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$866+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Jun 11 — Jun 181
Thu 6/11
Thu 6/18
1 adult, Economy
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Cheap flight deals from St. Louis to Sydney

Cheapest flights from St. Louis to Sydney
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 May 12, 2026.

This oojo deal was found by Cheapflights users on 5/7. 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.
Sat 11/77:00 am
STL
-
SYD
1 stop33h 00m
Qantas Airways
Thu 11/197:15 pm
SYD
-
STL
2 stops34h 22m
Qantas Airways
Deal found 5/7$1,021
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.
Wed 7/227:23 pm
STL
-
SYD
1 stop20h 32m
Air New Zealand
Wed 7/2910:20 am
SYD
-
STL
1 stop22h 57m
Air New Zealand
Deal found 5/12$1,160
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:23 pm
STL
-
SYD
1 stop20h 32m
United Airlines
Sun 8/210:20 am
SYD
-
STL
1 stop22h 57m
United Airlines
Deal found 5/11$1,161
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:30 am
STL
-
SYD
1 stop33h 35m
Qantas Airways
Mon 10/265:50 pm
SYD
-
STL
2 stops38h 52m
Qantas Airways
Deal found 5/11$1,164
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.
Sun 6/71:38 pm
STL
-
SYD
2 stops26h 22m
Air New Zealand
Sun 6/1410:20 am
SYD
-
STL
1 stop22h 57m
Air New Zealand
Deal found 5/11$1,165
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/219:15 am
STL
-
SYD
2 stops30h 45m
United Airlines
Wed 9/29:30 am
SYD
-
STL
2 stops26h 08m
United Airlines
Deal found 5/11$1,166
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/225:10 am
STL
-
SYD
2 stops34h 50m
United Airlines
Wed 7/2910:20 am
SYD
-
STL
2 stops26h 06m
United Airlines
Deal found 5/11$1,180
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.
Wed 7/227:23 pm
STL
-
SYD
1 stop20h 32m
Air New Zealand
Fri 7/3110:20 am
SYD
-
STL
1 stop22h 57m
Air New Zealand
Deal found 5/11$1,210
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:23 pm
STL
-
SYD
1 stop20h 32m
United Airlines
Fri 7/3110:20 am
SYD
-
STL
1 stop22h 57m
United Airlines
Deal found 5/11$1,211
This Justfly.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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/177:05 am
STL
-
SYD
2 stops33h 15m
Air Canada
Sun 5/249:20 am
SYD
-
STL
2 stops22h 13m
Air Canada
Deal found 5/10$1,213
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/216:00 am
STL
-
SYD
2 stops34h 00m
United Airlines
Thu 8/2710:20 am
SYD
-
STL
2 stops21h 14m
United Airlines
Deal found 5/11$1,216

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 May 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,021
(oojo)

One-way from

$866
(Trip.com)

Popular in

December

Cheapest in

March

Average price

$1,341
Provider with most accurate pricing for Lambert-St Louis-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Sydney Kingsford Smith flights.
Search Deals
From Lambert-St Louis to Sydney Kingsford Smith
Search Deals
One-way flight from Lambert-St Louis to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 May 12, 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

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 7/22

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Fri 8/28

10:20 am-6:39 pm

1 stop23h 19m

$1,211

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 7/22

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Thu 8/27

10:20 am-4:34 pm

2 stops21h 14m

$1,216

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/1

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Fri 8/14

10:20 am-6:39 pm

1 stop23h 19m

$1,261

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 6/13

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sat 6/27

9:30 am-6:13 pm

2 stops23h 43m

$1,266

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/25

6:37 am-10:45 am

2 stops37h 08m

Sydney Kingsford Smith

Mon 8/31

5:50 pm-10:55 pm

1 stop20h 05m

$1,567
Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 7/5

7:21 pm-6:55 am

1 stop20h 34m

Sydney Kingsford Smith

Sun 9/6

5:50 pm-10:55 pm

1 stop20h 05m

$1,608

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/20

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Tue 9/1

10:20 am-3:38 pm

2 stops44h 18m

$1,656

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 6/13

6:35 am-7:05 am

1 stop33h 30m

Sydney Kingsford Smith

Sat 6/27

9:10 am-11:56 pm

1 stop29h 46m

$1,664

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 7/5

10:20 am-7:00 am

2 stops29h 40m

Sydney Kingsford Smith

Sun 9/6

9:30 am-10:27 pm

2 stops27h 57m

$1,691

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 7/23

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Tue 9/1

10:20 am-3:38 pm

2 stops44h 18m

$1,706

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/10

Showing 1-10 of 13 resultsSorted by cheapest first
1
2

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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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 $1,233). Flying from St. Louis to Sydney in December is currently the most expensive (average of $1,666). 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 May 12, 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.
Fiji Airways
8.1
Very good
241 reviews

