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Cheap flights from the United States to Illinois from $51

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 2/28. 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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0 bags

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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

Enter your travel dates to find the best prices.
Spirit Airlines Logo
9:05 am - 11:30 amDFW-ORD
2h 25mnonstop
Spirit Airlines Logo
3:26 pm - 10:54 pmORD-DFW
7h 28m1 stop
$102Spirit Airlines
Find Deal
Wed, Nov 5 - Sat, Nov 8
Frontier Logo
10:24 pm - 12:59 amDFW-ORD
2h 35mnonstop
Frontier Logo
6:20 pm - 9:09 pmORD-DFW
2h 49mnonstop
$103Frontier
Find Deal
Thu, Nov 6 - Fri, Nov 7
United Airlines Logo
7:22 pm - 8:57 pmLGA-ORD
2h 35mnonstop
United Airlines Logo
8:00 pm - 11:16 pmORD-LGA
2h 16mnonstop
$137United Airlines
Find Deal
Sat, Nov 1 - Tue, Nov 4
American Airlines Logo
7:30 am - 9:11 amLGA-ORD
2h 41mnonstop
American Airlines Logo
7:35 am - 10:44 amORD-LGA
2h 09mnonstop
$138American Airlines
Find Deal
Thu, Oct 30 - Mon, Nov 3
United Airlines Logo
9:01 am - 10:45 amEWR-ORD
2h 44mnonstop
United Airlines Logo
7:15 am - 10:25 amORD-EWR
2h 10mnonstop
$144United Airlines
Find Deal
Thu, Oct 30 - Mon, Nov 3
American Airlines Logo
3:44 pm - 5:45 pmJFK-ORD
3h 01mnonstop
American Airlines Logo
11:48 am - 2:58 pmORD-JFK
2h 10mnonstop
$153American Airlines
Find Deal
Fri, Nov 14 - Tue, Nov 18
Alaska Airlines Logo
5:50 pm - 11:59 pmSEA-ORD
4h 09mnonstop
Alaska Airlines Logo
6:00 am - 8:45 amORD-SEA
4h 45mnonstop
$197Alaska Airlines
Find Deal
Wed, Dec 3 - Sat, Jan 3
Alaska Airlines Logo
7:40 pm - 5:01 amSEA-ORD
7h 21m1 stop
Alaska Airlines Logo
8:59 pm - 9:25 amORD-SEA
14h 26m1 stop
$206Alaska Airlines
Find Deal
Sat, Nov 8 - Tue, Nov 11
Delta Logo
5:55 pm - 11:50 pmSEA-ORD
3h 55mnonstop
Delta Logo
7:50 am - 2:45 pmORD-SEA
8h 55m1 stop
$228Delta
Find Deal
Fri, Oct 31 - Thu, Nov 6
Delta Logo
7:25 am - 9:43 pmSEA-ORD
12h 18m2 stops
Delta Logo
7:20 am - 2:59 pmORD-SEA
9h 39m1 stop
$246Delta
Find Deal
Wed, Nov 5 - Sun, Nov 9

Spirit Airlines flights from United States to Illinois

Our best Spirit Airlines deals on United States to Illinois flight tickets
Spirit Airlines
Nov 5
DFW9:05 amDallas/Fort Worth
2h 25m
ORD11:30 amChicago O'Hare Intl
Nov 8
ORD3:26 pmChicago O'Hare Intl
7h 28m
1 stop
DFW10:54 pmDallas/Fort Worth
$102
Find similar
Spirit Airlines
Dec 13
DFW1:22 pmDallas/Fort Worth
2h 25m
ORD3:47 pmChicago O'Hare Intl
Dec 15
ORD5:22 pmChicago O'Hare Intl
2h 42m
DFW8:04 pmDallas/Fort Worth
$105
Find similar
Spirit Airlines
Oct 31
DFW8:10 amDallas/Fort Worth
13h 23m
1 stop
ORD9:33 pmChicago O'Hare Intl
Nov 5
ORD1:48 pmChicago O'Hare Intl
2h 33m
DFW4:21 pmDallas/Fort Worth
$106
Find similar

