$617+ Cheap flights from Australia to Illinois
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 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
Jun 4 — Jun 111
Round-trip
1 adult, Economy
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Cheapest flights from Australia to IllinoisExplore 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 May 5, 2026.
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 May 5, 2026.
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:20 am
SYD
- STL
2 stops41h 46m
Multiple Airlines
Thu 5/284:48 pm
STL
- SYD
2 stops23h 32m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$1,163
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:20 am
SYD
- STL
2 stops26h 05m
Air Canada
Thu 5/281:05 pm
STL
- SYD
3 stops51h 15m
Air Canada
Deal found 4/30![Air Canada logo]()
$1,207
This United Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1310:20 am
SYD
- STL
2 stops21h 37m
United Airlines
Sat 6/67:05 pm
STL
- SYD
2 stops44h 50m
United Airlines
Deal found 5/4![United Airlines logo]()
$1,223
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/210:20 am
SYD
- STL
1 stop22h 57m
United Airlines
Tue 6/94:48 pm
STL
- SYD
2 stops23h 07m
United Airlines
Deal found 5/3![United Airlines logo]()
$1,227
This American Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:10 am
SYD
- STL
1 stop29h 49m
American Airlines
Thu 5/289:41 am
STL
- SYD
2 stops30h 24m
American Airlines
Deal found 4/30![American Airlines logo]()
$1,228
This Aunt Betty deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Aunt Betty is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1312:00 pm
SYD
- STL
1 stop22h 30m
Qantas Airways
Sat 6/67:21 pm
STL
- SYD
1 stop20h 34m
Qantas Airways
Deal found 5/4![Qantas Airways logo]()
$1,232
This American Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/312:00 pm
SYD
- STL
1 stop19h 28m
American Airlines
Thu 8/276:00 am
STL
- SYD
1 stop34h 05m
American Airlines
Deal found 5/4![American Airlines logo]()
$1,242
This Kiwi.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/111:25 pm
MEL
- ORD
2 stops31h 52m
Multiple Airlines
Mon 8/179:13 pm
ORD
- MEL
1 stop42h 32m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$1,250
This Jettzy deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:10 am
SYD
- STL
1 stop29h 49m
Qantas Airways
Thu 5/286:35 am
STL
- SYD
1 stop33h 30m
Qantas Airways
Deal found 4/30![Qantas Airways logo]()
$1,254
This Delta deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:15 am
SYD
- STL
2 stops23h 31m
Delta
Thu 5/289:13 am
STL
- SYD
2 stops30h 37m
Delta
Deal found 5/2![Delta logo]()
$1,257
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2010:20 am
SYD
- STL
1 stop23h 02m
United Airlines
Thu 5/287:23 pm
STL
- SYD
1 stop20h 32m
United Airlines
Deal found 5/2![United Airlines logo]()
$1,277
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:00 pm
MEL
- STL
2 stops22h 56m
Delta
Tue 1/197:30 am
STL
- MEL
2 stops33h 20m
Delta
Deal found 5/1![Delta logo]()
$1,290
Best flights from Australia to IllinoisDiscover carefully curated flight deals from Australia to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 5, 2026.
Discover carefully curated flight deals from Australia to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 5, 2026.
