Cheap Flights to Illinois | Popular Routes to Illinois from HK$531

View HK$531 flight on Fri, 20 Mar 2026Opens in a new window

Popular airlines to Illinois

  • Delta

    Delta

  • American Airlines

    American Airlines

  • United

    United

  • Frontier Airlines

    Frontier Airlines

  • Southwest Airlines

    Southwest Airlines

  • Spirit Airlines

    Spirit Airlines

  • Alaska Airlines

    Alaska Airlines

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 35% on select hotels after you book a flight*
  • trophy illustration

    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$531 for one-way flights and HK$1,070 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 27 Jan - Sat, 31 Jan
BOS
Boston
ORD
Chicago
HK$1,070 Return, found 4 days ago
HK$1,070
Return
found 4 days ago
Select Delta flight, departing Tue, 27 Jan from Boston to Chicago, returning Sat, 31 Jan, priced at HK$1,070 found 4 days ago
Delta
Thu, 26 Feb - Sat, 28 Feb
BOS
Boston
ORD
Chicago
HK$1,083 Return, found 1 day ago
HK$1,083
Return
found 1 day ago
Select Delta flight, departing Thu, 26 Feb from Boston to Chicago, returning Sat, 28 Feb, priced at HK$1,083 found 1 day ago
Delta
Tue, 20 Jan - Mon, 2 Feb
BOS
Boston
ORD
Chicago
HK$1,113 Return, found 5 days ago
HK$1,113
Return
found 5 days ago
Select Delta flight, departing Tue, 20 Jan from Boston to Chicago, returning Mon, 2 Feb, priced at HK$1,113 found 5 days ago
Delta
Wed, 4 Feb - Tue, 17 Feb
BOS
Boston
ORD
Chicago
HK$1,231 Return, found 2 days ago
HK$1,231
Return
found 2 days ago
Select Delta flight, departing Wed, 4 Feb from Boston to Chicago, returning Tue, 17 Feb, priced at HK$1,231 found 2 days ago
Delta
Mon, 2 Feb - Thu, 19 Feb
BOS
Boston
ORD
Chicago
HK$1,242 Return, found 5 days ago
HK$1,242
Return
found 5 days ago
Select Delta flight, departing Mon, 2 Feb from Boston to Chicago, returning Thu, 19 Feb, priced at HK$1,242 found 5 days ago
Delta
Thu, 26 Feb - Sat, 28 Feb
BOS
Boston
ORD
Chicago
HK$1,244 Return, found 1 day ago
HK$1,244
Return
found 1 day ago
Select Delta flight, departing Thu, 26 Feb from Boston to Chicago, returning Sat, 28 Feb, priced at HK$1,244 found 1 day ago
Delta
Wed, 25 Feb - Sun, 1 Mar
BOS
Boston
ORD
Chicago
HK$1,276 Return, found 1 day ago
HK$1,276
Return
found 1 day ago
Select Delta flight, departing Wed, 25 Feb from Boston to Chicago, returning Sun, 1 Mar, priced at HK$1,276 found 1 day ago
United
Sat, 7 Feb - Mon, 9 Feb
BOS
Boston
ORD
Chicago
HK$1,425 Return, found 2 days ago
HK$1,425
Return
found 2 days ago
Select United flight, departing Sat, 7 Feb from Boston to Chicago, returning Mon, 9 Feb, priced at HK$1,425 found 2 days ago
American Airlines
Sat, 7 Feb - Mon, 9 Feb
BOS
Boston
ORD
Chicago
HK$1,501 Return, found 2 days ago
HK$1,501
Return
found 2 days ago
Select American Airlines flight, departing Sat, 7 Feb from Boston to Chicago, returning Mon, 9 Feb, priced at HK$1,501 found 2 days ago
Alaska Airlines
Sun, 18 Jan - Sun, 25 Jan
SEA
Seattle
ORD
Chicago
HK$2,930 Return, found 4 days ago
HK$2,930
Return
found 4 days ago
Select Alaska Airlines flight, departing Sun, 18 Jan from Seattle to Chicago, returning Sun, 25 Jan, priced at HK$2,930 found 4 days 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.

China Airlines
Thu, 16 Apr - Thu, 23 Apr
HKG
Hong Kong SAR
ORD
Chicago
HK$6,579 Return, found 1 day ago
HK$6,579
Return
found 1 day ago
Select China Airlines flight, departing Thu, 16 Apr from Hong Kong SAR to Chicago, returning Thu, 23 Apr, priced at HK$6,579 found 1 day 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$1,070. 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$1,070 and HK$6,579. Many lucky travelers nabbed one-way tickets from Boston (BOS) for as little as HK$531.
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$1,070 to HK$6,579.
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.