$586+ Cheap flights from Illinois to Sydney (SYD)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
Dec 9 — Dec 161
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Sydney with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Sydney
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Cheapest flights from Illinois to SydneyExplore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 9, 2026.
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 9, 2026.
This Philippine Airlines deal was found by Cheapflights users on 11/5. 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 Philippine Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/86:29 am -
2 stops34h 21m
Wed 11/1811:30 am -
2 stops34h 32m
Deal found 11/5![Multiple Airlines logo]()
$1,307
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/49:05 pm -
1 stop40h 20m
Fri 12/117:15 pm -
2 stops38h 00m
Deal found 11/4![Qantas Airways logo]()
$1,339
This Justfly.com deal was found by Cheapflights users on 11/8. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/12:22 pm -
2 stops25h 13m
Tue 1/2611:50 am -
2 stops25h 45m
Deal found 11/8![Air New Zealand logo]()
$1,344
This oojo deal was found by Cheapflights users on 11/6. 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.
Sun 11/85:30 am -
2 stops34h 05m
Wed 11/182:05 pm -
2 stops23h 32m
Deal found 11/6![Air New Zealand logo]()
$1,346
This KAYAK deal was found by Cheapflights users on 11/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
2 stops34h 35m
Mon 1/252:05 pm -
2 stops23h 33m
Deal found 11/8![Air New Zealand logo]()
$1,351
This oojo deal was found by Cheapflights users on 11/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/127:50 pm -
2 stops48h 00m
Wed 1/2711:50 am -
2 stops24h 05m
Deal found 11/8![Air New Zealand logo]()
$1,356
This oojo deal was found by Cheapflights users on 11/5. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/12:22 pm -
2 stops27h 13m
Sat 12/57:25 pm -
2 stops42h 12m
Deal found 11/5![Air New Zealand logo]()
$1,364
This oojo deal was found by Cheapflights users on 11/6. 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.
Mon 11/165:30 am -
2 stops34h 05m
Wed 11/257:25 pm -
2 stops42h 12m
Deal found 11/6![Air New Zealand logo]()
$1,365
This oojo deal was found by Cheapflights users on 11/4. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/147:55 pm -
2 stops56h 55m
Fri 11/2011:50 am -
2 stops24h 06m
Deal found 11/4![Air New Zealand logo]()
$1,369
This KAYAK deal was found by Cheapflights users on 11/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/21:57 pm -
2 stops27h 38m
Sat 1/307:25 pm -
2 stops43h 34m
Deal found 11/8![Air New Zealand logo]()
$1,370
This Trip.com deal was found by Cheapflights users on 11/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/56:21 am -
3 stops56h 14m
Sat 12/1211:10 am -
2 stops40h 14m
Deal found 11/8![Multiple Airlines logo]()
$1,377
This Expedia deal was found by Cheapflights users on 11/4. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/204:50 pm -
1 stop21h 05m
Sun 12/277:15 pm -
2 stops37h 21m
Deal found 11/4![Qantas Airways logo]()
$1,780
Best flights from Illinois to SydneyDiscover carefully curated flight deals from Illinois to Sydney that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 9, 2026.
Discover carefully curated flight deals from Illinois to Sydney that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 9, 2026.
This Qantas Airways deal was found by Cheapflights users on 11/7. 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 3/3111:04 am -
3 stops27h 26m
Tue 5/49:50 am -
3 stops28h 23m
Deal found 11/7![Multiple Airlines logo]()
$1,378
This Qatar Airways deal was found by Cheapflights users on 11/8. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/56:50 pm -
1 stop30h 30m
Mon 3/157:30 pm -
2 stops36h 00m
Deal found 11/8![Qatar Airways logo]()
$1,461
This Alaska Airlines deal was found by Cheapflights users on 11/8. 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.
Wed 1/278:00 am -
3 stops29h 25m
Wed 2/39:25 pm -
3 stops32h 48m
Deal found 11/8![Alaska Airlines logo]()
$1,529
This Qantas Airways deal was found by Cheapflights users on 11/6. 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 2/84:15 pm -
2 stops28h 00m
Fri 2/122:05 pm -
1 stop25h 24m
Deal found 11/6![Qantas Airways logo]()
$1,535
This Turkish Airlines deal was found by Cheapflights users on 11/6. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/189:15 pm -
2 stops54h 10m
Sun 3/289:50 pm -
2 stops36h 20m
Deal found 11/6![Turkish Airlines logo]()
$1,552
This United Airlines deal was found by Cheapflights users on 11/7. 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 3/313:30 pm -
2 stops24h 30m
Tue 5/49:30 am -
2 stops26h 17m
Deal found 11/7![United Airlines logo]()
$1,672
This Delta deal was found by Cheapflights users on 11/8. 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.