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:20 am
SYD
- STL
2 stops26h 05m
Air Canada
Thu 5/281:05 pm
STL
- SYD
3 stops51h 15m
Air Canada
Deal found 4/30![Air Canada logo]()
$1,207
This American Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:10 am
SYD
- STL
1 stop29h 49m
American Airlines
Thu 5/289:41 am
STL
- SYD
2 stops30h 24m
American Airlines
Deal found 4/30![American Airlines logo]()
$1,228
This Jettzy deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:10 am
SYD
- STL
1 stop29h 49m
Qantas Airways
Thu 5/286:35 am
STL
- SYD
1 stop33h 30m
Qantas Airways
Deal found 4/30![Qantas Airways logo]()
$1,254
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2010:20 am
SYD
- STL
1 stop23h 02m
United Airlines
Thu 5/282:57 pm
STL
- SYD
2 stops25h 03m
United Airlines
Deal found 5/3![United Airlines logo]()
$1,277
This BYOjet deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2810:15 am
ADL
- ORD
2 stops47h 35m
Multiple Airlines
Mon 11/308:42 pm
ORD
- ADL
2 stops43h 38m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$1,632
This BYOjet deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/79:40 am
BNE
- ORD
2 stops28h 36m
Air New Zealand
Mon 8/244:20 pm
ORD
- BNE
2 stops27h 45m
Air New Zealand
Deal found 5/4![Air New Zealand logo]()
$1,698
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/49:15 am
SYD
- MDW
2 stops23h 41m
Delta
Wed 8/122:00 pm
MDW
- SYD
2 stops25h 50m
Delta
Deal found 5/1![Delta logo]()
$1,699
This BYOjet deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/1510:55 pm
PER
- ORD
1 stop29h 10m
Qatar Airways
Mon 6/224:33 pm
ORD
- PER
2 stops37h 02m
Qatar Airways
Deal found 5/1![Qatar Airways logo]()
$1,887
This Air Tahiti Nui deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Tahiti Nui is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/186:35 am
MEL
- ORD
3 stops30h 25m
Air Tahiti Nui
Thu 6/258:55 pm
ORD
- MEL
3 stops51h 55m
Air Tahiti Nui
Deal found 5/4![Air Tahiti Nui logo]()
$2,062
This Bravofly deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/317:45 pm
ADL
- ORD
2 stops56h 40m
Cathay Pacific
Sun 6/74:15 pm
ORD
- ADL
2 stops50h 40m
Cathay Pacific
Deal found 5/2![Cathay Pacific logo]()
$2,109
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/38:30 pm
MEL
- STL
3 stops38h 39m
Air Canada
Sun 6/78:40 am
STL
- MEL
3 stops35h 25m
Air Canada
Deal found 4/30![Air Canada logo]()
$1,319
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/710:55 am
MEL
- STL
2 stops23h 36m
United Airlines
Sun 9/271:27 pm
STL
- MEL
2 stops27h 48m
United Airlines
Deal found 5/3![United Airlines logo]()
$1,443
This Alaska Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/68:45 pm
SYD
- ORD
2 stops35h 03m
Multiple Airlines
Tue 6/305:42 pm
ORD
- SYD
2 stops34h 08m
Multiple Airlines
Deal found 5/2![Multiple Airlines logo]()
$1,660
This United Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/810:55 am
MEL
- ORD
2 stops23h 10m
United Airlines
Mon 8/173:55 pm
ORD
- MEL
2 stops24h 35m
United Airlines
Deal found 5/4![United Airlines logo]()
$1,522
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/49:15 am
SYD
- ORD
2 stops26h 11m
Delta
Wed 8/122:36 pm
ORD
- SYD
1 stop25h 14m
Delta
Deal found 5/5![Delta logo]()
$1,705
This Qantas Airways deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/139:10 am
SYD
- ORD
1 stop21h 49m
Qantas Airways
Mon 8/107:00 pm
ORD
- SYD
1 stop21h 05m
Qantas Airways
Deal found 5/4![Qantas Airways logo]()
$1,757
This Fiji Airways deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Fiji Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/711:35 am
BNE
- ORD
2 stops25h 25m
Multiple Airlines
Mon 8/243:21 pm
ORD
- BNE
2 stops28h 14m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$1,671
This American Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/78:35 pm
BNE
- ORD
2 stops23h 52m
American Airlines
Mon 8/243:21 pm
ORD
- BNE
1 stop22h 39m
American Airlines
Deal found 5/4![American Airlines logo]()
$1,871
This Delta deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/119:15 am
