$631+ Cheap flights from Sydney (SYD) 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
Jun 12 — Jun 191
Round-trip
1 adult, Economy
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Cheapest flights from Sydney to IllinoisExplore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 13, 2026.
Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 13, 2026.
This American Airlines deal was found by Cheapflights users on 5/11. 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.
Tue 9/89:10 am
SYD
- ORD
2 stops25h 42m
American Airlines
Mon 9/217:01 pm
ORD
- SYD
1 stop21h 04m
American Airlines
Deal found 5/11![American Airlines logo]()
$1,033
This United Airlines deal was found by Cheapflights users on 5/13. 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 8/1210:20 am
SYD
- STL
1 stop23h 19m
United Airlines
Sat 9/55:59 pm
STL
- SYD
2 stops45h 56m
United Airlines
Deal found 5/13![United Airlines logo]()
$1,042
This Delta deal was found by Cheapflights users on 5/11. 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 9/109:15 am
SYD
- ORD
2 stops24h 24m
Delta
Mon 9/213:50 pm
ORD
- SYD
2 stops24h 00m
Delta
Deal found 5/11![Delta logo]()
$1,052
This American Airlines deal was found by Cheapflights users on 5/12. 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.
Sat 10/3111:15 am
SYD
- ORD
1 stop34h 46m
American Airlines
Wed 11/48:35 am
ORD
- SYD
1 stop28h 35m
American Airlines
Deal found 5/12![American Airlines logo]()
$1,073
This American Airlines deal was found by Cheapflights users on 5/9. 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
2 stops25h 20m
American Airlines
Thu 5/281:19 pm
STL
- SYD
2 stops26h 46m
American Airlines
Deal found 5/9![American Airlines logo]()
$1,074
This American Airlines deal was found by Cheapflights users on 5/9. 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.
Thu 9/109:10 am
SYD
- ORD
1 stop22h 35m
American Airlines
Thu 9/247:01 pm
ORD
- SYD
1 stop21h 04m
American Airlines
Deal found 5/9![American Airlines logo]()
$1,082
This American Airlines deal was found by Cheapflights users on 5/8. 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 10/1910:10 am
SYD
- ORD
1 stop22h 40m
American Airlines
Sat 10/313:14 pm
ORD
- SYD
1 stop24h 46m
American Airlines
Deal found 5/8![American Airlines logo]()
$1,083
This American Airlines deal was found by Cheapflights users on 5/11. 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 9/119:10 am
SYD
- ORD
1 stop21h 40m
American Airlines
Sun 9/207:01 pm
ORD
- SYD
1 stop21h 04m
American Airlines
Deal found 5/11![American Airlines logo]()
$1,084
This American Airlines deal was found by Cheapflights users on 5/13. 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 8/129:10 am
SYD
- STL
1 stop28h 45m
American Airlines
Sat 9/55:11 pm
STL
- SYD
1 stop22h 44m
American Airlines
Deal found 5/13![American Airlines logo]()
$1,088
This American Airlines deal was found by Cheapflights users on 5/13. 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.
Thu 10/19:10 am
SYD
- ORD
1 stop27h 12m
American Airlines
Fri 10/98:25 pm
ORD
- SYD
1 stop43h 05m
American Airlines
Deal found 5/13![American Airlines logo]()
$1,088
This Ovago deal was found by Cheapflights users on 5/9. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:10 am
SYD
- ORD
1 stop22h 35m
Qantas Airways
Thu 9/243:52 pm
ORD
- SYD
1 stop24h 13m
Qantas Airways
Deal found 5/9![Qantas Airways logo]()
$1,091
This American Airlines deal was found by Cheapflights users on 5/11. 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.
Sat 9/1212:00 pm
SYD
- ORD
1 stop21h 24m
American Airlines
Mon 9/217:01 pm
ORD
- SYD
1 stop21h 04m
American Airlines
Deal found 5/11![American Airlines logo]()
$1,092
Best flights from Sydney to IllinoisDiscover carefully curated flight deals from Sydney to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 13, 2026.
Discover carefully curated flight deals from Sydney to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 13, 2026.
