$506+ Cheap flights from St. Louis (STL) to Sydney (SYD)
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 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Apr 10 — Apr 171
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from St. Louis 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 St. Louis to Sydney
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to SydneyExplore the most affordable flight options available from St. Louis to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 11, 2026.
Explore the most affordable flight options available from St. Louis to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 11, 2026.
This lastminute.com deal was found by Cheapflights users on 3/6. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:21 am
STL
- SYD
2 stops35h 59m
Qantas Airways
Mon 4/2712:00 pm
SYD
- STL
1 stop20h 21m
Qantas Airways
Deal found 3/6![Qantas Airways logo]()
$1,128
This oojo deal was found by Cheapflights users on 3/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/93:59 pm
STL
- SYD
1 stop21h 56m
Qantas Airways
Tue 12/157:00 am
SYD
- STL
2 stops22h 32m
Qantas Airways
Deal found 3/7![Qantas Airways logo]()
$1,143
This oojo deal was found by Cheapflights users on 3/6. 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 4/196:21 am
STL
- SYD
2 stops37h 34m
Qantas Airways
Sat 4/2512:00 pm
SYD
- STL
1 stop22h 30m
Qantas Airways
Deal found 3/6![Qantas Airways logo]()
$1,146
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/207:05 pm
STL
- SYD
1 stop20h 50m
United Airlines
Mon 4/2710:20 am
SYD
- STL
1 stop23h 04m
United Airlines
Deal found 3/6![United Airlines logo]()
$1,194
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/74:40 pm
STL
- SYD
2 stops23h 15m
United Airlines
Mon 9/1410:20 am
SYD
- STL
1 stop23h 04m
United Airlines
Deal found 3/6![United Airlines logo]()
$1,199
This Qantas Airways deal was found by Cheapflights users on 3/6. 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.
Thu 4/306:21 am
STL
- SYD
2 stops35h 59m
Qantas Airways
Mon 5/412:00 pm
SYD
- STL
1 stop20h 21m
Qantas Airways
Deal found 3/6![Qantas Airways logo]()
$1,200
This oojo deal was found by Cheapflights users on 3/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/204:17 pm
STL
- SYD
2 stops24h 28m
Air New Zealand
Wed 11/49:55 am
SYD
- STL
2 stops25h 43m
Air New Zealand
Deal found 3/9![Air New Zealand logo]()
$1,216
This oojo deal was found by Cheapflights users on 3/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:00 am
STL
- SYD
2 stops35h 45m
Air New Zealand
Mon 5/189:55 am
SYD
- STL
2 stops34h 52m
Air New Zealand
Deal found 3/9![Air New Zealand logo]()
$1,222
This Justfly.com deal was found by Cheapflights users on 3/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/194:17 pm
STL
- SYD
2 stops26h 23m
Air New Zealand
Wed 11/49:55 am
SYD
- STL
2 stops25h 43m
Air New Zealand
Deal found 3/9![Air New Zealand logo]()
$1,227
This oojo deal was found by Cheapflights users on 3/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:00 am
STL
- SYD
2 stops35h 45m
Air New Zealand
Thu 4/309:55 am
SYD
- STL
2 stops38h 35m
Air New Zealand
Deal found 3/11![Air New Zealand logo]()
$1,230
This oojo deal was found by Cheapflights users on 3/6. 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 4/1910:09 am
STL
- SYD
2 stops31h 36m
Air New Zealand
Sat 4/257:20 pm
SYD
- STL
2 stops42h 08m
Air New Zealand
Deal found 3/6![Air New Zealand logo]()
$1,234
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/72:35 pm
STL
- SYD
2 stops25h 20m
United Airlines
Tue 5/1210:20 am
SYD
- STL
1 stop23h 02m
United Airlines
Deal found 3/6![United Airlines logo]()
$1,235
Best flights from St. Louis to SydneyDiscover carefully curated flight deals from St. Louis to Sydney that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
Discover carefully curated flight deals from St. Louis to Sydney that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
This Delta deal was found by Cheapflights users on 3/7. 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.
