Fastest flight time	1h 20m
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 $49. 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 1h 20m

Direct flights go from United States to Illinois every day.

There are 2 airports near Illinois: Chicago O'Hare Intl (ORD), Lambert-St Louis (STL)

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 10 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 22.45% of the total bookings. Other popular models include Boeing 737-900 with 10.94%, Airbus A321neo with 10.78%, and Boeing 737 MAX 8 with 7.48%.

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 $55	Free Cancellation	Rating 5.8 3,116 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $59	Free Cancellation	Rating 6.3 8,114 reviews	Search Spirit Airlines flights
Allegiant Air	PriceFrom $77	Free Cancellation	Rating 7.2 697 reviews	Search Allegiant Air flights
JetBlue	PriceFrom $79	Free Cancellation	Rating 7.2 2,907 reviews	Search JetBlue flights
Delta	PriceFrom $101	Free Cancellation	Rating 7.9 8,001 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,804 reviews	Search Hawaiian Airlines flights
Southwest	PriceFrom $117	Free Cancellation	Rating 8.0 4,240 reviews	Search Southwest flights
Breeze Airways	PriceFrom $121	Free Cancellation	Rating 8.1 225 reviews	Search Breeze Airways flights
United Airlines	PriceFrom $126	Free Cancellation	Rating 7.4 9,003 reviews	Search United Airlines flights
Sun Country Air	PriceFrom $130	Free Cancellation	Rating 6.9 335 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.

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.

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Find better results for your trip to Illinois

Popular cities in Illinois

Flights to New Yorkfrom $44

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Flights to Chicagofrom $54

Flights to Orlandofrom $49

Flights to Las Vegasfrom $42

Flights to San Franciscofrom $57

Flights to Washington, D.C.from $49

Flights to Bostonfrom $49

Flights to Atlantafrom $40

Flights to Dallasfrom $59

Flights to Seattlefrom $58

Cheap flights from the United States to Illinois from $46

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 12/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

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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

Spirit Airlines flights from United States to Illinois

Our best Spirit Airlines 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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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

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?

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?

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.

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

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

What airlines fly to Illinois?

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

As of November 2025, 439 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 3,078 per week as of November 2025. The most frequent departure day is Thu, with 18% of weekly flights leaving on this day.

How long is the flight from 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

Fastest flight time

Direct flights

Airports in Illinois

When did momondo last update prices for flights from United States to Illinois?

How many operators does momondo search for flights from United States to Illinois?

How old do you have to be to fly from United States to Illinois?

What documentation or ID do you need to fly to Illinois?

What is the most popular plane model from 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?

Why should I use momondo to find a flight deal from United States to Illinois?

Can I find flights from United States to Illinois with flexible booking policies on momondo?

How can momondo help me find flights from United States to Illinois?

I’m not ready to book a flight from United States to Illinois right now. Can momondo alert me if prices change?

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