This United Airlines deal was found by Cheapflights users on 5/12. 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 6/109:30 am
SYD
- STL
2 stops26h 40m
United Airlines
Wed 6/171:38 pm
STL
- SYD
2 stops26h 22m
United Airlines
Deal found 5/12![United Airlines logo]()
$1,042
This American Airlines deal was found by Cheapflights users on 5/10. 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 8/129:10 am
SYD
- STL
1 stop28h 45m
American Airlines
Sat 9/512:45 pm
STL
- SYD
1 stop27h 10m
American Airlines
Deal found 5/10![American Airlines logo]()
$1,092
This Air Canada deal was found by Cheapflights users on 5/11. 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 6/39:20 am
SYD
- STL
2 stops26h 50m
Air Canada
Sun 6/78:40 am
STL
- SYD
2 stops31h 40m
Air Canada
Deal found 5/11![Air Canada logo]()
$1,221
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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.
Thu 6/48:45 pm
SYD
- ORD
2 stops37h 05m
Multiple Airlines
Wed 8/128:20 pm
ORD
- SYD
2 stops31h 30m
Multiple Airlines
Deal found 5/9![Multiple Airlines logo]()
$1,591
This Qantas Airways deal was found by Cheapflights users on 5/11. 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.
Tue 6/26:00 am
SYD
- ORD
2 stops24h 52m
Qantas Airways
Tue 6/236:59 pm
ORD
- SYD
1 stop21h 06m
Qantas Airways
Deal found 5/11![Qantas Airways logo]()
$1,649
This Delta deal was found by Cheapflights users on 5/13. 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 8/121:52 pm
MDW
- SYD
2 stops25h 58m
Delta
Deal found 5/13![Delta logo]()
$1,714
This United Airlines deal was found by Cheapflights users on 5/13. 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 8/1210:20 am
SYD
- STL
1 stop23h 19m
United Airlines
Sat 9/55:59 pm
STL
- SYD
2 stops45h 56m
United Airlines
Deal found 5/13![United Airlines logo]()
$1,042
This United Airlines deal was found by Cheapflights users on 5/10. 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 8/129:30 am
SYD
- STL
2 stops26h 08m
United Airlines
Fri 9/44:40 pm
STL
- SYD
2 stops23h 20m
United Airlines
Deal found 5/10![United Airlines logo]()
$1,096
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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.
Fri 6/58:45 pm
SYD
- ORD
2 stops37h 05m
Multiple Airlines
Wed 8/128:20 pm
ORD
- SYD
2 stops31h 30m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$1,618
This Delta deal was found by Cheapflights users on 5/13. 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 10/19:15 am
SYD
- MDW
2 stops27h 31m
Delta
Fri 10/912:30 pm
MDW
- SYD
2 stops27h 20m
Delta
Deal found 5/13![Delta logo]()
$1,716
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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.
Sun 5/318:45 pm
SYD
- ORD
2 stops42h 10m
Multiple Airlines
Wed 6/107:20 am
ORD
- SYD
2 stops44h 30m
Multiple Airlines
Deal found 5/8![Multiple Airlines logo]()
$1,640
This Delta deal was found by Cheapflights users on 5/8. 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 5/289:15 am
SYD
- ORD
2 stops22h 36m
Delta
Mon 6/81:46 pm
ORD
- SYD
2 stops26h 04m
Delta
Deal found 5/8![Delta logo]()
$1,717
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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 5/308:45 pm
SYD
- ORD
2 stops31h 29m
Multiple Airlines
Fri 6/125:42 pm
ORD
- SYD
2 stops34h 08m
Multiple Airlines
Deal found 5/8![Multiple Airlines logo]()
$1,662
This Delta deal was found by Cheapflights users on 5/12. 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 stops28h 02m
Delta
Mon 7/209:49 am
MDW
- SYD
2 stops30h 01m
Delta
Deal found 5/12![Delta logo]()
$1,718
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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.
Tue 6/28:45 pm
SYD
- ORD
3 stops24h 35m
Multiple Airlines
Wed 6/108:05 pm
ORD
- SYD
2 stops31h 45m
Multiple Airlines
Deal found 5/8![Multiple Airlines logo]()
$1,673
This Delta deal was found by Cheapflights users on 5/13. 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.
Sun 6/219:15 am
SYD
- MDW
2 stops24h 03m
Delta
Sun 7/199:49 am
MDW
- SYD
2 stops30h 01m
Delta
Deal found 5/13![Delta logo]()
$1,765
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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.
