$702+ Cheap flights from St. Louis (STL) 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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Nov 25 — Dec 21
Round-trip
1 adult, Economy
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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 October 26, 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 October 26, 2026.
This Orbitz deal was found by Cheapflights users on 10/24. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/271:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
3 stops41h 50m
Deal found 10/24![Air Canada logo]()
$1,035
This Air Canada deal was found by Cheapflights users on 10/23. 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.
Sat 10/2412:10 pm -
2 stops52h 25m
Wed 11/411:20 am -
2 stops45h 06m
Deal found 10/23![Air Canada logo]()
$1,047
This Air Canada deal was found by Cheapflights users on 10/24. 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.
Tue 10/271:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
2 stops45h 03m
Deal found 10/24![Multiple Airlines logo]()
$1,048
This Air Canada deal was found by Cheapflights users on 10/21. 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.
Sat 10/2412:10 pm -
2 stops52h 25m
Sat 10/3110:20 am -
2 stops46h 03m
Deal found 10/21![Air Canada logo]()
$1,083
This Air Canada deal was found by Cheapflights users on 10/21. 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 11/184:05 pm -
2 stops48h 30m
Wed 11/2511:20 am -
2 stops45h 06m
Deal found 10/21![Air Canada logo]()
$1,088
This Air Canada deal was found by Cheapflights users on 10/23. 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 10/262:55 pm -
2 stops25h 40m
Sun 11/111:20 am -
2 stops22h 37m
Deal found 10/23![Multiple Airlines logo]()
$1,106
This Ovago deal was found by Cheapflights users on 10/24. 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.
Tue 10/271:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
1 stop45h 03m
Deal found 10/24![Air New Zealand logo]()
$1,125
This KAYAK deal was found by Cheapflights users on 10/24. 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 10/281:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
2 stops22h 37m
Deal found 10/24![Air New Zealand logo]()
$1,126
This BusinessClass deal was found by Cheapflights users on 10/24. 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.
Tue 10/271:40 pm -
2 stops26h 55m
Mon 11/911:20 am -
2 stops29h 39m
Deal found 10/24![Multiple Airlines logo]()
$1,129
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 October 26, 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 October 26, 2026.
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/182:55 pm -
1 stop23h 05m
Wed 11/259:15 am -
1 stop24h 35m
Deal found 10/21![United Airlines logo]()
$1,199
This Expedia deal was found by Cheapflights users on 10/21. 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.
Wed 11/186:50 pm -
2 stops45h 45m
Wed 11/2511:20 am -
3 stops41h 50m
Deal found 10/21![Air Canada logo]()
$1,208
This Qantas Airways deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/316:00 pm -
2 stops24h 05m
Sat 2/132:05 pm -
1 stop21h 08m
Deal found 10/24![Multiple Airlines logo]()
$1,221
This Qantas Airways deal was found by Cheapflights users on 10/23. 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.
Sat 11/72:54 pm -
1 stop23h 01m
Wed 11/119:50 pm -
2 stops39h 52m
Deal found 10/23![Qantas Airways logo]()
$1,461
This Qantas Airways deal was found by Cheapflights users on 10/21. 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.
Fri 1/292:28 pm -
2 stops22h 57m
Sat 5/159:10 am -
3 stops25h 20m
Deal found 10/21![Multiple Airlines logo]()
$1,238
This United Airlines deal was found by Cheapflights users on 10/21. 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 1/248:30 am -
1 stop31h 50m
Sat 2/611:50 am -
1 stop23h 27m
Deal found 10/21![United Airlines logo]()
$1,249
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:39 pm -
2 stops47h 41m
Sat 11/289:10 am -
1 stop30h 16m
Deal found 10/24![United Airlines logo]()
$1,276
This Air New Zealand deal was found by Cheapflights users on 10/24. 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 2/128:53 am -
3 stops30h 42m
Fri 2/199:55 am -
3 stops27h 59m
Deal found 10/24![Multiple Airlines logo]()
$1,813
This Qantas Airways deal was found by Cheapflights users on 10/24. 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 1/146:00 pm -
2 stops24h 05m
Mon 2/111:05 am -
3 stops24h 25m
Deal found 10/24![Multiple Airlines logo]()
$1,863
Last-minute flights from St. Louis to SydneyDiscover last-minute flight deals from St. Louis to Sydney. Data last updated October 26, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Sydney. Data last updated October 26, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 10/23. 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.
Sat 10/2412:10 pm -
2 stops52h 25m
Wed 11/411:20 am -
2 stops45h 06m
Deal found 10/23![Air Canada logo]()
$1,047
This Air Canada deal was found by Cheapflights users on 10/21. 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.
Sat 10/2412:10 pm -
2 stops52h 25m
Sat 10/3110:20 am -
2 stops46h 03m
Deal found 10/21![Air Canada logo]()
$1,083
This Air Canada deal was found by Cheapflights users on 10/23. 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 10/262:55 pm -
2 stops25h 40m
Sun 11/111:20 am -
2 stops22h 37m
Deal found 10/23![Multiple Airlines logo]()
$1,106
This Orbitz deal was found by Cheapflights users on 10/24. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/271:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
3 stops41h 50m
Deal found 10/24![Air Canada logo]()
$1,035
This Air Canada deal was found by Cheapflights users on 10/24. 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.
Tue 10/271:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
2 stops45h 03m
Deal found 10/24![Multiple Airlines logo]()
$1,048
This Ovago deal was found by Cheapflights users on 10/24. 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.
Tue 10/271:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
1 stop45h 03m
Deal found 10/24![Air New Zealand logo]()
$1,125
This BusinessClass deal was found by Cheapflights users on 10/24. 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.
