Illinois Flights - Book Cheap Flights to Illinois

View RM644 flight on Thu, 29 Jan 2026Opens in a new window

Popular airlines to Illinois

  • Delta

    Delta

  • American Airlines

    American Airlines

  • Frontier Airlines

    Frontier Airlines

  • United

    United

  • Southwest Airlines

    Southwest Airlines

  • Spirit Airlines

    Spirit Airlines

  • JetBlue Airways

    JetBlue Airways

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Cheap round-trip flights to Illinois

Prices were available within the past 7 days and start at RM644 for one-way flights and RM1,390 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,390 Return, found 6 hours ago
RM1,390
Return
found 6 hours ago
Select Delta flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,390 found 6 hours ago
American Airlines
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,492 Return, found 6 hours ago
RM1,492
Return
found 6 hours ago
Select American Airlines flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,492 found 6 hours ago
United
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,492 Return, found 6 hours ago
RM1,492
Return
found 6 hours ago
Select United flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,492 found 6 hours ago
Delta
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
MDW
Chicago
RM1,504 Return, found 6 hours ago
RM1,504
Return
found 6 hours ago
Select Delta flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,504 found 6 hours ago
United
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,533 Return, found 6 hours ago
RM1,533
Return
found 6 hours ago
Select United flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,533 found 6 hours ago
Delta
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,534 Return, found 6 hours ago
RM1,534
Return
found 6 hours ago
Select Delta flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,534 found 6 hours ago
American Airlines
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,574 Return, found 6 hours ago
RM1,574
Return
found 6 hours ago
Select American Airlines flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,574 found 6 hours ago
Delta
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,657 Return, found 6 hours ago
RM1,657
Return
found 6 hours ago
Select Delta flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,657 found 6 hours ago
Delta
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,668 Return, found 6 hours ago
RM1,668
Return
found 6 hours ago
Select Delta flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,668 found 6 hours ago
Delta
Thu, 29 Jan - Thu, 5 Feb
COS
Colorado Springs
ORD
Chicago
RM1,677 Return, found 6 hours ago
RM1,677
Return
found 6 hours ago
Select Delta flight, departing Thu, 29 Jan from Colorado Springs to Chicago, returning Thu, 5 Feb, priced at RM1,677 found 6 hours ago

About Illinois

Expedia offers flights to Illinois to meet every traveler's needs. Whatever your flight need - Expedia has the flight for you. So choose from flights to Illinois or destinations around the world and discover how easy it is to make your flight reservations on Expedia.

Frequently asked questions

How do I find cheap flights to Illinois that have flexible change policies?
Search for cheap flights to Illinois, then tick the "No change fee" box under the "Flexible change policies" heading. From then on it's smooth sailing. We understand that travel plans change and flexibility is essential, so book with confidence with Expedia.
Which airlines fly to Illinois?
Whether you're travelling somewhere new or rendezvousing at a favourite haunt, these airlines are waiting to take you into or near Illinois:

  • United Airlines - 13,063 flights to or near Illinois each month, including 12,950 flights to O'Hare Intl. Airport (ORD) and 108 flights to Quad City Intl. Airport (MLI) per month.
  • American Airlines - 8,977 flights to or near Illinois each month, including 8,855 flights to O'Hare Intl. Airport (ORD) and 121 flights to Quad City Intl. Airport (MLI) per month.
  • Southwest Airlines - 5,997 flights to or near Illinois each month, including 5,334 flights to Midway Intl. Airport (MDW) and 663 flights to O'Hare Intl. Airport (ORD) per month.

How can I find cheap tickets to Illinois?
One of the easiest ways to find cheap tickets to Illinois is to be flexible with your travel dates. Search for your flights, then click "flexible dates" at the top of your results. It'll reveal the cheapest prices for nearby days. The lowest price for a flight to Illinois in the last seven days was RM1,390. Booking well in advance will generally help you score an even bigger bargain.
How much is a flight to Illinois?
There were plenty of bargain fares up for grabs in the last seven days, with the cost of a return airfare to Illinois ranging between RM1,390 and RM4,010. Many lucky travellers nabbed one-way tickets from Colorado Springs (COS) for as little as RM644.
What are the most popular airports to fly into in Illinois?
Touch down at one of these top Illinois airports and you'll be perfectly placed to discover all that this wonderful region has to offer:

  • O'Hare Intl. Airport (ORD) - 25,318 flights per month.
  • Midway Intl. Airport (MDW) - 5,962 flights per month.
  • Quad City Intl. Airport (MLI) - 325 flights per month.

How much is a plane ticket to Illinois?
In the last seven days, plane fares to Illinois ranged from RM1,390 to RM4,010.
What is the best time to go to Illinois?
A terrific time to check out Chicago is after June 20 when the summer season starts. In Illinois's main city, average temperatures range from 18ºC to 24ºC at this time — ideal weather for sightseeing! May, June and August are the most popular months to head to this hot spot.
What months are the cheapest to book a flight to Illinois?
The top month to purchase affordable flights to Illinois is February. Remember that in the U.S, an expensive time to reserve a ticket is during the busy month of December.

Trending flights to Illinois

These prices were available within the past 7 days. Prices quoted are per person, return, for the period specified. Prices and availability are subject to change. Additional terms apply.

Turkish Airlines
Tue, 3 Feb - Thu, 12 Feb
KUL
Kuala Lumpur
ORD
Chicago
RM4,010 Return, found 6 days ago
RM4,010
Return
found 6 days ago
Select Turkish Airlines flight, departing Tue, 3 Feb from Kuala Lumpur to Chicago, returning Thu, 12 Feb, priced at RM4,010 found 6 days ago
*Available to Expedia members.