Tue 6/98:45 pm
SYD
- ORD
3 stops30h 18m
Multiple Airlines
Thu 6/116:42 pm
ORD
- SYD
2 stops33h 08m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$1,688
This Delta deal was found by Cheapflights users on 5/9. 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 6/39:15 am
SYD
- MDW
2 stops26h 54m
Delta
Sat 6/131:49 pm
MDW
- SYD
2 stops26h 01m
Delta
Deal found 5/9![Delta logo]()
$1,766
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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.
Tue 5/268:45 pm
SYD
- ORD
3 stops24h 35m
Multiple Airlines
Fri 5/297:49 pm
ORD
- SYD
2 stops32h 01m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$1,694
This Delta deal was found by Cheapflights users on 5/12. 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.
Sun 6/149:15 am
SYD
- MDW
2 stops24h 16m
Delta
Mon 7/209:19 am
MDW
- SYD
2 stops30h 31m
Delta
Deal found 5/12![Delta logo]()
$1,768
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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.
Thu 6/118:45 pm
SYD
- ORD
2 stops23h 15m
Multiple Airlines
Thu 7/235:42 pm
ORD
- SYD
2 stops34h 08m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$1,714
This Delta deal was found by Cheapflights users on 5/10. 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.
Sun 6/79:15 am
SYD
- MDW
2 stops28h 02m
Delta
Sun 6/141:26 pm
MDW
- SYD
2 stops26h 24m
Delta
Deal found 5/10![Delta logo]()
$1,770
This Etihad Airways deal was found by Cheapflights users on 5/11. 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 Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/123:40 pm
SYD
- ORD
2 stops40h 06m
Multiple Airlines
Sat 7/259:10 pm
ORD
- SYD
1 stop42h 00m
Multiple Airlines
Deal found 5/11![Multiple Airlines logo]()
$1,774
This Delta deal was found by Cheapflights users on 5/10. 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 7/99:15 am
SYD
- ORD
2 stops25h 15m
Delta
Thu 7/301:44 pm
ORD
- SYD
2 stops26h 06m
Delta
Deal found 5/10![Delta logo]()
$1,826
Last-minute flights from Sydney to IllinoisDiscover last-minute flight deals from Sydney to Illinois. Data last updated May 13, 2026 and is based on user searches.
Discover last-minute flight deals from Sydney to Illinois. Data last updated May 13, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 5/9. 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 5/286:35 am
STL
- SYD
1 stop33h 30m
American Airlines
Deal found 5/9![American Airlines logo]()
$1,074
This United Airlines deal was found by Cheapflights users on 5/8. 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
2 stops21h 37m
United Airlines
Thu 5/282:57 pm
STL
- SYD
2 stops24h 58m
United Airlines
Deal found 5/8![United Airlines logo]()
$1,094
This Trip.com deal was found by Cheapflights users on 5/12. 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.
Tue 5/266:00 am
SYD
- ORD
3 stops56h 13m
Multiple Airlines
Fri 5/296:55 am
ORD
- SYD
3 stops37h 55m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$1,123
This Trip.com deal was found by Cheapflights users on 5/12. 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.
Tue 5/261:15 pm
SYD
- MDW
3 stops36h 54m
Multiple Airlines
Fri 5/296:00 am
MDW
- SYD
3 stops38h 50m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$1,139
This Qantas Airways deal was found by Cheapflights users on 5/8. 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 5/279:00 am
SYD
- ORD
2 stops25h 33m
Qantas Airways
Mon 6/83:50 pm
ORD
- SYD
2 stops25h 25m
Qantas Airways
Deal found 5/8![Qantas Airways logo]()
$1,383
This Trip.com deal was found by Cheapflights users on 5/10. 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.
Tue 6/21:15 pm
SYD
- ORD
3 stops46h 17m
Multiple Airlines
Fri 6/197:20 am
ORD
- SYD
3 stops37h 30m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$1,166
This American Airlines deal was found by Cheapflights users on 5/9. 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 6/39:10 am
SYD
- STL
2 stops43h 42m
American Airlines
Sun 6/75:18 pm
STL
- SYD
1 stop22h 37m
American Airlines
Deal found 5/9![American Airlines logo]()
$1,154
This Trip.com deal was found by Cheapflights users on 5/10. 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 6/71:15 pm
SYD
- ORD
3 stops46h 17m
Multiple Airlines
Sun 6/146:55 am
ORD
- SYD
3 stops48h 15m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$1,250
This Air Canada deal was found by Cheapflights users on 5/9. 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.