Tue 10/271:40 pm -
2 stops26h 55m
Mon 11/911:20 am -
2 stops29h 39m
Deal found 10/24![Multiple Airlines logo]()
$1,129
This KAYAK deal was found by Cheapflights users on 10/24. 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 10/281:40 pm -
2 stops26h 55m
Tue 11/1011:20 am -
2 stops22h 37m
Deal found 10/24![Air New Zealand logo]()
$1,126
This Air Canada deal was found by Cheapflights users on 10/21. 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 11/184:05 pm -
2 stops48h 30m
Wed 11/2511:20 am -
2 stops45h 06m
Deal found 10/21![Air Canada logo]()
$1,088
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 October 26, 2026.
Search for one-way flight options from St. Louis to Sydney. Find affordable one-way fares based on user searches. Data last updated October 26, 2026.
This United Airlines deal was found by Cheapflights users on 10/25. 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 11/21:08 pm -
2 stops26h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![United Airlines logo]()
$702
This oojo deal was found by Cheapflights users on 10/25. 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 11/27:06 pm -
1 stop42h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Qantas Airways logo]()
$709
This Qantas Airways deal was found by Cheapflights users on 10/25. 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 11/28:15 pm -
3 stops41h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Multiple Airlines logo]()
$721
This oojo deal was found by Cheapflights users on 10/22. 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 3/106:00 am -
1 stop31h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Qantas Airways logo]()
$738
This Qantas Airways deal was found by Cheapflights users on 10/22. 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 3/102:27 pm -
2 stops25h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Multiple Airlines logo]()
$740
This Trip.com deal was found by Cheapflights users on 10/23. 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 1/2411:22 am -
1 stop26h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Qantas Airways logo]()
$769
This United Airlines deal was found by Cheapflights users on 10/23. 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 1/248:52 am -
2 stops28h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![United Airlines logo]()
$778
This Trip.com deal was found by Cheapflights users on 10/23. 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 1/203:45 pm -
1 stop22h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Qantas Airways logo]()
$863
This Turkish Airlines deal was found by Cheapflights users on 10/21. 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.
Sat 1/27:55 pm -
3 stops54h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Multiple Airlines logo]()
$968
This Orbitz deal was found by Cheapflights users on 10/21. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/44:32 pm -
3 stops81h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Multiple Airlines logo]()
$1,156
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 October 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,085 (Air Canada) |
One-way from | $702 (United Airlines) |
Popular in | December |
Cheapest in | March |
Average price | $1,656 |
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 7,457,451 searches. Data last updated October 26, 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 Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Mon 11/2
1:08 pm-9:05 am
2 stops26h 57m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$702
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Mon 11/2
8:15 pm-6:25 am
3 stops41h 10m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$721
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Wed 3/10
6:00 am-6:25 am
1 stop31h 25m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$738
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Wed 3/10
2:27 pm-9:00 am
2 stops25h 33m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$740
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Sun 1/24
1:17 pm-9:20 am
3 stops51h 03m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$810
Quickest round-trip
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Wed 1/20
3:45 pm-6:55 am
1 stop22h 10m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$863
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Sat 1/2
7:55 pm-7:25 pm
3 stops54h 30m
Sydney Kingsford Smith
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$968
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Wed 11/18
2:55 pm-7:00 am
1 stop23h 05m
Sydney Kingsford Smith
Wed 11/25
9:15 am-4:50 pm
1 stop24h 35m
$1,199
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Wed 11/18
6:50 pm-9:35 am
2 stops45h 45m
Sydney Kingsford Smith
Wed 11/25
11:20 am-12:10 pm
3 stops41h 50m
$1,208
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Sun 1/31
6:00 pm-11:05 am
2 stops24h 05m
Sydney Kingsford Smith
Sat 2/13
2:05 pm-6:13 pm
1 stop21h 08m
$1,221
Showing 1-10 of 21 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 October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 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, March is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,219). Flying from St. Louis to Sydney in December is currently the most expensive (average of $1,975). 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?
Airfare is below average for this route at the moment.
St. Louis to Sydney flights typically cost between $1,401 and $1,778 in January.The cheapest round-trip price found within the last 5 days was $1,085 on Multiple Airlines (Jan 31-Feb 13).
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 October 26, 2026.
Get a feel of what it's like to fly with Qantas Airways,United Airlines, andAmerican 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
8.1
Boarding
7.7
Comfort
7.4
Entertainment
7.2
Food
7.0
Overall
7.5
Reviews
1 / 20
4.0
OkayRobyn,Aug 2026
LAX - SYD
Crew
8.1
Boarding
7.7
Comfort
7.4
Entertainment
7.2
Food
7.0
Overall
7.5
Reviews
1 / 20
4.0
OkayRobyn,Aug 2026
LAX - SYD
Crew
8.1
Boarding
7.7
Comfort
7.4
Entertainment
7.2
Food
7.0
Overall
7.5
Reviews
1 / 20
4.0
OkayRobyn,Aug 2026
LAX - SYD
Crew
8.1
Boarding
7.7
Comfort
7.4
Entertainment
7.2
Food
7.0
Overall
7.5
Reviews
1 / 20
4.0
OkayRobyn,Aug 2026
LAX - SYD
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
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St. Louis and Sydney flights
Browse other St. Louis and Sydney flight options. Last updated on October 26, 2026.
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Top 3 airlines flying from St. Louis to Sydney
Discover the top 3 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 7,457,451 searches. Data last updated October 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$1,102 | Average$1,360 | FlexibilityNo cancel fee | On-time74% | |
| Cheapest$1,161 | Average$1,407 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$1,233 | Average$1,605 | FlexibilityNo cancel fee | On-time71% |