Cheap Flights to Illinois | Popular Routes to Illinois from HK$3,748

View HK$3,748 flight on Tue, 16 Jun 2026Opens in a new window

Popular airlines to Illinois

  • Delta

  • Spirit Airlines

  • American Airlines

  • United

  • Southwest Airlines

  • Frontier Airlines

  • Alaska Airlines

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 35% 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 HK$3,748 for one-way flights and HK$5,614 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Jeju Air
Fri, 13 Mar - Wed, 18 Mar
ICN
Seoul
ORD
Chicago
HK$5,614 Return, found 6 days ago
HK$5,614
Return
found 6 days ago
Select Jeju Air flight, departing Fri, 13 Mar from Seoul to Chicago, returning Wed, 18 Mar, priced at HK$5,614 found 6 days ago
Air Canada
Mon, 22 Jun - Tue, 4 Aug
HKG
Hong Kong SAR
ORD
Chicago
HK$6,000 Return, found 7 hours ago
HK$6,000
Return
found 7 hours ago
Select Air Canada flight, departing Mon, 22 Jun from Hong Kong SAR to Chicago, returning Tue, 4 Aug, priced at HK$6,000 found 7 hours ago
China Airlines
Mon, 5 Oct - Tue, 6 Oct
HKG
Hong Kong SAR
STL
St. Louis
HK$6,680 Return, found 1 day ago
HK$6,680
Return
found 1 day ago
Select China Airlines flight, departing Mon, 5 Oct from Hong Kong SAR to St. Louis, returning Tue, 6 Oct, priced at HK$6,680 found 1 day ago
EVA Airways
Fri, 13 Feb - Sun, 22 Feb
HKG
Hong Kong SAR
ORD
Chicago
HK$6,730 Return, just found
HK$6,730
Return
just found
Select EVA Airways flight, departing Fri, 13 Feb from Hong Kong SAR to Chicago, returning Sun, 22 Feb, priced at HK$6,730 just found
United
Mon, 4 May - Mon, 4 May
HKG
Hong Kong SAR
ORD
Chicago
HK$6,732 Return, found 14 hours ago
HK$6,732
Return
found 14 hours ago
Select United flight, departing Mon, 4 May from Hong Kong SAR to Chicago, returning Mon, 4 May, priced at HK$6,732 found 14 hours ago
Delta
Wed, 2 Sept - Sat, 12 Sept
HKG
Hong Kong SAR
ORD
Chicago
HK$6,876 Return, found 3 hours ago
HK$6,876
Return
found 3 hours ago
Select Delta flight, departing Wed, 2 Sept from Hong Kong SAR to Chicago, returning Sat, 12 Sept, priced at HK$6,876 found 3 hours ago
Korean Air
Thu, 15 Oct - Tue, 20 Oct
HKG
Hong Kong SAR
ORD
Chicago
HK$6,884 Return, found 22 hours ago
HK$6,884
Return
found 22 hours ago
Select Korean Air flight, departing Thu, 15 Oct from Hong Kong SAR to Chicago, returning Tue, 20 Oct, priced at HK$6,884 found 22 hours ago
Delta
Tue, 3 Mar - Mon, 9 Mar
HKG
Hong Kong SAR
MDW
Chicago
HK$6,914 Return, found 4 days ago
HK$6,914
Return
found 4 days ago
Select Delta flight, departing Tue, 3 Mar from Hong Kong SAR to Chicago, returning Mon, 9 Mar, priced at HK$6,914 found 4 days ago
American Airlines
Thu, 12 Feb - Sat, 21 Feb
ICN
Seoul
STL
St. Louis
HK$7,201 Return, found 12 hours ago
HK$7,201
Return
found 12 hours ago
Select American Airlines flight, departing Thu, 12 Feb from Seoul to St. Louis, returning Sat, 21 Feb, priced at HK$7,201 found 12 hours ago
Cathay Pacific
Wed, 2 Sept - Sat, 12 Sept
HKG
Hong Kong SAR
ORD
Chicago
HK$7,222 Return, found 3 hours ago
HK$7,222
Return
found 3 hours ago
Select Cathay Pacific flight, departing Wed, 2 Sept from Hong Kong SAR to Chicago, returning Sat, 12 Sept, priced at HK$7,222 found 3 hours 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$5,614. 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$5,614 and HK$7,222. Many lucky travelers nabbed one-way tickets from Hong Kong SAR (HKG) for as little as HK$3,748.
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$5,614 to HK$7,222.
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.

Air Canada
Mon, 22 Jun - Tue, 4 Aug
HKG
Hong Kong SAR
ORD
Chicago
HK$6,000 Return, found 7 hours ago
HK$6,000
Return
found 7 hours ago
Select Air Canada flight, departing Mon, 22 Jun from Hong Kong SAR to Chicago, returning Tue, 4 Aug, priced at HK$6,000 found 7 hours ago
*Available to Expedia members.