Tue 12/17:45 am -
1 stop31h 45m
Wed 12/910:40 am -
1 stop23h 35m
Deal found 11/8![Delta logo]()
$1,701
This Philippine Airlines deal was found by Cheapflights users on 11/8. 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 Philippine Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/188:50 pm -
2 stops45h 00m
Sun 3/2811:30 am -
2 stops34h 36m
Deal found 11/8![Multiple Airlines logo]()
$1,489
This Turkish Airlines deal was found by Cheapflights users on 11/6. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/611:45 am -
2 stops38h 40m
Thu 1/219:35 pm -
2 stops53h 25m
Deal found 11/6![Turkish Airlines logo]()
$1,752
This Delta deal was found by Cheapflights users on 11/7. 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 12/102:41 pm -
2 stops24h 49m
Tue 12/2910:40 am -
2 stops26h 38m
Deal found 11/7![Delta logo]()
$1,755
This Alaska Airlines deal was found by Cheapflights users on 11/4. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/187:20 am -
3 stops31h 05m
Sun 3/289:25 pm -
2 stops31h 39m
Deal found 11/4![Alaska Airlines logo]()
$1,758
This Expedia deal was found by Cheapflights users on 11/4. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/204:50 pm -
1 stop21h 05m
Sun 12/277:15 pm -
2 stops37h 21m
Deal found 11/4![Qantas Airways logo]()
$1,780
This Alaska Airlines deal was found by Cheapflights users on 11/8. 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.
Wed 12/237:00 am -
2 stops30h 25m
Sun 1/3111:15 am -
3 stops29h 44m
Deal found 11/8![Alaska Airlines logo]()
$1,991
This United Airlines deal was found by Cheapflights users on 11/7. 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 12/164:00 pm -
1 stop21h 20m
Mon 12/2811:50 am -
1 stop20h 00m
Deal found 11/7![United Airlines logo]()
$2,249
This Singapore Airlines deal was found by Cheapflights users on 11/6. 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 Singapore Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/141:30 pm -
3 stops38h 45m
Mon 5/103:00 pm -
3 stops41h 34m
Deal found 11/6![Multiple Airlines logo]()
$2,305
This Alaska Airlines deal was found by Cheapflights users on 11/5. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/37:40 am -
3 stops29h 45m
Sun 2/2111:15 am -
3 stops29h 44m
Deal found 11/5![Alaska Airlines logo]()
$2,141
This BusinessClass deal was found by Cheapflights users on 11/8. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1812:10 pm -
2 stops27h 50m
Sun 2/2811:20 am -
2 stops25h 44m
Deal found 11/8![Qantas Airways logo]()
$7,383
This Qantas Airways deal was found by Cheapflights users on 11/8. 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.
Thu 2/186:01 am -
3 stops31h 24m
Sun 2/287:40 pm -
3 stops33h 00m
Deal found 11/8![Multiple Airlines logo]()
$12,725
Last-minute flights from Illinois to SydneyDiscover last-minute flight deals from Illinois to Sydney. Data last updated November 9, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Sydney. Data last updated November 9, 2026 and is based on user searches.
This Philippine Airlines deal was found by Cheapflights users on 11/5. 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 Philippine Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/86:29 am -
2 stops34h 21m
Wed 11/1811:30 am -
2 stops34h 32m
Deal found 11/5![Multiple Airlines logo]()
$1,307
This oojo deal was found by Cheapflights users on 11/6. 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.
Sun 11/85:30 am -
2 stops34h 05m
Wed 11/182:05 pm -
2 stops23h 32m
Deal found 11/6![Air New Zealand logo]()
$1,346
This oojo deal was found by Cheapflights users on 11/4. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/147:55 pm -
2 stops56h 55m
Fri 11/2011:50 am -
2 stops24h 06m
Deal found 11/4![Air New Zealand logo]()
$1,369
This oojo deal was found by Cheapflights users on 11/6. 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.
Mon 11/165:30 am -
2 stops34h 05m
Wed 11/257:25 pm -
2 stops42h 12m
Deal found 11/6![Air New Zealand logo]()
$1,365
This Justfly.com deal was found by Cheapflights users on 11/8. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/12:22 pm -
2 stops25h 13m
Tue 1/2611:50 am -
2 stops25h 45m
Deal found 11/8![Air New Zealand logo]()
$1,344
This oojo deal was found by Cheapflights users on 11/5. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/12:22 pm -
2 stops27h 13m
Sat 12/57:25 pm -
2 stops42h 12m
Deal found 11/5![Air New Zealand logo]()
$1,364
This KAYAK deal was found by Cheapflights users on 11/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
2 stops34h 35m
Mon 1/252:05 pm -
2 stops23h 33m
Deal found 11/8![Air New Zealand logo]()
$1,351
This KAYAK deal was found by Cheapflights users on 11/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/21:57 pm -
2 stops27h 38m
Sat 1/307:25 pm -
2 stops43h 34m
Deal found 11/8![Air New Zealand logo]()
$1,370
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 12/49:05 pm -
1 stop40h 20m
Fri 12/117:15 pm -
2 stops38h 00m
Deal found 11/4![Qantas Airways logo]()
$1,339
This Trip.com deal was found by Cheapflights users on 11/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/56:21 am -
3 stops56h 14m
Sat 12/1211:10 am -
2 stops40h 14m
Deal found 11/8![Multiple Airlines logo]()
$1,377
This oojo deal was found by Cheapflights users on 11/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/127:50 pm -
2 stops48h 00m
Wed 1/2711:50 am -
2 stops24h 05m
Deal found 11/8![Air New Zealand logo]()
$1,356
This Expedia deal was found by Cheapflights users on 11/4. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/204:50 pm -
1 stop21h 05m
Sun 12/277:15 pm -
2 stops37h 21m
Deal found 11/4![Qantas Airways logo]()
$1,780
One-way flights from Illinois to SydneySearch for one-way flight options from Illinois to Sydney. Find affordable one-way fares based on user searches. Data last updated November 9, 2026.