SYD
- MDW
2 stops24h 03m
Delta
Mon 7/201:49 pm
MDW
- SYD
2 stops26h 01m
Delta
Deal found 5/4![Delta logo]()
$1,710
This oojo deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1610:45 pm
PER
- ORD
1 stop29h 20m
Qatar Airways
Tue 6/234:33 pm
ORD
- PER
2 stops37h 02m
Qatar Airways
Deal found 5/2![Qatar Airways logo]()
$2,002
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:20 am
SYD
- ORD
2 stops23h 31m
United Airlines
Tue 7/76:20 pm
ORD
- SYD
1 stop21h 35m
United Airlines
Deal found 5/5![United Airlines logo]()
$1,723
This Qantas Airways deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/198:50 pm
BNE
- ORD
2 stops32h 37m
Qantas Airways
Sun 8/27:08 pm
ORD
- BNE
2 stops27h 07m
Qantas Airways
Deal found 5/1![Qantas Airways logo]()
$1,911
This Air New Zealand deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/311:55 am
SYD
- STL
3 stops27h 02m
Multiple Airlines
Thu 8/271:18 pm
STL
- SYD
3 stops28h 27m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$1,740
This Delta deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/139:15 am
SYD
- MDW
2 stops23h 56m
Delta
Wed 7/221:18 pm
MDW
- SYD
2 stops26h 32m
Delta
Deal found 5/4![Delta logo]()
$1,761
This oojo deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:50 pm
PER
- ORD
2 stops46h 15m
Air New Zealand
Tue 6/94:45 pm
ORD
- PER
2 stops34h 15m
Air New Zealand
Deal found 5/2![Air New Zealand logo]()
$2,182
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1610:20 am
SYD
- ORD
2 stops21h 44m
United Airlines
Sat 6/69:48 pm
ORD
- SYD
1 stop42h 07m
United Airlines
Deal found 5/2![United Airlines logo]()
$1,759
This Delta deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/139:15 am
SYD
- ORD
2 stops23h 12m
Delta
Wed 7/222:02 pm
ORD
- SYD
2 stops25h 48m
Delta
Deal found 5/4![Delta logo]()
$1,761
This BYOjet deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/166:20 pm
ADL
- ORD
2 stops35h 15m
Qatar Airways
Tue 6/234:33 pm
ORD
- ADL
2 stops32h 27m
Qatar Airways
Deal found 5/2![Qatar Airways logo]()
$2,136
This EVA Air deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/610:15 pm
BNE
- MDW
2 stops34h 25m
Multiple Airlines
Sat 6/209:00 pm
MDW
- BNE
2 stops32h 00m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$1,788
This Qantas Airways deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:35 pm
BNE
- ORD
1 stop39h 47m
Qantas Airways
Wed 10/73:14 pm
ORD
- BNE
1 stop22h 46m
Qantas Airways
Deal found 5/2![Qantas Airways logo]()
$1,996
Last-minute flights from Australia to IllinoisDiscover last-minute flight deals from Australia to Illinois. Data last updated May 5, 2026 and is based on user searches.
Discover last-minute flight deals from Australia to Illinois. Data last updated May 5, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1310:20 am
SYD
- STL
2 stops21h 37m
United Airlines
Sat 6/67:05 pm
STL
- SYD
2 stops44h 50m
United Airlines
Deal found 5/4![United Airlines logo]()
$1,223
This Aunt Betty deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Aunt Betty is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1312:00 pm
SYD
- STL
1 stop22h 30m
Qantas Airways
Sat 6/67:21 pm
STL
- SYD
1 stop20h 34m
Qantas Airways
Deal found 5/4![Qantas Airways logo]()
$1,232
This American Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/139:10 am
SYD
- STL
2 stops22h 31m
American Airlines
Sat 6/67:21 pm
STL
- SYD
1 stop20h 34m
American Airlines
Deal found 5/4![American Airlines logo]()
$1,242
This Kiwi.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/185:50 pm
SYD
- ORD
1 stop27h 49m
Multiple Airlines
Sun 5/248:46 pm
ORD
- SYD
1 stop43h 44m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$1,308
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:20 am
SYD
- STL
2 stops41h 46m
Multiple Airlines
Thu 5/284:48 pm
STL
- SYD
2 stops23h 32m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$1,163
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:20 am
SYD
- STL
2 stops26h 05m
Air Canada
