Cheap Flights to Illinois | Popular Routes to Illinois from HK$3,946

View HK$3,946 flight on Tue, 21 Apr 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

  • Alaska Airlines

    Alaska Airlines

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Cheap round-trip flights to Illinois

Prices were available within the past 7 days and start at HK$3,946 for one-way flights and HK$4,820 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, 11 Nov - Mon, 16 Nov
ICN
Seoul
ORD
Chicago
HK$4,820 Return, found 3 days ago
HK$4,820
Return
found 3 days ago
Select United flight, departing Wed, 11 Nov from Seoul to Chicago, returning Mon, 16 Nov, priced at HK$4,820 found 3 days ago
Asiana Airlines
Thu, 5 Feb - Fri, 20 Feb
ICN
Seoul
STL
St. Louis
HK$5,956 Return, found 23 hours ago
HK$5,956
Return
found 23 hours ago
Select Asiana Airlines flight, departing Thu, 5 Feb from Seoul to St. Louis, returning Fri, 20 Feb, priced at HK$5,956 found 23 hours ago
EVA Airways
Wed, 11 Nov - Mon, 16 Nov
ICN
Seoul
ORD
Chicago
HK$8,233 Return, found 3 days ago
HK$8,233
Return
found 3 days ago
Select EVA Airways flight, departing Wed, 11 Nov from Seoul to Chicago, returning Mon, 16 Nov, priced at HK$8,233 found 3 days ago
Air Canada
Thu, 5 Feb - Fri, 20 Feb
ICN
Seoul
STL
St. Louis
HK$8,837 Return, found 23 hours ago
HK$8,837
Return
found 23 hours ago
Select Air Canada flight, departing Thu, 5 Feb from Seoul to St. Louis, returning Fri, 20 Feb, priced at HK$8,837 found 23 hours ago
Asiana Airlines
Fri, 9 Oct - Thu, 15 Oct
ICN
Seoul
ORD
Chicago
HK$9,350 Return, found 2 days ago
HK$9,350
Return
found 2 days ago
Select Asiana Airlines flight, departing Fri, 9 Oct from Seoul to Chicago, returning Thu, 15 Oct, priced at HK$9,350 found 2 days ago
Delta
Fri, 9 Oct - Thu, 15 Oct
ICN
Seoul
ORD
Chicago
HK$9,354 Return, found 2 days ago
HK$9,354
Return
found 2 days ago
Select Delta flight, departing Fri, 9 Oct from Seoul to Chicago, returning Thu, 15 Oct, priced at HK$9,354 found 2 days ago
Korean Air
Wed, 11 Nov - Mon, 16 Nov
ICN
Seoul
ORD
Chicago
HK$9,536 Return, found 3 days ago
HK$9,536
Return
found 3 days ago
Select Korean Air flight, departing Wed, 11 Nov from Seoul to Chicago, returning Mon, 16 Nov, priced at HK$9,536 found 3 days ago
Delta
Fri, 9 Oct - Thu, 15 Oct
ICN
Seoul
MDW
Chicago
HK$10,008 Return, found 2 days ago
HK$10,008
Return
found 2 days ago
Select Delta flight, departing Fri, 9 Oct from Seoul to Chicago, returning Thu, 15 Oct, priced at HK$10,008 found 2 days ago
WestJet
Fri, 10 Jul - Thu, 20 Aug
ICN
Seoul
ORD
Chicago
HK$11,354 Return, found 4 days ago
HK$11,354
Return
found 4 days ago
Select WestJet flight, departing Fri, 10 Jul from Seoul to Chicago, returning Thu, 20 Aug, priced at HK$11,354 found 4 days ago
Turkish Airlines
Wed, 11 Nov - Mon, 16 Nov
ICN
Seoul
ORD
Chicago
HK$11,647 Return, found 3 days ago
HK$11,647
Return
found 3 days ago
Select Turkish Airlines flight, departing Wed, 11 Nov from Seoul to Chicago, returning Mon, 16 Nov, priced at HK$11,647 found 3 days ago

About Illinois

Expedia offers flights to Illinois to meet every traveller'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 HK$4,820. 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 HK$4,820 and HK$11,647. Many lucky travelers nabbed one-way tickets from Seoul (ICN) for as little as HK$3,946.
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 HK$4,820 to HK$11,647.
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.

China Airlines
Tue, 6 Oct - Tue, 13 Oct
HKG
Hong Kong SAR
ORD
Chicago
HK$6,579 Return, found 1 hour ago
HK$6,579
Return
found 1 hour ago
Select China Airlines flight, departing Tue, 6 Oct from Hong Kong SAR to Chicago, returning Tue, 13 Oct, priced at HK$6,579 found 1 hour ago
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