Search for one-way flight options from Illinois to Sydney. Find affordable one-way fares based on user searches. Data last updated November 9, 2026.
This Trip.com deal was found by Cheapflights users on 11/4. 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 2/285:40 am -
2 stops59h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Multiple Airlines logo]()
$586
This Trip.com deal was found by Cheapflights users on 11/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/15:40 am -
2 stops45h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$608
This Kiwi.com deal was found by Cheapflights users on 11/7. 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 2/236:21 am -
3 stops58h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![Multiple Airlines logo]()
$616
This Philippine Airlines deal was found by Cheapflights users on 11/4. 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 Philippine Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/176:29 am -
2 stops35h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Multiple Airlines logo]()
$617
This Kiwi.com deal was found by Cheapflights users on 11/7. 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 2/275:40 am -
1 stop31h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![Multiple Airlines logo]()
$619
This Kiwi.com deal was found by Cheapflights users on 11/6. 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 2/136:21 am -
2 stops31h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/6![Multiple Airlines logo]()
$644
Find flight deals from Illinois to Sydney
Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated November 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,288 (Qantas Airways) |
One-way from | $586 (Trip.com) |
Popular in | December |
Cheapest in | January |
Average price | $1,483 |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Sydney 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 7,457,451 searches. Data last updated November 9, 2026.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Wed 3/17
6:29 am-9:50 am
2 stops35h 21m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$617
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Wed 3/24
7:35 am-9:50 am
2 stops34h 15m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$617
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Thu 2/25
8:50 pm-9:50 am
2 stops44h 00m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$653
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Tue 2/2
8:00 am-6:25 am
2 stops29h 25m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$655
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Fri 3/5
5:00 am-9:50 am
2 stops35h 50m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$656
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Thu 2/25
6:00 am-6:25 am
3 stops31h 25m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$719
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Mon 2/22
5:40 am-4:15 pm
2 stops41h 35m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$729
Quickest round-trip
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Wed 11/18
9:30 am-6:25 am
3 stops27h 55m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$828
ChicagoSydney
ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith
ORDSYD
Chicago O'Hare Intl
Wed 1/13
11:45 am-7:25 pm
2 stops38h 40m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$853
PeoriaSydney
PIA Greater Peoria - SYD Sydney Kingsford Smith
PIASYD
Greater Peoria
Wed 3/31
11:04 am-6:30 am
3 stops27h 26m
Sydney Kingsford Smith
Tue 5/4
9:50 am-11:13 pm
3 stops28h 23m
$1,378
Showing 1-10 of 27 resultsSorted by cheapest first
Best time to book a flight from Illinois to Sydney
Have a flexible travel schedule? Discover the best time to fly to Sydney from Illinois with our price prediction graph.
ORD-SYD
PIA-SYD
CMI-SYD
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 Illinois to Sydney
USIL-SYD
ORD-SYD
PIA-SYD
CMI-SYD
What is the cheapest month to book a flight from Illinois to Sydney?
Currently, January is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,268). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,062). 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 Illinois to Sydney?
Airfare is typical for this route at the moment.
Illinois to Sydney flights typically cost between $1,288 and $1,466 in March.The cheapest round-trip price found within the last 5 days was $1,307 on Multiple Airlines (Mar 1-Mar 18).
How far ahead should I book a flight from Illinois to Sydney?
The price you pay for your flight from Illinois to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 84 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Related info for your journey
Find useful and relevant information for your journey from Illinois to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Sydney?
Book flights to Sydney if you plan to visit one of these locationsParramatta
Wollongong
Coogee
Manly
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Alternative routes for Illinois to Sydney
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Complete your trip
Complete your trip to Sydney by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Sydney by cabin class
Find flights from Illinois to Sydney, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Sydney flights
Browse other Illinois and Sydney flight options. Last updated on November 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Sydney
Explore flights to Sydney departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on November 9, 2026.
Top 9 airlines flying from Illinois to Sydney
Discover the top 9 airlines that operate flights from Illinois to Sydney. 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 7,457,451 searches. Data last updated November 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$237 | Average$1,497 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$716 | Average$819 | FlexibilityNo cancel fee | On-time74% | |
| Cheapest$935 | Average$1,388 | FlexibilityNo cancel fee | On-time74% | |
| Cheapest$1,121 | Average$1,354 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$1,166 | Average$1,651 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$1,209 | Average$1,270 | FlexibilityNo cancel fee | On-time80% | |
| Cheapest$1,260 | Average$1,690 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$1,279 | Average$1,545 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$1,382 | Average$1,423 | FlexibilityNo cancel fee | On-time68% |