$187+ 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 1/5. 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
5 May — 12 May1
1 adult
1 adult, Economy, 0 bags

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 5 April 2026. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 4/5

14:15-11:20

3 stops30h 05m

Melbourne

Wed 20/5

20:50-20:09

3 stops38h 19m

$1,717

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 1/9

08:55-11:35

2 stops35h 40m

Melbourne

Tue 15/9

06:00-20:00

2 stops29h 00m

$2,066

ChicagoAdelaide

ORD - ADL

ORDADL

Chicago O'Hare Intl

Thu 14/5

19:21-11:55

2 stops26h 04m

Adelaide

Sat 23/5

06:00-15:52

2 stops24h 22m

$2,075

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 4/5

15:38-05:00

1 stop22h 22m

Melbourne

Wed 20/5

09:45-23:59

1 stop29h 14m

$2,117

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 15/5

19:06-08:15

1 stop22h 09m

Melbourne

Fri 22/5

10:55-18:17

1 stop22h 22m

$2,141

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 7/5

19:06-08:15

1 stop22h 09m

Melbourne

Sat 23/5

10:55-18:17

1 stop22h 22m

$2,143

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 4/5

15:20-08:15

2 stops25h 55m

Melbourne

Wed 20/5

10:55-18:22

1 stop22h 27m

$2,143

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sun 3/5

19:06-08:15

1 stop22h 09m

Melbourne

Fri 22/5

10:55-20:43

2 stops24h 48m

$2,148

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 4/5

19:06-08:15

1 stop22h 09m

Melbourne

Fri 22/5

09:30-17:23

2 stops22h 53m

$2,148

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

19:06-06:55

1 stop20h 49m

Sydney Kingsford Smith

Mon 18/5

10:20-18:22

1 stop23h 02m

$2,151

Flights are sorted by cheapest return flights first.

Deals found on 31/3

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $287). Flying from Illinois in July will prove the most costly (average of $1,799). 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. As it departs for the following popular destinations: Sydney.

Qantas Airways
Qantas Airways
From $1,182
Spirit Airlines
Spirit Airlines
From $84
United Airlines
United Airlines
From $311

What is the cheapest place to fly to from Illinois?

The cheapest city to fly to from Illinois is Toronto, with prices starting at $99. Explore other affordable destinations below.

Toronto
Toronto
From $99
Memphis
Memphis
From $169
Calgary
Calgary
From $252
Bogotá El Dorado
Bogotá El Dorado
From $271

Browse thousands of different options on Cheapflights for your next trip

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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 5 April 2026.

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

    The cheapest routes to Sydney can be found at Chicago O'Hare Intl airport from $1,330. While Chicago Midway airport is usually cheaper if your destination is Sydney with prices starting at $1,870. 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 July. 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 $1,330 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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