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Cheap flights from Australia to Illinois from $675

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/3. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
28 Feb — 7 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Australia to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Australia to Illinois
Explore the most affordable flight options available from Australia to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 January 2026.

Thu 5/219:40
BNE
-
STL
2 stops20h 19m
American Airlines
Mon 9/208:31
STL
-
BNE
2 stops28h 29m
American Airlines
Deal found 26/1$1,098
Sun 8/319:40
BNE
-
STL
1 stop19h 18m
American Airlines
Mon 16/311:41
STL
-
BNE
2 stops26h 49m
American Airlines
Deal found 26/1$1,099
Sun 8/310:40
BNE
-
STL
2 stops27h 45m
Delta
Mon 16/313:39
STL
-
BNE
2 stops26h 41m
Delta
Deal found 26/1$1,112
Fri 13/310:10
BNE
-
STL
2 stops24h 19m
Multiple Airlines
Fri 20/318:50
STL
-
BNE
1 stop19h 40m
Multiple Airlines
Deal found 26/1$1,137
Mon 16/209:40
BNE
-
STL
1 stop25h 49m
Qantas Airways
Fri 6/306:38
STL
-
BNE
1 stop30h 22m
Qantas Airways
Deal found 27/1$1,234
Mon 16/211:40
BNE
-
STL
2 stops26h 37m
United Airlines
Fri 6/305:00
STL
-
BNE
2 stops34h 30m
United Airlines
Deal found 27/1$1,262
Fri 13/309:10
MEL
-
STL
2 stops24h 43m
Delta
Fri 20/307:03
STL
-
MEL
2 stops31h 57m
Delta
Deal found 27/1$1,262
Wed 25/210:10
MEL
-
STL
2 stops31h 15m
Delta
Wed 4/314:22
STL
-
MEL
2 stops24h 38m
Delta
Deal found 27/1$1,266
Wed 6/510:00
BNE
-
ORD
1 stop19h 45m
Air Canada
Tue 2/608:45
ORD
-
BNE
2 stops31h 20m
Air Canada
Deal found 27/1$1,275
Tue 17/319:40
BNE
-
ORD
2 stops37h 24m
American Airlines
Wed 1/416:44
ORD
-
BNE
1 stop21h 16m
American Airlines
Deal found 27/1$1,292
Wed 18/209:40
BNE
-
ORD
2 stops37h 01m
American Airlines
Sat 21/221:21
ORD
-
BNE
1 stop39h 39m
American Airlines
Deal found 27/1$1,298
Thu 12/312:00
MEL
-
STL
2 stops24h 41m
United Airlines
Thu 19/306:51
STL
-
MEL
1 stop34h 09m
United Airlines
Deal found 27/1$1,301

Find flight deals from Australia to Illinois

Keep the following information in mind while searching for Australia to Illinois flight deals. Data was last updated 29 January 2026.

Round-trip from

$1,098

One-way from

$675

Popular in

December

Cheapest in

March

Average price

$1,438
American Airlines
  • American Airlines
  • 8/3-16/3
  • 2 total stops
  • 50h 40m total
  • Australia to Illinois
Search Deals
14/3
  • 14/3
  • 2 total stops
  • 31h 04m total
  • Australia to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($396 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($69 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Australia to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 29 January 2026.
Use the filters below to find and compare flights from Australia to Illinois that are best for you.