Mon 5/41:46 pm
STL
- SYD
2 stops26h 04m
Delta
Mon 5/189:15 am
SYD
- STL
2 stops26h 54m
Delta
Deal found 3/7![Delta logo]()
$1,199
This Qantas Airways deal was found by Cheapflights users on 3/6. 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.
Thu 4/306:21 am
STL
- SYD
2 stops35h 59m
Qantas Airways
Mon 5/412:00 pm
SYD
- STL
1 stop20h 21m
Qantas Airways
Deal found 3/6![Qantas Airways logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/238:52 am
STL
- SYD
1 stop31h 03m
United Airlines
Sat 8/2910:20 am
SYD
- STL
1 stop23h 04m
United Airlines
Deal found 3/6![United Airlines logo]()
$1,235
This Air New Zealand deal was found by Cheapflights users on 3/8. 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 Air New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:45 am
STL
- SYD
3 stops34h 00m
Multiple Airlines
Mon 5/189:55 am
SYD
- STL
2 stops27h 35m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$1,319
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/72:35 pm
STL
- SYD
2 stops25h 25m
United Airlines
Tue 5/129:30 am
SYD
- STL
2 stops25h 21m
United Airlines
Deal found 3/6![United Airlines logo]()
$1,240
This Air New Zealand deal was found by Cheapflights users on 3/7. 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 Air New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/207:45 am
STL
- SYD
3 stops34h 00m
Multiple Airlines
Wed 6/1011:55 am
SYD
- STL
3 stops27h 02m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$1,374
This Qantas Airways deal was found by Cheapflights users on 3/10. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/186:21 am
STL
- SYD
1 stop33h 44m
Qantas Airways
Tue 8/119:10 am
SYD
- STL
1 stop28h 58m
Qantas Airways
Deal found 3/10![Qantas Airways logo]()
$1,494
This Air New Zealand deal was found by Cheapflights users on 3/9. 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 New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:10 am
STL
- SYD
3 stops32h 35m
Multiple Airlines
Fri 5/111:55 am
SYD
- STL
2 stops25h 35m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$1,414
This United Airlines deal was found by Cheapflights users on 3/10. 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.
Sun 5/177:06 pm
STL
- SYD
1 stop20h 49m
United Airlines
Thu 8/1310:20 am
SYD
- STL
2 stops44h 18m
United Airlines
Deal found 3/10![United Airlines logo]()
$1,619
This Air New Zealand deal was found by Cheapflights users on 3/7. 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 Air New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/271:13 pm
STL
- SYD
3 stops30h 27m
Multiple Airlines
Wed 6/1011:55 am
SYD
- STL
3 stops27h 02m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$1,520
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:30 am
STL
- SYD
1 stop31h 25m
United Airlines
Thu 4/3010:20 am
SYD
- STL
1 stop23h 02m
United Airlines
Deal found 3/9![United Airlines logo]()
$1,808
Last-minute flights from St. Louis to SydneyDiscover last-minute flight deals from St. Louis to Sydney. Data last updated March 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Sydney. Data last updated March 11, 2026 and is based on user searches.