Thu 5/281:05 pm
STL
- SYD
3 stops51h 15m
Air Canada
Deal found 4/30![Air Canada logo]()
$1,207
This American Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:10 am
SYD
- STL
1 stop29h 49m
American Airlines
Thu 5/289:41 am
STL
- SYD
2 stops30h 24m
American Airlines
Deal found 4/30![American Airlines logo]()
$1,228
This Jettzy deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:10 am
SYD
- STL
1 stop29h 49m
Qantas Airways
Thu 5/286:35 am
STL
- SYD
1 stop33h 30m
Qantas Airways
Deal found 4/30![Qantas Airways logo]()
$1,254
This Delta deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:15 am
SYD
- STL
2 stops23h 31m
Delta
Thu 5/289:13 am
STL
- SYD
2 stops30h 37m
Delta
Deal found 5/2![Delta logo]()
$1,257
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2010:20 am
SYD
- STL
1 stop23h 02m
United Airlines
Thu 5/287:23 pm
STL
- SYD
1 stop20h 32m
United Airlines
Deal found 5/2![United Airlines logo]()
$1,277
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/210:20 am
SYD
- STL
1 stop22h 57m
United Airlines
Tue 6/94:48 pm
STL
- SYD
2 stops23h 07m
United Airlines
Deal found 5/3![United Airlines logo]()
$1,227
This Air Canada deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/38:30 pm
MEL
- STL
3 stops38h 39m
Air Canada
Sun 6/78:40 am
STL
- MEL
3 stops35h 25m
Air Canada
Deal found 4/30![Air Canada logo]()
$1,319
One-way flights from Australia to IllinoisSearch for one-way flight options from Australia to Illinois. Find affordable one-way fares based on user searches. Data last updated May 5, 2026.
Search for one-way flight options from Australia to Illinois. Find affordable one-way fares based on user searches. Data last updated May 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/61:15 pm
SYD
- ORD
3 stops31h 13m
Multiple Airlines
Deal found 5/3![Multiple Airlines logo]()
$617
This Kiwi.com deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/91:30 pm
MEL
- ORD
3 stops30h 58m
Multiple Airlines
Deal found 5/3![Multiple Airlines logo]()
$652
This Kiwi.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2511:55 pm
MEL
- ORD
3 stops45h 39m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$656
This Kiwi.com deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:50 pm
MEL
- ORD
3 stops48h 12m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$675
This Kiwi.com deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/71:15 pm
SYD
- ORD
2 stops32h 02m
Multiple Airlines
Deal found 5/3![Multiple Airlines logo]()
$688
This Kiwi.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3111:55 am
BNE
- ORD
3 stops35h 08m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$692
This Kiwi.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/295:50 pm
SYD
- ORD
1 stop27h 44m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$737
This Trip.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/21:30 pm
MEL
- ORD
2 stops31h 47m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$742
This KAYAK deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:10 am
SYD
- STL
2 stops22h 18m
Qantas Airways
Deal found 5/4![Qantas Airways logo]()
$745
This Qantas Airways deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/3012:00 pm
SYD
- STL
1 stop22h 51m
Multiple Airlines
Deal found 5/5![Multiple Airlines logo]()
$749
This Kiwi.com deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2411:55 pm
MEL
- ORD
3 stops45h 39m
Multiple Airlines
Deal found 5/4![Multiple Airlines logo]()
$755
This Kiwi.com deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/88:45 pm
SYD
- ORD
3 stops48h 32m
Multiple Airlines
Deal found 5/3![Multiple Airlines logo]()
$774
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 May 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,130 (American Airlines) |
One-way from | $617 (Kiwi.com) |
Popular in | April |
Cheapest in | August |
Average price | $1,221 |
Cheapflights Fare Finder
Customize 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 2,558,603 searches. Data last updated May 5, 2026.