Fly from

Australia

Fly to

Illinois

Route

Depart

Return

Price

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Sun 8/3

19:40-23:58

1 stop19h 18m

Lambert-St Louis

Mon 16/3

06:38-05:00

1 stop31h 22m

$1,098

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Mon 16/2

19:40-23:59

1 stop20h 19m

Lambert-St Louis

Fri 6/3

06:38-05:00

1 stop30h 22m

$1,098

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Fri 13/3

08:40-17:13

1 stop23h 33m

Lambert-St Louis

Fri 20/3

18:50-05:30

1 stop19h 40m

$1,101

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Sun 8/3

10:40-22:25

2 stops27h 45m

Lambert-St Louis

Mon 16/3

13:39-07:20

2 stops26h 41m

$1,112

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Fri 13/3

10:10-19:29

2 stops24h 19m

Lambert-St Louis

Fri 20/3

18:50-05:30

1 stop19h 40m

$1,137

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Mon 16/2

09:40-19:29

1 stop25h 49m

Lambert-St Louis

Fri 6/3

06:38-05:00

1 stop30h 22m

$1,234

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Mon 16/2

11:40-22:17

2 stops26h 37m

Lambert-St Louis

Fri 6/3

05:00-07:30

2 stops34h 30m

$1,262

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Fri 13/3

09:10-17:53

2 stops24h 43m

Lambert-St Louis

Fri 20/3

07:03-07:00

2 stops31h 57m

$1,262

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Wed 25/2

10:10-00:25

2 stops31h 15m

Lambert-St Louis

Wed 4/3

14:22-08:00

2 stops24h 38m

$1,266

BrisbaneChicago

BNE - ORD

BNEORD

Brisbane

Wed 6/5

10:00-17:01

2 stops46h 01m

Chicago O'Hare Intl

Tue 2/6

08:45-07:05

2 stops31h 20m

$1,275

Flights are sorted by cheapest return flights first.

Deals found on 27/1

Showing 1-10 of 60 results
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Best time to book a flight from Australia to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Australia 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.

Cheapflights Insights

Everything you need to know about your flight from Australia to Illinois

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

Currently, May is the cheapest month in which you can book a flight from Australia to Illinois (average of $867). Flying from Australia to Illinois in December is currently the most expensive (average of $1,476). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 29 January 2026.
Read reviews from past customers who have flown with Air New Zealand, Qantas Airways, andUnited Airlines from Australia to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Entertainment

7.4

Food

7.4

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
Air New Zealand
8.0
Very Good
577 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Entertainment

7.4

Food

7.4

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
Qantas Airways
7.5
Good
981 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Entertainment

7.4

Food

7.4

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
United Airlines
7.4
Good
9,214 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Entertainment

7.4

Food

7.4

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
American Airlines
7.2
Good
11,205 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Entertainment

7.4

Food

7.4

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
Air Canada
7.1
Good
10,667 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.5

Overall

8.0

Entertainment

7.4

Food

7.4

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane

Related info for your journey

Find useful and relevant information for your journey from Australia to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Australia to Illinois?

    Airlines like American Airlines, Qantas Airways, and Delta fly from Australia to Illinois in about 19h 18m. The time it takes to get you to your destination can typically vary by up to 8h 27m. There are 14074 km between Australia and Illinois. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Australia to Illinois one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $181. Qantas Airways flights start at $538 while deals on Air New Zealand start at $756 one-way.

  • Can I find deals for flights from Australia to Illinois that include hotel bookings?

    Yes. In addition to deals on Australia to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Australia to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Australia to Illinois.

  • Can I find deals for business class flights from Australia to Illinois?

    Yes. Cheapflights offers flight deals from Australia to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, May is the cheapest month in which you can book a flight from Australia to Illinois (average of $867). Flying from Australia to Illinois in December is currently the most expensive (average of $1,476). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Australia to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Australia to Illinois

Discover the top 9 airlines that operate flights from Australia to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 29 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$905Average$1,479FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,082Average$1,617FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air New ZealandCheapest$1,096Average$1,556FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
American AirlinesCheapest$1,103Average$1,510FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$1,261Average$2,010FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Cathay PacificCheapest$1,389Average$1,928FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
ANACheapest$1,500Average$1,619FlexibilityNo cancel feeOn-time80%
Search ANA flights
Japan AirlinesCheapest$1,846Average$2,268FlexibilityNo cancel feeOn-time79%
Search Japan Airlines flights
Qatar AirwaysCheapest$2,330Average$3,002FlexibilityNo cancel feeOn-time68%
Search Qatar Airways flights

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 Australia to Illinois?

Cheapflights helps you search for flights from Australia to Illinois via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Illinois from Australia.

Can Cheapflights find flights from Australia to Illinois with no change fees?

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

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

Yes, Cheapflights offers price alerts on Australia to Illinois flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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