Mon 6/89:20 am
SYD
- STL
2 stops50h 05m
Air Canada
Sun 6/141:05 pm
STL
- SYD
2 stops51h 15m
Air Canada
Deal found 5/9![Air Canada logo]()
$1,138
This United Airlines deal was found by Cheapflights users on 5/12. 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 6/109:30 am
SYD
- STL
2 stops26h 40m
United Airlines
Wed 6/171:38 pm
STL
- SYD
2 stops26h 22m
United Airlines
Deal found 5/12![United Airlines logo]()
$1,042
This oojo deal was found by Cheapflights users on 5/12. 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.
Wed 6/1012:00 pm
SYD
- STL
1 stop19h 33m
Qantas Airways
Wed 6/176:35 am
STL
- SYD
1 stop33h 30m
Qantas Airways
Deal found 5/12![Qantas Airways logo]()
$1,117
This Trip.com deal was found by Cheapflights users on 5/12. 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 6/142:10 pm
SYD
- ORD
3 stops53h 57m
Multiple Airlines
Mon 7/207:15 am
ORD
- SYD
3 stops37h 35m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$1,158
One-way flights from Sydney to IllinoisSearch for one-way flight options from Sydney to Illinois. Find affordable one-way fares based on user searches. Data last updated May 13, 2026.
Search for one-way flight options from Sydney to Illinois. Find affordable one-way fares based on user searches. Data last updated May 13, 2026.
This Trip.com deal was found by Cheapflights users on 5/10. 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.
Mon 8/241:15 pm
SYD
- ORD
2 stops32h 04m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$631
This Kiwi.com deal was found by Cheapflights users on 5/12. 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 10/312:00 pm
SYD
- ORD
3 stops39h 02m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$640
This KAYAK deal was found by Cheapflights users on 5/13. 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 stops24h 23m
Qantas Airways
Deal found 5/13![Qantas Airways logo]()
$643
This KAYAK deal was found by Cheapflights users on 5/11. 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 9/109:10 am
SYD
- ORD
1 stop22h 35m
Qantas Airways
Deal found 5/11![Qantas Airways logo]()
$643
This KAYAK deal was found by Cheapflights users on 5/13. 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 7/3010:20 am
SYD
- STL
1 stop22h 57m
Air New Zealand
Deal found 5/13![Air New Zealand logo]()
$648
This Delta deal was found by Cheapflights users on 5/12. 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 9/109:15 am
SYD
- ORD
2 stops29h 42m
Delta
Deal found 5/12![Delta logo]()
$649
This Kiwi.com deal was found by Cheapflights users on 5/12. 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.
Wed 6/101:15 pm
SYD
- ORD
3 stops30h 52m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$656
This KAYAK deal was found by Cheapflights users on 5/12. 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.
Sat 10/3111:15 am
SYD
- ORD
1 stop20h 48m
Qantas Airways
Deal found 5/12![Qantas Airways logo]()
$709
This Trip.com deal was found by Cheapflights users on 5/13. 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.
Wed 7/159:10 am
SYD
- ORD
1 stop36h 07m
Multiple Airlines
Deal found 5/13![Multiple Airlines logo]()
$720
This Kiwi.com deal was found by Cheapflights users on 5/12. 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 11/52:00 pm
SYD
- STL
3 stops26h 56m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$731
This Kiwi.com deal was found by Cheapflights users on 5/10. 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.
Wed 8/261:15 pm
SYD
- STL
3 stops49h 44m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$744
This Kiwi.com deal was found by Cheapflights users on 5/10. 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 8/271:15 pm
SYD
- STL
3 stops42h 48m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$751
Find flight deals from Sydney to Illinois
Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated May 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,033 (American Airlines) |
One-way from | $631 (Trip.com) |
Popular in | December |
Cheapest in | August |
Average price | $1,166 |
Cheapflights Fare Finder
Customize your flight search to find flights from Sydney 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 13, 2026.