Comfort

8.1

Overall

8.1

Crew

8.6

Food

7.6

Entertainment

7.5

Boarding

8.2

Reviews

1 / 19
8.0
Excellent

Paul,Mar 2026

YVR - NAN

Flown with Fiji Airways before they have always been good. The crew are very friendly and attentive. The seats in economy are in the small side but good. Another happy flight with them.
Fiji Airways
8.1
Very good
241 reviews
Fiji Airways
8.1
Very good
241 reviews

Comfort

8.1

Overall

8.1

Crew

8.6

Food

7.6

Entertainment

7.5

Boarding

8.2

Reviews

1 / 19
8.0
Excellent

Paul,Mar 2026

YVR - NAN

Flown with Fiji Airways before they have always been good. The crew are very friendly and attentive. The seats in economy are in the small side but good. Another happy flight with them.
Qantas Airways
7.5
Good
1,037 reviews
Fiji Airways
8.1
Very good
241 reviews

Comfort

8.1

Overall

8.1

Crew

8.6

Food

7.6

Entertainment

7.5

Boarding

8.2

Reviews

1 / 19
8.0
Excellent

Paul,Mar 2026

YVR - NAN

Flown with Fiji Airways before they have always been good. The crew are very friendly and attentive. The seats in economy are in the small side but good. Another happy flight with them.
United Airlines
7.4
Good
9,704 reviews
Fiji Airways
8.1
Very good
241 reviews

Comfort

8.1

Overall

8.1

Crew

8.6

Food

7.6

Entertainment

7.5

Boarding

8.2

Reviews

1 / 19
8.0
Excellent

Paul,Mar 2026

YVR - NAN

Flown with Fiji Airways before they have always been good. The crew are very friendly and attentive. The seats in economy are in the small side but good. Another happy flight with them.
American Airlines
7.1
Good
11,665 reviews
Fiji Airways
8.1
Very good
241 reviews

Comfort

8.1

Overall

8.1

Crew

8.6

Food

7.6

Entertainment

7.5

Boarding

8.2

Reviews

1 / 19
8.0
Excellent

Paul,Mar 2026

YVR - NAN

Flown with Fiji Airways before they have always been good. The crew are very friendly and attentive. The seats in economy are in the small side but good. Another happy flight with them.

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.

  • How long is the flight from St. Louis to Sydney?

    There are many flights that can get you from St. Louis to Sydney in 20h 32m. Fly via United Airlines to get the fastest option. The distance between St. Louis and Sydney is about 9054 mi.

  • What are the cheapest airlines flying from St. Louis to Sydney round-trip?

    According to our current data, Fiji Airways ($887), United Airlines ($1,079), and Qantas Airways ($1,145) offers the cheapest pricing from St. Louis to Sydney. Fiji Airways is priced at 35% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from St. Louis to Sydney that include hotel bookings?

    Yes. In addition to deals on St. Louis to Sydney flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Sydney.

  • Can I find deals for business class flights from St. Louis to Sydney?

    Yes. Cheapflights offers flight deals from St. Louis to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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 $1,233). Flying from St. Louis to Sydney in December is currently the most expensive (average of $1,666). 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.

See more FAQs

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Coogee
Manly

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Sydney flights

Top 4 airlines flying from St. Louis to Sydney

Discover the top 4 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 May 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
Fiji AirwaysCheapest$887Average$1,214FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,079Average$1,511FlexibilityNo cancel feeOn-time69%
Qantas AirwaysCheapest$1,145Average$1,354FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$1,233Average$1,497FlexibilityNo cancel feeOn-time71%

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