Cheap Flights to Illinois

View AU$957 flight on Tue, 10 Mar 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

  • JetBlue Airways

    JetBlue Airways

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Cheapest Flights to Illinois

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Air New Zealand
Mon, 9 Feb - Mon, 16 Feb
SYD
Sydney
ORD
Chicago
AU$1,566 Return, found 1 day ago
AU$1,566
Return
found 1 day ago
Select Air New Zealand flight, departing Mon, 9 Feb from Sydney to Chicago, returning Mon, 16 Feb, priced at AU$1,566 found 1 day ago
Air New Zealand
Mon, 9 Feb - Mon, 16 Feb
SYD
Sydney
STL
St. Louis
AU$1,662 Return, found 18 hours ago
AU$1,662
Return
found 18 hours ago
Select Air New Zealand flight, departing Mon, 9 Feb from Sydney to St. Louis, returning Mon, 16 Feb, priced at AU$1,662 found 18 hours ago
Air Canada
Wed, 4 Mar - Wed, 18 Mar
SYD
Sydney
ORD
Chicago
AU$1,670 Return, found 20 hours ago
AU$1,670
Return
found 20 hours ago
Select Air Canada flight, departing Wed, 4 Mar from Sydney to Chicago, returning Wed, 18 Mar, priced at AU$1,670 found 20 hours ago
American Airlines
Wed, 4 Mar - Wed, 18 Mar
SYD
Sydney
ORD
Chicago
AU$1,703 Return, found 20 hours ago
AU$1,703
Return
found 20 hours ago
Select American Airlines flight, departing Wed, 4 Mar from Sydney to Chicago, returning Wed, 18 Mar, priced at AU$1,703 found 20 hours ago
Qantas Airways
Mon, 23 Mar - Tue, 7 Apr
SYD
Sydney
ORD
Chicago
AU$1,722 Return, found 22 hours ago
AU$1,722
Return
found 22 hours ago
Select Qantas Airways flight, departing Mon, 23 Mar from Sydney to Chicago, returning Tue, 7 Apr, priced at AU$1,722 found 22 hours ago
United
Wed, 4 Mar - Wed, 25 Mar
SYD
Sydney
ORD
Chicago
AU$1,728 Return, found 2 hours ago
AU$1,728
Return
found 2 hours ago
Select United flight, departing Wed, 4 Mar from Sydney to Chicago, returning Wed, 25 Mar, priced at AU$1,728 found 2 hours ago
Delta
Tue, 30 Dec - Mon, 2 Mar
SYD
Sydney
MDW
Chicago
AU$1,729 Return, found 23 hours ago
AU$1,729
Return
found 23 hours ago
Select Delta flight, departing Tue, 30 Dec from Sydney to Chicago, returning Mon, 2 Mar, priced at AU$1,729 found 23 hours ago
Delta
Tue, 20 Jan - Tue, 3 Feb
SYD
Sydney
EVV
Evansville
AU$1,780 Return, found 3 days ago
AU$1,780
Return
found 3 days ago
Select Delta flight, departing Tue, 20 Jan from Sydney to Evansville, returning Tue, 3 Feb, priced at AU$1,780 found 3 days ago
Japan Airlines
Thu, 30 Apr - Mon, 11 May
PER
Perth
ORD
Chicago
AU$1,930 Return, found 19 hours ago
AU$1,930
Return
found 19 hours ago
Select Japan Airlines flight, departing Thu, 30 Apr from Perth to Chicago, returning Mon, 11 May, priced at AU$1,930 found 19 hours ago
Delta
Tue, 10 Feb - Tue, 17 Feb
SYD
Sydney
MLI
Moline
AU$1,979 Return, just found
AU$1,979
Return
just found
Select Delta flight, departing Tue, 10 Feb from Sydney to Moline, returning Tue, 17 Feb, priced at AU$1,979 just found

Illinois Flights

When was the last time you embarked on a grand adventure? Whether it was last month or years ago, there’s never been a better time to start planning your next big trip. Book tickets to Illinois today and get ready to build your travel itinerary, from exploring the area with your family to recharging in the change of scenery. During your stay, visit the must-see attractions, chow down on the local cuisine, and relish in a holiday state of mind. However you decide to spend your upcoming trip, we’re here to make your travel plans easy and affordable.

Book Your Illinois Airfare

At Expedia.com.au, it’s simple to find cheap flights to Illinois that won’t cause your wallet to flinch. Browse through our inventory of Illinois flights and find airfare matching your preferred times and dates. Looking for a red-eye flight or an afternoon departure? Don’t worry, we’ve got you covered. You can even take advantage of our convenient My Scratchpad online feature, which lets you track your search results with ease. No more excuses; book your travel arrangements with us today to make your dream trip a reality.

Illinois Flights Information

Airlines serving
Air New Zealand, Jetstar, American Airlines, Air Canada, United, Delta, Qantas Airways, Japan Airlines
Roundtrip price
from AU$1,566

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 AU$1,566. 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 AU$1,566 and AU$1,979. Many lucky travellers nabbed one-way tickets from Sydney (SYD) for as little as AU$957.
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 AU$1,566 to AU$1,979.
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 New Zealand
Mon, 9 Feb - Mon, 16 Feb
SYD
Sydney
ORD
Chicago
AU$1,566 Return, found 1 day ago
AU$1,566
Return
found 1 day ago
Select Air New Zealand flight, departing Mon, 9 Feb from Sydney to Chicago, returning Mon, 16 Feb, priced at AU$1,566 found 1 day ago
*Available to Expedia members.