Use the filters below to find and compare flights from Sydney 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 6/10
9:30 am-9:10 pm
2 stops26h 40m
Lambert-St Louis
Wed 6/17
1:38 pm-7:00 am
2 stops26h 22m
$1,042
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 8/12
10:20 am-6:39 pm
1 stop23h 19m
Lambert-St Louis
Sat 9/5
5:59 pm-6:55 am
2 stops45h 56m
$1,042
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 8/12
9:10 am-10:55 pm
1 stop28h 45m
Lambert-St Louis
Sat 9/5
12:45 pm-6:55 am
1 stop27h 10m
$1,092
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 8/12
9:30 am-8:38 pm
2 stops26h 08m
Lambert-St Louis
Fri 9/4
4:40 pm-7:00 am
2 stops23h 20m
$1,096
SydneySt. Louis
SYD - STL
SYDSTL
Sydney Kingsford Smith
Wed 6/3
9:20 am-9:10 pm
2 stops26h 50m
Lambert-St Louis
Sun 6/7
8:40 am-7:20 am
2 stops31h 40m
$1,221
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Thu 6/4
8:45 pm-6:50 pm
2 stops37h 05m
Chicago O'Hare Intl
Wed 8/12
8:20 pm-6:50 pm
2 stops31h 30m
$1,591
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Fri 6/5
8:45 pm-6:50 pm
2 stops37h 05m
Chicago O'Hare Intl
Wed 8/12
8:20 pm-6:50 pm
2 stops31h 30m
$1,618
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Sun 5/31
8:45 pm-11:55 pm
2 stops42h 10m
Chicago O'Hare Intl
Wed 6/10
7:20 am-6:50 pm
2 stops44h 30m
$1,640
Quickest round-trip
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Tue 6/2
6:00 am-3:52 pm
2 stops24h 52m
Chicago O'Hare Intl
Tue 6/23
6:59 pm-7:05 am
1 stop21h 06m
$1,649
SydneyChicago
SYD - ORD
SYDORD
Sydney Kingsford Smith
Sat 5/30
8:45 pm-1:14 pm
2 stops31h 29m
Chicago O'Hare Intl
Fri 6/12
5:42 pm-6:50 pm
2 stops34h 08m
$1,662
Showing 1-10 of 47 resultsSorted by cheapest first
Best time to book a flight from Sydney to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Sydney with our price prediction graph.
SYD-ORD
SYD-STL
SYD-MDW
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 Sydney to Illinois
SYD-USIL
SYD-ORD
SYD-STL
SYD-MDW
How far ahead should I book a flight from Sydney to Illinois?
Booking 36 days in advance of your planned departure date is, on average, the best time to get cheap flights from Sydney to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from Sydney to Illinois?
Currently, December is the cheapest month in which you can book a flight from Sydney to Illinois (average of $468). Flying from Sydney to Illinois in February is currently the most expensive (average of $865). 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.
How much does it cost to fly round-trip from Sydney to Illinois?
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 13, 2026.
Get a feel of what it's like to fly with Qantas Airways and United Airlines from Sydney to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Entertainment
7.2
Crew
8.1
Boarding
7.7
Comfort
7.4
Overall
7.5
Reviews
1 / 20
10.0
ExcellentTania,May 2026
SYD - DFW
Food
7.0
Entertainment
7.2
Crew
8.1
Boarding
7.7
Comfort
7.4
Overall
7.5
Reviews
1 / 20
10.0
ExcellentTania,May 2026
SYD - DFW
Food
7.0
Entertainment
7.2
Crew
8.1
Boarding
7.7
Comfort
7.4
Overall
7.5
Reviews
1 / 20
10.0
ExcellentTania,May 2026
SYD - DFW
Related info for your journey
Find useful and relevant information for your journey from Sydney to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Sydney 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 Sydney to Illinois by cabin class
Find flights from Sydney to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Sydney and Illinois flights
Browse other Sydney and Illinois flight options. Last updated on May 13, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Sydney to Illinois
Discover the top 2 airlines that operate flights from Sydney 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 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$795 | Average$1,155 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$970 | Average$1,265 | FlexibilityNo cancel fee | On-time74% |