Cheap Flights to Illinois from ₩210,000

View ₩210,000 flight on Wed, Feb 25, 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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How much is the cheapest flight to Illinois?

Prices were available within the past 7 days and start at ₩210,000 for one-way flights and ₩418,800 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Thu, Feb 5 - Tue, Feb 10
ONT
Ontario
ORD
Chicago
₩418,800 Roundtrip, found 5 days ago
₩418,800
Roundtrip
found 5 days ago
Select Hawaiian Airlines flight, departing Thu, Feb 5 from Ontario to Chicago, returning Tue, Feb 10, priced at ₩418,800 found 5 days ago
Delta
Sat, Jan 10 - Mon, Jan 19
ONT
Ontario
STL
St. Louis
₩432,500 Roundtrip, found 1 day ago
₩432,500
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Jan 10 from Ontario to St. Louis, returning Mon, Jan 19, priced at ₩432,500 found 1 day ago
United
Sat, Jan 10 - Sun, Jan 18
ONT
Ontario
STL
St. Louis
₩565,600 Roundtrip, found 1 day ago
₩565,600
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jan 10 from Ontario to St. Louis, returning Sun, Jan 18, priced at ₩565,600 found 1 day ago
American Airlines
Sat, Jan 10 - Sat, Jan 17
ONT
Ontario
STL
St. Louis
₩606,700 Roundtrip, found 1 day ago
₩606,700
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Jan 10 from Ontario to St. Louis, returning Sat, Jan 17, priced at ₩606,700 found 1 day ago
American Airlines
Thu, Apr 9 - Wed, Apr 15
ICN
Seoul
ORD
Chicago
₩830,700 Roundtrip, found 3 days ago
₩830,700
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Apr 9 from Seoul to Chicago, returning Wed, Apr 15, priced at ₩830,700 found 3 days ago
Alaska Airlines
Mon, Mar 16 - Wed, Mar 25
ICN
Seoul
ORD
Chicago
₩846,100 Roundtrip, found 3 days ago
₩846,100
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Mon, Mar 16 from Seoul to Chicago, returning Wed, Mar 25, priced at ₩846,100 found 3 days ago
American Airlines
Tue, Feb 17 - Sat, Feb 28
ICN
Seoul
STL
St. Louis
₩871,500 Roundtrip, found 1 day ago
₩871,500
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Feb 17 from Seoul to St. Louis, returning Sat, Feb 28, priced at ₩871,500 found 1 day ago
American Airlines
Fri, Dec 26 - Mon, Jan 12
ICN
Seoul
CMI
Champaign
₩961,000 Roundtrip, found 3 days ago
₩961,000
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Dec 26 from Seoul to Champaign, returning Mon, Jan 12, priced at ₩961,000 found 3 days ago
American Airlines
Wed, Jan 14 - Sat, Jan 17
ICN
Seoul
MLI
Moline
₩1,086,300 Roundtrip, found 6 days ago
₩1,086,300
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Jan 14 from Seoul to Moline, returning Sat, Jan 17, priced at ₩1,086,300 found 6 days ago
Air Canada
Wed, Feb 4 - Tue, Jun 30
ICN
Seoul
ORD
Chicago
₩1,194,000 Roundtrip, found 2 days ago
₩1,194,000
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Feb 4 from Seoul to Chicago, returning Tue, Jun 30, priced at ₩1,194,000 found 2 days ago

Trending flights to Illinois

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

American Airlines
Thu, Apr 9 - Wed, Apr 15
ICN
Seoul
ORD
Chicago
₩830,700 Roundtrip, found 3 days ago
₩830,700
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Apr 9 from Seoul to Chicago, returning Wed, Apr 15, priced at ₩830,700 found 3 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 traveling somewhere new or rendezvousing at a favorite 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 ₩418,800. 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 ₩418,800 and ₩1,194,000. Many lucky travelers nabbed one-way tickets from Ontario (ONT) for as little as ₩210,000.
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.

When is the cheapest time to fly to Illinois?
Take off for Illinois early in the week and you'll usually be rewarded more economical fares. Tuesday is typically the cheapest day to hop on a plane, followed by Monday. If you're hoping to avoid the most expensive flights, steer clear of Saturdays.
How much is a plane ticket to Illinois?
In the last seven days, plane fares to Illinois ranged from ₩418,800 to ₩1,194,000.
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 65ºF to 75ºF 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

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About Illinois

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