$135+ 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 27/1. 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
3 Jan — 10 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 4 December 2025.

Good round-trip deal

$264 or less

Good one-way deal

$103 or less
Price to beat on a round-trip flight from Illinois.
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Price to beat on a one-way flight from Illinois.
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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 4 December 2025.

Tue 17/216:30ORD - MEL
1 stop24h 00mQantas Airways
Tue 3/306:45MEL - ORD
2 stops26h 53mQantas Airways
Deal found 2/12$1,431
Wed 21/118:40ORD - SYD
1 stop21h 20mQantas Airways
Wed 4/207:05SYD - ORD
2 stops24h 52mQantas Airways
Deal found 2/12$1,443
Tue 10/215:35ORD - SYD
1 stop25h 00mAir Canada
Tue 3/311:20SYD - ORD
1 stop20h 21mAir Canada
Deal found 2/12$1,445
Wed 28/108:45ORD - BNE
2 stops32h 00mAir Canada
Sun 8/210:45BNE - ORD
1 stop19h 56mAir Canada
Deal found 3/12$1,445
Sat 17/119:12ORD - SYD
1 stop41h 58mQantas Airways
Sat 24/116:20SYD - ORD
2 stops41h 29mQantas Airways
Deal found 3/12$1,448
Sun 1/208:45ORD - SYD
2 stops31h 50mAir Canada
Sun 22/211:20SYD - ORD
2 stops25h 50mAir Canada
Deal found 3/12$1,450
Sun 1/208:45ORD - SYD
2 stops31h 50mAir Canada
Sun 15/211:20SYD - ORD
2 stops25h 50mAir Canada
Deal found 2/12$1,451
Tue 10/208:45ORD - BNE
2 stops32h 00mAir Canada
Sun 22/210:45BNE - ORD
2 stops37h 15mAir Canada
Deal found 2/12$1,451
Tue 3/208:45ORD - SYD
2 stops31h 50mAir Canada
Wed 18/310:20SYD - ORD
1 stop25h 35mAir Canada
Deal found 3/12$1,453
Sun 1/315:35ORD - SYD
1 stop25h 00mAir Canada
Tue 31/310:20SYD - ORD
2 stops25h 30mAir Canada
Deal found 3/12$1,457
Tue 10/210:35ORD - SYD
3 stops30h 00mAir Canada
Tue 14/409:20SYD - ORD
1 stop20h 23mAir Canada
Deal found 3/12$1,460
Thu 12/214:00ORD - MEL
1 stop26h 30mQantas Airways
Mon 23/218:30MEL - ORD
2 stops39h 08mQantas Airways
Deal found 2/12$1,465

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 4 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

15:35-08:45

1 stop25h 10m

Brisbane

Sun 8/2

10:45-17:08

2 stops46h 23m

$1,447

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Tue 10/2

08:45-08:45

2 stops32h 00m

Brisbane

Sun 22/2

10:45-14:41

1 stop19h 56m

$1,447

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/2

07:04-09:00

1 stop32h 56m

Sydney Kingsford Smith

Wed 18/2

07:05-23:48

2 stops33h 43m

$1,492

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 6/2

14:45-09:35

2 stops25h 50m

Sydney Kingsford Smith

Tue 10/2

11:20-15:29

2 stops45h 09m

$1,682

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 6/2

17:04-21:55

2 stops35h 51m

Sydney Kingsford Smith

Tue 10/2

14:05-16:14

1 stop19h 09m

$1,708

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Sat 21/2

11:45-05:00

1 stop24h 15m

Melbourne

Sat 28/2

16:05-21:33

1 stop22h 28m

$1,717

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Wed 25/3

13:15-05:00

1 stop23h 45m

Melbourne

Mon 6/4

13:35-21:26

1 stop22h 51m

$1,717

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Mon 13/4

17:30-06:45

1 stop22h 15m

Melbourne

Tue 28/4

09:45-15:56

1 stop21h 11m

$1,717

ChicagoMelbourne

ORD - MEL

ORDMEL

Chicago O'Hare Intl

Wed 25/2

13:15-05:00

1 stop22h 45m

Melbourne

Fri 6/3

16:05-21:19

1 stop22h 14m

$1,718

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Thu 2/4

13:40-05:00

1 stop24h 20m

Brisbane

Sun 12/4

20:35-05:13

1 stop23h 38m

$1,721

Flights are sorted by cheapest return flights first.

Deals found on 1/12

Showing 1-10 of 60 results
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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 $301). Flying from Illinois in January will prove the most costly (average of $1,292). 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 $1,223
Spirit Airlines
Spirit Airlines
From $88
United Airlines
United Airlines
From $326
American Airlines
American Airlines
From $1,300

What is the cheapest place to fly to from Illinois?

The cheapest city to fly to from Illinois is Dallas/Fort Worth, with prices starting at $89. Explore other affordable destinations below.

Dallas/Fort Worth
Dallas/Fort Worth
From $89
Toronto
Toronto
From $103
Memphis
Memphis
From $177
San Diego
San Diego
From $198

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Direct flights from USA

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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 4 December 2025.

  • Which is the cheapest airport to catch a flight from Illinois?

    The cheapest routes to Melbourne can be found at Chicago O'Hare Intl airport from $1,228. While Chicago Midway airport is usually cheaper if your destination is Sydney with prices starting at $1,369. Reference our flight search to find the best deals in real time.

  • 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 January. 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 Melbourne from $1,228 round trip
    Fly from Chicago to Sydney from $1,311 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!

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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!

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