$152+ 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 8/12. 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
18 Dec — 25 Dec1
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 18 November 2025.

Good round-trip deal

$543 or less

Good one-way deal

$104 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 18 November 2025.

Mon 1/1218:23ORD - SYD
1 stop21h 37mQantas Airways
Sat 6/1207:05SYD - ORD
2 stops26h 49mQantas Airways
Deal found 16/11$1,382
Sun 25/118:40ORD - SYD
1 stop21h 20mQantas Airways
Tue 3/207:05SYD - ORD
2 stops26h 44mQantas Airways
Deal found 16/11$1,394
Wed 25/219:39ORD - MEL
2 stops28h 36mQantas Airways
Fri 6/312:00MEL - ORD
1 stop28h 41mQantas Airways
Deal found 17/11$1,448
Wed 11/218:40ORD - SYD
1 stop21h 20mQantas Airways
Wed 25/207:05SYD - ORD
2 stops26h 34mQantas Airways
Deal found 17/11$1,460
Thu 4/1208:50ORD - MEL
2 stops39h 25mQantas Airways
Wed 14/112:00MEL - ORD
1 stop28h 59mQantas Airways
Deal found 15/11$1,463
Mon 1/1207:00STL - SYD
1 stop33h 00mQantas Airways
Sat 6/1207:05SYD - STL
2 stops33h 52mQantas Airways
Deal found 15/11$1,474
Tue 10/218:40ORD - BNE
2 stops44h 50mQantas Airways
Sun 22/219:40BNE - ORD
1 stop20h 01mQantas Airways
Deal found 17/11$1,486
Tue 10/218:40ORD - SYD
2 stops33h 10mQantas Airways
Sat 28/211:20SYD - ORD
1 stop23h 21mQantas Airways
Deal found 17/11$1,494
Sun 1/318:50STL - SYD
2 stops33h 00mQantas Airways
Wed 18/311:20SYD - STL
1 stop27h 49mQantas Airways
Deal found 17/11$1,494
Mon 8/1217:30STL - SYD
2 stops34h 20mQantas Airways
Wed 17/1217:45SYD - STL
1 stop23h 12mQantas Airways
Deal found 16/11$1,505
Sat 17/117:30ORD - SYD
1 stop22h 30mQantas Airways
Sat 24/107:05SYD - ORD
2 stops24h 52mQantas Airways
Deal found 16/11$1,506
Thu 29/107:04STL - SYD
1 stop32h 56mQantas Airways
Thu 5/214:35SYD - STL
2 stops42h 39mQantas Airways
Deal found 17/11$1,508

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 18 November 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

Thu 29/1

15:10-07:30

2 stops48h 20m

Brisbane

Thu 12/2

19:40-23:41

1 stop20h 01m

$1,486

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Sat 6/12

06:00-07:25

2 stops32h 25m

Sydney Kingsford Smith

Sun 21/12

11:20-23:21

2 stops29h 01m

$1,715

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 12/12

17:30-06:55

1 stop20h 25m

Sydney Kingsford Smith

Wed 31/12

17:30-23:51

2 stops23h 21m

$1,890

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 2/2

11:55-05:00

1 stop24h 05m

Melbourne

Sat 14/2

16:05-19:19

1 stop20h 14m

$1,936

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Mon 1/12

05:30-09:00

2 stops34h 30m

Sydney Kingsford Smith

Sat 6/12

11:20-11:08

2 stops40h 48m

$1,954

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 10/4

16:09-06:55

1 stop23h 46m

Sydney Kingsford Smith

Fri 24/4

12:00-16:11

1 stop19h 11m

$1,959

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/2

11:55-06:55

1 stop26h 00m

Sydney Kingsford Smith

Thu 26/2

14:05-17:05

1 stop20h 00m

$1,959

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 10/4

18:00-06:55

1 stop21h 55m

Sydney Kingsford Smith

Fri 24/4

12:00-16:11

1 stop19h 11m

$1,959

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 4/3

17:25-10:00

1 stop23h 35m

Melbourne

Wed 18/3

12:00-22:25

1 stop26h 25m

$1,962

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 5/3

13:14-10:00

2 stops27h 46m

Melbourne

Mon 16/3

10:30-16:49

2 stops22h 19m

$1,962

Flights are sorted by cheapest return flights first.

Deals found on 17/11

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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 $304). Flying from Illinois in January will prove the most costly (average of $1,305). 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 $1,237
Spirit Airlines
Spirit Airlines
From $89
United Airlines
United Airlines
From $330
American Airlines
American Airlines
From $1,315

What is the cheapest place to fly to from Illinois?

The cheapest city to fly to from Illinois is Raleigh-Durham, with prices starting at $100. Explore other affordable destinations below.

Raleigh-Durham
Raleigh-Durham
From $100
Toronto
Toronto
From $104
Los Angeles
Los Angeles
From $120
Memphis
Memphis
From $179

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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 18 November 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 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 Sydney from $1,288 round trip
    Fly from Chicago to Melbourne from $1,419 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!

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