Illinois Flights - Book Cheap Flights to Illinois

View RM911 flight on Sat, 28 Mar 2026Opens in a new window

Popular airlines to Illinois

  • Delta

  • Frontier Airlines

  • American Airlines

  • United

  • Southwest Airlines

  • Spirit Airlines

  • Alaska Airlines

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap round-trip flights to Illinois

Prices were available within the past 7 days and start at RM911 for one-way flights and RM1,690 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM1,690 Return, just found
RM1,690
Return
just found
Select United flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM1,690 just found
Delta
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM1,764 Return, just found
RM1,764
Return
just found
Select Delta flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM1,764 just found
Delta
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM1,766 Return, just found
RM1,766
Return
just found
Select Delta flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM1,766 just found
United
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM1,848 Return, just found
RM1,848
Return
just found
Select United flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM1,848 just found
United
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM1,849 Return, just found
RM1,849
Return
just found
Select United flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM1,849 just found
Delta
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM1,905 Return, just found
RM1,905
Return
just found
Select Delta flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM1,905 just found
Delta
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM1,978 Return, just found
RM1,978
Return
just found
Select Delta flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM1,978 just found
American Airlines
Sun, 29 Mar - Sun, 5 Apr
BWI
Baltimore
PIA
Peoria
RM2,062 Return, found 1 hour ago
RM2,062
Return
found 1 hour ago
Select American Airlines flight, departing Sun, 29 Mar from Baltimore to Peoria, returning Sun, 5 Apr, priced at RM2,062 found 1 hour ago
Delta
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM2,083 Return, just found
RM2,083
Return
just found
Select Delta flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM2,083 just found
United
Sat, 28 Mar - Sat, 4 Apr
BWI
Baltimore
STL
St. Louis
RM2,122 Return, just found
RM2,122
Return
just found
Select United flight, departing Sat, 28 Mar from Baltimore to St. Louis, returning Sat, 4 Apr, priced at RM2,122 just found

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
Fri, 22 Jan - Sun, 31 Jan
KUL
Kuala Lumpur
ORD
Chicago
RM4,223 Return, found 4 days ago
RM4,223
Return
found 4 days ago
Select Turkish Airlines flight, departing Fri, 22 Jan from Kuala Lumpur to Chicago, returning Sun, 31 Jan, priced at RM4,223 found 4 days ago

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 RM1,690. 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 RM1,690 and RM4,223. Many lucky travellers nabbed one-way tickets from Baltimore (BWI) for as little as RM911.
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 RM1,690 to RM4,223.
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.

Book with confidence

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.
About Illinois

Explore a world of travel with Expedia

*Available to Expedia members.