Cheap Flights to Illinois | Popular Routes to Illinois from HK$931

View HK$931 flight on Wed, 22 Apr 2026Opens in a new window

Popular airlines to Illinois

  • Delta

  • Frontier Airlines

  • American Airlines

  • United

  • Southwest Airlines

  • Spirit 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$931 for one-way flights and HK$2,591 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,591 Return, found 23 hours ago
HK$2,591
Return
found 23 hours ago
Select United flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,591 found 23 hours ago
Alaska Airlines
Tue, 21 Apr - Wed, 29 Apr
SFO
San Francisco
STL
St. Louis
HK$2,647 Return, found 13 hours ago
HK$2,647
Return
found 13 hours ago
Select Alaska Airlines flight, departing Tue, 21 Apr from San Francisco to St. Louis, returning Wed, 29 Apr, priced at HK$2,647 found 13 hours ago
Delta
Wed, 13 May - Tue, 19 May
SFO
San Francisco
ORD
Chicago
HK$2,701 Return, found 6 days ago
HK$2,701
Return
found 6 days ago
Select Delta flight, departing Wed, 13 May from San Francisco to Chicago, returning Tue, 19 May, priced at HK$2,701 found 6 days ago
Delta
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,828 Return, found 23 hours ago
HK$2,828
Return
found 23 hours ago
Select Delta flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,828 found 23 hours ago
American Airlines
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,857 Return, found 23 hours ago
HK$2,857
Return
found 23 hours ago
Select American Airlines flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,857 found 23 hours ago
United
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,857 Return, found 23 hours ago
HK$2,857
Return
found 23 hours ago
Select United flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,857 found 23 hours ago
American Airlines
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,860 Return, found 23 hours ago
HK$2,860
Return
found 23 hours ago
Select American Airlines flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,860 found 23 hours ago
United
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,868 Return, found 23 hours ago
HK$2,868
Return
found 23 hours ago
Select United flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,868 found 23 hours ago
American Airlines
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,903 Return, found 23 hours ago
HK$2,903
Return
found 23 hours ago
Select American Airlines flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,903 found 23 hours ago
American Airlines
Mon, 18 May - Wed, 20 May
SFO
San Francisco
ORD
Chicago
HK$2,938 Return, found 23 hours ago
HK$2,938
Return
found 23 hours ago
Select American Airlines flight, departing Mon, 18 May from San Francisco to Chicago, returning Wed, 20 May, priced at HK$2,938 found 23 hours ago

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.

Delta
Tue, 16 Jun - Tue, 28 Jul
HKG
Hong Kong SAR
ORD
Chicago
HK$6,570 Return, found 4 days ago
HK$6,570
Return
found 4 days ago
Select Delta flight, departing Tue, 16 Jun from Hong Kong SAR to Chicago, returning Tue, 28 Jul, priced at HK$6,570 found 4 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 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$2,591. 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$2,591 and HK$6,570. Many lucky travelers nabbed one-way tickets from San Francisco (SFO) for as little as HK$931.
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$2,591 to HK$6,570.
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.

Book with confidence

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.
About Illinois

Explore a world of travel with Expedia

*Available to Expedia members.