This oojo deal was found by Cheapflights users on 3/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:00 am
STL
- SYD
2 stops35h 45m
Air New Zealand
Tue 4/287:20 pm
SYD
- STL
2 stops42h 08m
Air New Zealand
Deal found 3/7![Air New Zealand logo]()
$1,242
This oojo deal was found by Cheapflights users on 3/6. 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 4/196:21 am
STL
- SYD
2 stops37h 34m
Qantas Airways
Sat 4/2512:00 pm
SYD
- STL
1 stop22h 30m
Qantas Airways
Deal found 3/6![Qantas Airways logo]()
$1,146
This oojo deal was found by Cheapflights users on 3/6. 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 4/1910:09 am
STL
- SYD
2 stops31h 36m
Air New Zealand
Sat 4/257:20 pm
SYD
- STL
2 stops42h 08m
Air New Zealand
Deal found 3/6![Air New Zealand logo]()
$1,234
This lastminute.com deal was found by Cheapflights users on 3/6. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:21 am
STL
- SYD
2 stops35h 59m
Qantas Airways
Mon 4/2712:00 pm
SYD
- STL
1 stop20h 21m
Qantas Airways
Deal found 3/6![Qantas Airways logo]()
$1,128
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/207:05 pm
STL
- SYD
1 stop20h 50m
United Airlines
Mon 4/2710:20 am
SYD
- STL
1 stop23h 04m
United Airlines
Deal found 3/6![United Airlines logo]()
$1,194
This lastminute.com deal was found by Cheapflights users on 3/6. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:00 am
STL
- SYD
2 stops35h 45m
Air New Zealand
Mon 4/279:55 am
SYD
- STL
2 stops38h 30m
Air New Zealand
Deal found 3/6![Air New Zealand logo]()
$1,222
This oojo deal was found by Cheapflights users on 3/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:00 am
STL
- SYD
2 stops35h 45m
Air New Zealand
Thu 4/309:55 am
SYD
- STL
2 stops38h 35m
Air New Zealand
Deal found 3/11![Air New Zealand logo]()
$1,230
This Qantas Airways deal was found by Cheapflights users on 3/6. 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.
Thu 4/306:21 am
STL
- SYD
2 stops35h 59m
Qantas Airways
Mon 5/412:00 pm
SYD
- STL
1 stop20h 21m
Qantas Airways
Deal found 3/6![Qantas Airways logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:06 pm
STL
- SYD
1 stop20h 49m
United Airlines
Mon 5/410:20 am
SYD
- STL
1 stop23h 02m
United Airlines
Deal found 3/6![United Airlines logo]()
$1,235
One-way flights from St. Louis to SydneySearch for one-way flight options from St. Louis to Sydney. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
Search for one-way flight options from St. Louis to Sydney. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/7. 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.
Thu 6/1110:55 am
STL
- SYD
2 stops33h 55m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$506
This Kiwi.com deal was found by Cheapflights users on 3/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/3110:55 am
STL
- SYD
3 stops33h 55m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$528
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1710:55 am
STL
- SYD
3 stops33h 55m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$530
This Kiwi.com deal was found by Cheapflights users on 3/7. 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.
Mon 6/88:08 pm
STL
- SYD
3 stops48h 42m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$562
This Kiwi.com deal was found by Cheapflights users on 3/7. 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.
Wed 6/108:08 pm
STL
- SYD
3 stops48h 42m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$587
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 6/96:40 pm
STL
- SYD
3 stops50h 25m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$594
This Kiwi.com deal was found by Cheapflights users on 3/7. 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.
Fri 6/123:48 pm
STL
- SYD
3 stops53h 02m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$603
This Kiwi.com deal was found by Cheapflights users on 3/7. 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.
Sun 6/75:33 pm
STL
- SYD
3 stops51h 32m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$613
This Air Canada deal was found by Cheapflights users on 3/9. 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.
Sun 5/317:05 am
STL
- SYD
2 stops33h 15m
Air Canada
Deal found 3/9![Air Canada logo]()
$632
Find flight deals from St. Louis to Sydney
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,128 (lastminute.com) |
One-way from | $506 (Kiwi.com) |
Popular in | December |
Cheapest in | March |
Average price | $1,254 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis 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 2,558,603 searches. Data last updated March 11, 2026.
