$233+ 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 17/6. 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 — MEL
11 Jun — 18 Jun1
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 12 May 2026. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/8

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Fri 14/8

10:20-18:39

1 stop23h 19m

$1,741

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 13/6

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sat 27/6

09:30-18:13

2 stops23h 43m

$1,748

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

14:30-06:50

2 stops25h 20m

Sydney Kingsford Smith

Wed 29/7

09:15-23:22

2 stops29h 07m

$1,847

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Wed 16/9

08:45-07:05

2 stops31h 20m

Brisbane

Thu 24/9

10:15-05:57

2 stops34h 42m

$1,930

ChicagoMelbourne

ORD - AVV

ORDAVV

Chicago O'Hare Intl

Thu 22/10

15:40-14:10

2 stops30h 30m

Melbourne Avalon

Wed 11/11

06:00-14:41

2 stops25h 41m

$1,981

ChicagoMelbourne

ORD - AVV

ORDAVV

Chicago O'Hare Intl

Sat 17/10

15:40-16:05

2 stops32h 25m

Melbourne Avalon

Sat 31/10

06:00-14:41

2 stops24h 41m

$1,986

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

15:35-06:55

1 stop24h 20m

Sydney Kingsford Smith

Mon 14/9

12:00-18:14

1 stop21h 14m

$2,013

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 1/9

18:54-18:50

2 stops32h 56m

Sydney Kingsford Smith

Tue 8/9

20:45-06:22

3 stops24h 37m

$2,112

ChicagoBrisbane

ORD - BNE

ORDBNE

Chicago O'Hare Intl

Sun 21/6

15:40-07:05

1 stop24h 25m

Brisbane

Fri 26/6

10:00-11:20

2 stops40h 20m

$2,129

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 25/8

20:42-18:50

2 stops31h 08m

Sydney Kingsford Smith

Fri 4/9

20:45-06:22

3 stops24h 37m

$2,192

Flights are sorted by cheapest return flights first.

Deals found on 11/5

Showing 1-10 of 60 resultsSorted by cheapest first
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.

When is the best time to book a flight from Illinois?

The best time to book flights from Illinois is 42 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, November is the cheapest month in which you can book a flight from Illinois (average of $156). Flying from Illinois in February will prove the most costly (average of $1,258). 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: Melbourne.

Qantas Airways
Qantas Airways
From $1,721
Spirit Airlines
Spirit Airlines
From $80
United Airlines
United Airlines
From $297

What is the cheapest place to fly to from Illinois?

The cheapest city to fly to from Illinois is Toronto, with prices starting at $94. Explore other affordable destinations below.

Toronto
Toronto
From $94
New York
New York
From $122
Memphis
Memphis
From $161
Calgary
Calgary
From $240

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 12 May 2026.

  • 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 $1,429. While Chicago Midway airport is usually cheaper if your destination is Sydney with prices starting at $1,868. 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 November. The most expensive month for flights is February. 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 $1,429 round trip
    Fly from Chicago to Melbourne from $1,697 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.