Cheap Flights to Illinois from ₩671,900

View ₩671,900 flight on Sun, Oct 11, 2026Opens in a new window

Popular airlines to Illinois

  • Delta

  • American Airlines

  • Frontier Airlines

  • United

  • Spirit Airlines

  • Southwest Airlines

  • Alaska Airlines

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 40% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

How much is the cheapest flight to Illinois?

Prices were available within the past 7 days and start at ₩671,900 for one-way flights and ₩947,200 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Mon, Jun 1 - Mon, Jun 8
ICN
Seoul
ORD
Chicago
₩947,200 Roundtrip, found 5 days ago
₩947,200
Roundtrip
found 5 days ago
Select Air Canada flight, departing Mon, Jun 1 from Seoul to Chicago, returning Mon, Jun 8, priced at ₩947,200 found 5 days ago
Air Canada
Tue, May 12 - Wed, Sep 2
ICN
Seoul
STL
St. Louis
₩1,016,500 Roundtrip, found 6 days ago
₩1,016,500
Roundtrip
found 6 days ago
Select Air Canada flight, departing Tue, May 12 from Seoul to St. Louis, returning Wed, Sep 2, priced at ₩1,016,500 found 6 days ago
American Airlines
Mon, Feb 23 - Sun, Mar 1
ICN
Seoul
STL
St. Louis
₩1,241,600 Roundtrip, found 1 day ago
₩1,241,600
Roundtrip
found 1 day ago
Select American Airlines flight, departing Mon, Feb 23 from Seoul to St. Louis, returning Sun, Mar 1, priced at ₩1,241,600 found 1 day ago
Hawaiian Airlines
Thu, Feb 26 - Wed, Mar 4
ICN
Seoul
ORD
Chicago
₩1,344,600 Roundtrip, found 1 day ago
₩1,344,600
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Thu, Feb 26 from Seoul to Chicago, returning Wed, Mar 4, priced at ₩1,344,600 found 1 day ago
Alaska Airlines
Mon, Mar 9 - Wed, Mar 18
ICN
Seoul
ORD
Chicago
₩1,345,900 Roundtrip, found 10 hours ago
₩1,345,900
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Mon, Mar 9 from Seoul to Chicago, returning Wed, Mar 18, priced at ₩1,345,900 found 10 hours ago
EVA Airways
Wed, Apr 22 - Sun, Apr 26
ICN
Seoul
ORD
Chicago
₩1,471,700 Roundtrip, found 16 hours ago
₩1,471,700
Roundtrip
found 16 hours ago
Select EVA Airways flight, departing Wed, Apr 22 from Seoul to Chicago, returning Sun, Apr 26, priced at ₩1,471,700 found 16 hours ago
LOT-Polish Airlines
Tue, Dec 1 - Tue, Dec 8
ICN
Seoul
ORD
Chicago
₩1,487,000 Roundtrip, found 4 hours ago
₩1,487,000
Roundtrip
found 4 hours ago
Select LOT-Polish Airlines flight, departing Tue, Dec 1 from Seoul to Chicago, returning Tue, Dec 8, priced at ₩1,487,000 found 4 hours ago
American Airlines
Wed, Feb 11 - Mon, Feb 16
ICN
Seoul
PIA
Peoria
₩1,507,900 Roundtrip, found 5 hours ago
₩1,507,900
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Wed, Feb 11 from Seoul to Peoria, returning Mon, Feb 16, priced at ₩1,507,900 found 5 hours ago
United
Tue, Sep 1 - Tue, Oct 13
ICN
Seoul
ORD
Chicago
₩1,534,600 Roundtrip, found 2 days ago
₩1,534,600
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep 1 from Seoul to Chicago, returning Tue, Oct 13, priced at ₩1,534,600 found 2 days ago
Cathay Pacific
Tue, Feb 17 - Fri, Mar 6
ICN
Seoul
ORD
Chicago
₩1,651,300 Roundtrip, found 4 days ago
₩1,651,300
Roundtrip
found 4 days ago
Select Cathay Pacific flight, departing Tue, Feb 17 from Seoul to Chicago, returning Fri, Mar 6, priced at ₩1,651,300 found 4 days 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 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 ₩947,200. 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 ₩947,200 and ₩1,651,300. Many lucky travelers nabbed one-way tickets from Seoul (ICN) for as little as ₩671,900.
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 ₩947,200 to ₩1,651,300.
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.

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.

Air Canada
Mon, Jun 1 - Mon, Jun 8
ICN
Seoul
ORD
Chicago
₩947,200 Roundtrip, found 5 days ago
₩947,200
Roundtrip
found 5 days ago
Select Air Canada flight, departing Mon, Jun 1 from Seoul to Chicago, returning Mon, Jun 8, priced at ₩947,200 found 5 days ago
*Available to Expedia members.