United Airlines flights from United States to Illinois

Our best United Airlines deals on United States to Illinois flight tickets
United Airlines
Nov 1
LGA7:22 pmNew York LaGuardia
2h 35m
ORD8:57 pmChicago O'Hare Intl
Nov 4
ORD8:00 pmChicago O'Hare Intl
2h 16m
LGA11:16 pmNew York LaGuardia
$137
Find similar
United Airlines
Oct 25
LGA8:25 amNew York LaGuardia
2h 37m
ORD10:02 amChicago O'Hare Intl
Oct 27
ORD10:00 amChicago O'Hare Intl
2h 11m
LGA1:11 pmNew York LaGuardia
$139
Find similar
United Airlines
Oct 30
EWR9:01 amNewark
2h 44m
ORD10:45 amChicago O'Hare Intl
Nov 3
ORD7:15 amChicago O'Hare Intl
2h 10m
EWR10:25 amNewark
$144
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from United States to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated October 17, 2025.
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

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Wed 11/5

9:05 am-11:30 am

Nonstop2h 25m

Chicago O'Hare Intl

Sat 11/8

3:26 pm-10:54 pm

1 stop7h 28m

$102

DallasChicago

DFW - ORD

DFWORD

Dallas/Fort Worth

Thu 11/6

10:24 pm-12:59 am

Nonstop2h 35m

Chicago O'Hare Intl

Fri 11/7

6:20 pm-9:09 pm

Nonstop2h 49m

$103

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Sat 11/1

7:22 pm-8:57 pm

Nonstop2h 35m

Chicago O'Hare Intl

Tue 11/4

8:00 pm-11:16 pm

Nonstop2h 16m

$137

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Thu 10/30

7:30 am-9:11 am

Nonstop2h 41m

Chicago O'Hare Intl

Mon 11/3

7:35 am-10:44 am

Nonstop2h 09m

$138

NewarkChicago

EWR - ORD

EWRORD

Newark

Thu 10/30

9:01 am-10:45 am

Nonstop2h 44m

Chicago O'Hare Intl

Mon 11/3

7:15 am-10:25 am

Nonstop2h 10m

$144

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Fri 11/14

3:44 pm-5:45 pm

Nonstop3h 01m

Chicago O'Hare Intl

Tue 11/18

11:48 am-2:58 pm

Nonstop2h 10m

$153

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 12/3

5:50 pm-11:59 pm

Nonstop4h 09m

Chicago O'Hare Intl

Sat 1/3

6:00 am-8:45 am

Nonstop4h 45m

$197

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 11/8

7:40 pm-5:01 am

1 stop7h 21m

Chicago O'Hare Intl

Tue 11/11

8:59 pm-9:25 am

1 stop14h 26m

$206

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 10/31

5:55 pm-11:50 pm

Nonstop3h 55m

Chicago O'Hare Intl

Thu 11/6

7:50 am-2:45 pm

1 stop8h 55m

$228

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 11/5

7:25 am-9:43 pm

2 stops12h 18m

Chicago O'Hare Intl

Sun 11/9

7:20 am-2:59 pm

1 stop9h 39m

$246

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

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?

The cheapest month to fly to Illinois from United States is in January. Flight prices, which tend to average around $185, 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 $359. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $452. 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 $280. Flights at noon are often more expensive with an average ticket price of $456.

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 $252 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 $185 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

$43

Fastest flight time

2h 04m

Direct flights

Every day

Airports in Illinois

1 airport
The best one-way flight to Illinois from United States in the past 72 hours is $43. The best round-trip flight deal from United States to Illinois found on momondo in the last 72 hours is $76.
The fastest flight from United States to Illinois takes 2h 04m
Direct flights go from United States to Illinois every day.
There is 1 airport near Illinois: 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?

  • 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?

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
Spirit AirlinesPriceFrom $59Free CancellationRating
6.3
8,102 reviews
Search Spirit Airlines flights
FrontierPriceFrom $59Free CancellationRating
5.8
3,134 reviews
Search Frontier flights
Allegiant AirPriceFrom $77Free CancellationRating
7.2
695 reviews
Search Allegiant Air flights
JetBluePriceFrom $80Free CancellationRating
7.2
2,907 reviews
Search JetBlue flights
DeltaPriceFrom $101Free CancellationRating
7.9
7,974 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $108Free CancellationRating
7.8
2,782 reviews
Search Hawaiian Airlines flights
Breeze AirwaysPriceFrom $109Free CancellationRating
8.1
217 reviews
Search Breeze Airways flights
SouthwestPriceFrom $117Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
Sun Country AirPriceFrom $130Free CancellationRating
6.9
335 reviews
Search Sun Country Air flights
United AirlinesPriceFrom $133Free CancellationRating
7.4
8,987 reviews
Search United 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.

An easier way to manage your Illinois trip

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