Use the filters below to find and compare flights from St. Louis to Sydney that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Mon 5/4
1:46 pm-6:50 am
2 stops26h 04m
Sydney Kingsford Smith
Mon 5/18
9:15 am-9:09 pm
2 stops26h 54m
$1,199
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Thu 4/30
6:21 am-9:20 am
2 stops35h 59m
Sydney Kingsford Smith
Mon 5/4
12:00 pm-5:21 pm
1 stop20h 21m
$1,200
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Sun 8/23
8:52 am-6:55 am
1 stop31h 03m
Sydney Kingsford Smith
Sat 8/29
10:20 am-6:24 pm
1 stop23h 04m
$1,235
Quickest round-trip
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Thu 5/7
2:35 pm-7:00 am
2 stops25h 25m
Sydney Kingsford Smith
Tue 5/12
9:30 am-7:51 pm
2 stops25h 21m
$1,240
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Mon 5/4
7:45 am-8:45 am
3 stops34h 00m
Sydney Kingsford Smith
Mon 5/18
9:55 am-10:30 pm
2 stops27h 35m
$1,319
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Wed 5/20
7:45 am-8:45 am
3 stops34h 00m
Sydney Kingsford Smith
Wed 6/10
11:55 am-11:57 pm
3 stops27h 02m
$1,374
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Fri 4/24
9:10 am-8:45 am
3 stops32h 35m
Sydney Kingsford Smith
Fri 5/1
11:55 am-10:30 pm
2 stops25h 35m
$1,414
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Mon 5/18
6:21 am-7:05 am
1 stop33h 44m
Sydney Kingsford Smith
Tue 8/11
9:10 am-11:08 pm
1 stop28h 58m
$1,494
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Wed 5/27
1:13 pm-10:40 am
3 stops30h 27m
Sydney Kingsford Smith
Wed 6/10
11:55 am-11:57 pm
3 stops27h 02m
$1,520
St. LouisSydney
STL - SYD
STLSYD
Lambert-St Louis
Sun 5/17
7:06 pm-6:55 am
1 stop20h 49m
Sydney Kingsford Smith
Thu 8/13
10:20 am-3:38 pm
2 stops44h 18m
$1,619
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Sydney
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Sydney in March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Sydney flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Sydney flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Sydney flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Sydney flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Sydney
Have a flexible travel schedule? Discover the best time to fly to Sydney from St. Louis with our price prediction graph.
STL-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 St. Louis to Sydney
What is the cheapest month to book a flight from St. Louis to Sydney?
Currently, August is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $649). Flying from St. Louis to Sydney in June is currently the most expensive (average of $1,281). 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 St. Louis to Sydney?
Reviews of airlines servicing Sydney
Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated March 11, 2026.
Get a feel of what it's like to fly with Fiji Airways,Qantas Airways, andUnited Airlines from St. Louis to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Food
7.5
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 18
10.0
ExcellentAnonymous,Feb 2026
SFO - NAN
Crew
8.5
Food
7.5
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 18
10.0
ExcellentAnonymous,Feb 2026
SFO - NAN
Crew
8.5
Food
7.5
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 18
10.0
ExcellentAnonymous,Feb 2026
SFO - NAN
Crew
8.5
Food
7.5
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 18
10.0
ExcellentAnonymous,Feb 2026
SFO - NAN
Crew
8.5
Food
7.5
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 18
10.0
ExcellentAnonymous,Feb 2026
SFO - NAN
Crew
8.5
Food
7.5
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 18
10.0
ExcellentAnonymous,Feb 2026
SFO - NAN
Related info for your journey
Find useful and relevant information for your journey from St. Louis 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
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from St. Louis
Popular flights
Sydney flight routes
Alternative routes for St. Louis to Sydney
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Sydney by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Sydney by cabin class
Find flights from St. Louis to Sydney, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Sydney flights
Browse other St. Louis and Sydney flight options. Last updated on March 11, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on March 11, 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 March 11, 2026.
Top 5 airlines flying from St. Louis to Sydney
Discover the top 5 airlines that operate flights from St. Louis 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 2,558,603 searches. Data last updated March 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$608 | Average$1,250 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$1,132 | Average$1,222 | FlexibilityNo cancel fee | On-time74% | |
| Cheapest$1,144 | Average$1,511 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$1,145 | Average$1,358 | FlexibilityNo cancel fee | On-time74% | |
| Cheapest$1,233 | Average$1,497 | FlexibilityNo cancel fee | On-time71% |