Cheap Flights to Illinois from ₩635,600

View ₩635,600 flight on Fri, Mar 6, 2026Opens in a new window

Popular airlines to Illinois

  • Frontier Airlines

  • Delta

  • American Airlines

  • United

  • Southwest Airlines

  • Spirit Airlines

  • Alaska Airlines

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How much is the cheapest flight to Illinois?

Prices were available within the past 7 days and start at ₩635,600 for one-way flights and ₩1,133,700 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Sun, Mar 1 - Tue, Mar 10
ICN
Seoul
ORD
Chicago
₩1,133,700 Roundtrip, found 14 hours ago
₩1,133,700
Roundtrip
found 14 hours ago
Select Hawaiian Airlines flight, departing Sun, Mar 1 from Seoul to Chicago, returning Tue, Mar 10, priced at ₩1,133,700 found 14 hours ago
Alaska Airlines
Thu, Feb 19 - Fri, Feb 20
ICN
Seoul
ORD
Chicago
₩1,133,700 Roundtrip, found 2 days ago
₩1,133,700
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Feb 19 from Seoul to Chicago, returning Fri, Feb 20, priced at ₩1,133,700 found 2 days ago
United
Thu, Feb 26 - Sun, Mar 1
ICN
Seoul
ORD
Chicago
₩1,133,800 Roundtrip, just found
₩1,133,800
Roundtrip
just found
Select United flight, departing Thu, Feb 26 from Seoul to Chicago, returning Sun, Mar 1, priced at ₩1,133,800 just found
Air Canada
Wed, Mar 25 - Tue, Jul 21
ICN
Seoul
ORD
Chicago
₩1,175,000 Roundtrip, found 3 days ago
₩1,175,000
Roundtrip
found 3 days ago
Select Air Canada flight, departing Wed, Mar 25 from Seoul to Chicago, returning Tue, Jul 21, priced at ₩1,175,000 found 3 days ago
American Airlines
Fri, Feb 20 - Sun, Mar 1
ICN
Seoul
STL
St. Louis
₩1,240,700 Roundtrip, found 17 hours ago
₩1,240,700
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Fri, Feb 20 from Seoul to St. Louis, returning Sun, Mar 1, priced at ₩1,240,700 found 17 hours ago
Delta
Tue, Feb 24 - Tue, Mar 3
ICN
Seoul
STL
St. Louis
₩1,253,700 Roundtrip, found 2 days ago
₩1,253,700
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Feb 24 from Seoul to St. Louis, returning Tue, Mar 3, priced at ₩1,253,700 found 2 days ago
Korean Air
Tue, Mar 3 - Mon, Mar 9
ICN
Seoul
STL
St. Louis
₩1,353,700 Roundtrip, found 3 days ago
₩1,353,700
Roundtrip
found 3 days ago
Select Korean Air flight, departing Tue, Mar 3 from Seoul to St. Louis, returning Mon, Mar 9, priced at ₩1,353,700 found 3 days ago
EVA Airways
Thu, Sep 17 - Fri, Sep 25
ICN
Seoul
ORD
Chicago
₩1,467,900 Roundtrip, found 1 day ago
₩1,467,900
Roundtrip
found 1 day ago
Select EVA Airways flight, departing Thu, Sep 17 from Seoul to Chicago, returning Fri, Sep 25, priced at ₩1,467,900 found 1 day ago
All Nippon Airways
Tue, Sep 22 - Sun, Sep 27
GMP
Seoul
ORD
Chicago
₩1,622,000 Roundtrip, found 4 days ago
₩1,622,000
Roundtrip
found 4 days ago
Select All Nippon Airways flight, departing Tue, Sep 22 from Seoul to Chicago, returning Sun, Sep 27, priced at ₩1,622,000 found 4 days ago
LOT-Polish Airlines
Mon, Apr 20 - Tue, Apr 28
ICN
Seoul
ORD
Chicago
₩1,627,300 Roundtrip, found 1 day ago
₩1,627,300
Roundtrip
found 1 day ago
Select LOT-Polish Airlines flight, departing Mon, Apr 20 from Seoul to Chicago, returning Tue, Apr 28, priced at ₩1,627,300 found 1 day 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.

Hawaiian Airlines
Sun, Mar 1 - Tue, Mar 10
ICN
Seoul
ORD
Chicago
₩1,133,700 Roundtrip, found 14 hours ago
₩1,133,700
Roundtrip
found 14 hours ago
Select Hawaiian Airlines flight, departing Sun, Mar 1 from Seoul to Chicago, returning Tue, Mar 10, priced at ₩1,133,700 found 14 hours 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 ₩1,133,700. 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 ₩1,133,700 and ₩1,627,300. Many lucky travelers nabbed one-way tickets from Seoul (ICN) for as little as ₩635,600.
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 ₩1,133,700 to ₩1,627,300.
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.

Book with confidence

About Illinois

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About Illinois

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