Use the filters below to find and compare flights from Australia to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 5/20
9:20 am-8:25 pm
2 stops26h 05m
Lambert-St Louis
Thu 5/28
1:05 pm-7:20 am
3 stops51h 15m
$1,207
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 5/20
9:10 am-11:59 pm
1 stop29h 49m
Lambert-St Louis
Thu 5/28
9:41 am-7:05 am
2 stops30h 24m
$1,228
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 5/20
9:10 am-11:59 pm
1 stop29h 49m
Lambert-St Louis
Thu 5/28
6:35 am-7:05 am
1 stop33h 30m
$1,254
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 5/20
10:20 am-6:22 pm
1 stop23h 02m
Lambert-St Louis
Thu 5/28
2:57 pm-7:00 am
2 stops25h 03m
$1,277
MelbourneSt. Louis
MEL - STL
MELSTL
Melbourne
Wed 6/3
8:30 pm-8:09 pm
3 stops38h 39m
Lambert-St Louis
Sun 6/7
8:40 am-11:05 am
3 stops35h 25m
$1,319
MelbourneSt. Louis
MEL - STL
MELSTL
Melbourne
Mon 9/7
10:55 am-7:31 pm
2 stops23h 36m
Lambert-St Louis
Sun 9/27
1:27 pm-8:15 am
2 stops27h 48m
$1,443
MelbourneChicago
MEL - ORD
MELORD
Melbourne
Sat 8/8
10:55 am-7:05 pm
2 stops23h 10m
Chicago O'Hare Intl
Mon 8/17
3:55 pm-7:30 am
2 stops24h 35m
$1,522
AdelaideChicago
ADL - ORD
ADLORD
Adelaide
Wed 10/28
10:15 am-6:20 pm
2 stops47h 35m
Chicago O'Hare Intl
Mon 11/30
8:42 pm-8:50 am
2 stops43h 38m
$1,632
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Sat 6/6
8:45 pm-4:48 pm
2 stops35h 03m
Chicago O'Hare Intl
Tue 6/30
5:42 pm-6:50 pm
2 stops34h 08m
$1,660
BrisbaneChicago
BNE - ORD
BNEORD
Brisbane
Fri 8/7
11:35 am-10:00 pm
2 stops25h 25m
Chicago O'Hare Intl
Mon 8/24
3:21 pm-10:35 am
2 stops28h 14m
$1,671
Showing 1-10 of 60 resultsSorted by cheapest first
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.
SYD-STL
ADL-ORD
BNE-ORD
SYD-MDW
PER-ORD
Estimated round-trip 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
AU0-USIL
SYD-STL
ADL-ORD
BNE-ORD
SYD-MDW
How far ahead should I book a flight from Australia to Illinois?
The best time to book flights from Australia to Illinois is 63 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 Australia to Illinois?
Currently, September is the cheapest month in which you can book a flight from Australia to Illinois (average of $123). Flying from Australia to Illinois in January is currently the most expensive (average of $842). 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 May 5, 2026.
Peruse reviews from past customers who have flown with Japan Airlines,Qantas Airways, andUnited Airlines from Australia to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.2
Entertainment
7.8
Boarding
8.4
Food
7.7
Overall
8.3
Crew
8.7
Reviews
1 / 20
8.0
ExcellentEvan,Feb 2026
NRT - ORD
Comfort
8.2
Entertainment
7.8
Boarding
8.4
Food
7.7
Overall
8.3
Crew
8.7
Reviews
1 / 20
8.0
ExcellentEvan,Feb 2026
NRT - ORD
Comfort
8.2
Entertainment
7.8
Boarding
8.4
Food
7.7
Overall
8.3
Crew
8.7
Reviews
1 / 20
8.0
ExcellentEvan,Feb 2026
NRT - ORD
Comfort
8.2
Entertainment
7.8
Boarding
8.4
Food
7.7
Overall
8.3
Crew
8.7
Reviews
1 / 20
8.0
ExcellentEvan,Feb 2026
NRT - ORD
Comfort
8.2
Entertainment
7.8
Boarding
8.4
Food
7.7
Overall
8.3
Crew
8.7
Reviews
1 / 20
8.0
ExcellentEvan,Feb 2026
NRT - ORD
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.
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.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Australia to Illinois by cabin class
Find flights from Australia to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Australia and Illinois flights
Browse other Australia and Illinois flight options. Last updated on May 5, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Illinois
Find the right flight back to Australia after your stay in Illinois
Australia to Illinois flights
Consider these flights traveling from Australia to Illinois.
Top 4 airlines flying from Australia to Illinois
Discover the top 4 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 2,558,603 searches. Data last updated May 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$795 | Average$1,155 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$862 | Average$966 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$970 | Average$1,012 | FlexibilityNo cancel fee | On-time74% | |
| Cheapest$973 | Average$976 | FlexibilityNo cancel fee | On-time79% |