$147+ Cheap flights from Illinois

This is the cheapest return flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ORD — SYD
14 Jan — 21 Jan1
1 adult
1 adult, Economy, 0 bags

What to know about flights from Illinois

Discover essential information about flights departing from Illinois, including flight schedules, destinations, airlines operating at the Illinois airport, and any specific guidelines or requirements for travellers. Please note that the information is based on the most recent updates available. Data last updated 15 December 2025.

Good round-trip deal

$261 or less

Good one-way deal

$102 or less
Price to beat on a round-trip flight from Illinois.
Search Deals
Price to beat on a one-way flight from Illinois.
Search Deals

Find flights from Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Illinois
Explore the most affordable flight options available from Illinois. Find the lowest fares based on data from user searches, with prices last updated on 15 December 2025.

Wed 11/215:10ORD - SYD
1 stop24h 50mQantas Airways
Wed 4/307:05SYD - ORD
2 stops26h 33mQantas Airways
Deal found 13/12$1,331
Sun 1/215:35ORD - SYD
1 stop25h 00mAir Canada
Sun 15/211:20SYD - ORD
1 stop20h 21mAir Canada
Deal found 14/12$1,354
Mon 2/218:40ORD - SYD
1 stop21h 20mQantas Airways
Mon 16/207:05SYD - ORD
2 stops31h 28mQantas Airways
Deal found 13/12$1,355
Tue 27/115:10ORD - SYD
1 stop23h 15mQantas Airways
Tue 3/219:15SYD - ORD
2 stops38h 34mQantas Airways
Deal found 13/12$1,375
Thu 5/207:04STL - MEL
1 stop33h 26mQantas Airways
Fri 20/206:45MEL - STL
2 stops34h 03mQantas Airways
Deal found 13/12$1,432
Sun 1/215:35ORD - SYD
1 stop25h 00mAir Canada
Wed 4/211:20SYD - ORD
2 stops22h 48mAir Canada
Deal found 13/12$1,433
Tue 5/509:00ORD - SYD
2 stops31h 20mAir Canada
Tue 26/509:20SYD - ORD
2 stops37h 45mAir Canada
Deal found 14/12$1,438
Wed 28/108:45ORD - BNE
2 stops32h 00mAir Canada
Sun 8/210:45BNE - ORD
1 stop19h 56mAir Canada
Deal found 14/12$1,438
Tue 27/114:15ORD - SYD
1 stop24h 10mQantas Airways
Wed 4/207:05SYD - ORD
2 stops26h 44mQantas Airways
Deal found 13/12$1,439
Tue 27/110:07STL - SYD
2 stops30h 28mMultiple Airlines
Tue 3/211:20SYD - STL
2 stops44h 55mMultiple Airlines
Deal found 12/12$1,450
Tue 27/107:04STL - SYD
1 stop31h 21mQantas Airways
Tue 3/207:05SYD - STL
2 stops33h 54mQantas Airways
Deal found 12/12$1,453
Tue 10/208:45ORD - BNE
2 stops32h 00mMultiple Airlines
Sun 22/206:05BNE - ORD
2 stops24h 36mMultiple Airlines
Deal found 13/12$1,471

Find flights from Illinois within your budget

 
Find flights departing from Illinois that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 15 December 2025. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Sydney

Route

Depart

Return

Price

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Wed 28/1

08:45-08:45

2 stops32h 00m

Brisbane

Sun 8/2

10:45-14:41

1 stop19h 56m

$1,438

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 10/2

08:45-08:45

2 stops32h 00m

Brisbane

Sun 22/2

06:05-14:41

2 stops24h 36m

$1,471

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Wed 18/2

15:35-08:45

1 stop25h 10m

Brisbane

Fri 27/2

10:45-16:38

1 stop21h 53m

$1,502

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Tue 27/1

15:35-16:20

2 stops32h 15m

Adelaide

Tue 3/2

06:00-22:05

3 stops32h 35m

$1,505

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 2/6

19:35-07:05

1 stop20h 30m

Brisbane

Tue 16/6

10:00-08:05

2 stops37h 05m

$1,538

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Thu 15/1

15:35-08:45

1 stop25h 10m

Brisbane

Sat 31/1

10:45-14:41

1 stop19h 56m

$1,566

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Fri 30/1

08:45-08:45

2 stops32h 00m

Brisbane

Fri 27/2

10:45-16:38

1 stop21h 53m

$1,566

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Wed 21/1

18:40-17:15

2 stops29h 35m

Melbourne

Thu 29/1

12:00-21:23

1 stop26h 23m

$1,644

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/2

07:04-09:50

2 stops33h 46m

Sydney Kingsford Smith

Fri 13/2

14:05-17:05

1 stop20h 00m

$1,657

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Thu 5/2

18:40-13:40

2 stops26h 30m

Adelaide

Wed 4/3

16:10-23:40

2 stops24h 00m

$1,686

Flights are sorted by cheapest return flights first.

Deals found on 12/12

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Illinois

Have a flexible travel schedule? Discover the best time to fly from Illinois with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Illinois

Get recent, data-driven insights about flights from Illinois including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Illinois?

Currently, August is the cheapest month in which you can book a flight from Illinois (average of $297). Flying from Illinois in December will prove the most costly (average of $1,279). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.

Which airlines fly from Illinois?

When flying from Illinois check dates and pricing for the following: Qantas Airways, American Airlines. As they depart for the following popular destinations: Sydney.

Qantas Airways
Qantas Airways
From $1,211
Spirit Airlines
Spirit Airlines
From $87
United Airlines
United Airlines
From $323
American Airlines
American Airlines
From $1,287

What is the cheapest place to fly to from Illinois?

The cheapest city to fly to from Illinois is Toronto, with prices starting at $102. Explore other affordable destinations below.

Toronto
Toronto
From $102
Los Angeles
Los Angeles
From $120
Memphis
Memphis
From $175
San Diego
San Diego
From $196

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Direct flights from USA

Book a direct flight from one of these other cities located in USA.
Direct flights from Moline

Related info for your journey

Access useful and relevant information related to your journey from Illinois. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 15 December 2025.

  • What is the cheapest month to fly from Illinois?

    Currently, the cheapest month for flights from Illinois is August. The most expensive month for flights is December. The cheapest prices are shown above but prices will vary according to departure times, airlines, class and how early you book.

  • Where are the cheapest places to fly to from Illinois?

    View the cheapest flight destinations from Illinois:
    Fly from Chicago to Sydney from $1,354 round trip
    Fly from Chicago to Melbourne from $1,417 round trip

  • How does Cheapflights help users find flights from Illinois?

    Deals for flights from Illinois are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose to your preference, such as price, airport, cabin class, and plenty of other options.

  • Why should you use Cheapflights to find cheap flight tickets from Illinois?

    Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Illinois for you. Better yet — we are completely free to use.

  • Can Cheapflights find flights from Illinois with no change fees?

    Users can book flights with no change fees policies with our dedicated filters. Book flights from Illinois flexibly with Cheapflights today.

  • Can Cheapflights notify me if prices for flights from Illinois become cheaper?

    Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and use a valid email address to enable the Price Alerts feature. That’s it!

See more FAQs

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Illinois?

Deals for flights from Illinois are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose to your preference, such as price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Illinois?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Illinois for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Illinois with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Illinois flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and use a valid email address to enable the Price Alerts feature. That’s it!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book With Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.