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St. Louis

$629+ Cheap flights from Sydney (SYD) to St. Louis (STL)

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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
Jun 19 — Jun 261
Fri 6/19
Fri 6/26
1 adult, Economy
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Cheap flight deals from Sydney to St. Louis

Cheapest flights from Sydney to St. Louis
Explore the most affordable flight options available from Sydney to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 20, 2026.

This Bravofly deal was found by Cheapflights users on 5/20. 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:10 am
SYD
-
STL
1 stop29h 46m
Qantas Airways
Sun 6/76:35 am
STL
-
SYD
1 stop33h 30m
Qantas Airways
Deal found 5/20$1,006
This American Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:10 am
SYD
-
STL
2 stops22h 20m
American Airlines
Sun 6/76:35 am
STL
-
SYD
1 stop33h 30m
American Airlines
Deal found 5/20$1,009
This lol.travel deal was found by Cheapflights users on 5/16. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/189:10 am
SYD
-
STL
1 stop29h 49m
Qantas Airways
Mon 5/256:35 am
STL
-
SYD
1 stop33h 30m
Qantas Airways
Deal found 5/16$1,014
This American Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/189:10 am
SYD
-
STL
2 stops25h 20m
American Airlines
Mon 5/259:41 am
STL
-
SYD
2 stops30h 24m
American Airlines
Deal found 5/16$1,019
This United Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1710:20 am
SYD
-
STL
1 stop22h 57m
United Airlines
Wed 6/241:13 pm
STL
-
SYD
2 stops26h 47m
United Airlines
Deal found 5/17$1,031
This Expedia deal was found by Cheapflights users on 5/16. 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.
Thu 6/119:20 am
SYD
-
STL
2 stops22h 13m
Air Canada
Wed 6/174:48 pm
STL
-
SYD
2 stops23h 32m
Air Canada
Deal found 5/16$1,036
This United Airlines deal was found by Cheapflights users on 5/16. 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 5/1810:20 am
SYD
-
STL
1 stop23h 02m
United Airlines
Mon 5/2510:25 am
STL
-
SYD
2 stops29h 35m
United Airlines
Deal found 5/16$1,038
This American Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/39:10 am
SYD
-
STL
2 stops43h 42m
American Airlines
Sun 6/77:04 am
STL
-
SYD
1 stop32h 51m
American Airlines
Deal found 5/17$1,045
This Bravofly deal was found by Cheapflights users on 5/20. 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/49:10 am
SYD
-
STL
1 stop29h 46m
Qantas Airways
Sat 6/136:35 am
STL
-
SYD
1 stop33h 30m
Qantas Airways
Deal found 5/20$1,054
This American Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2012:00 pm
SYD
-
STL
1 stop20h 21m
American Airlines
Thu 5/286:35 am
STL
-
SYD
1 stop33h 30m
American Airlines
Deal found 5/19$1,055
This Aunt Betty deal was found by Cheapflights users on 5/16. 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 Aunt Betty is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1212:00 pm
SYD
-
STL
1 stop19h 41m
Qantas Airways
Sat 9/55:11 pm
STL
-
SYD
1 stop22h 44m
Qantas Airways
Deal found 5/16$1,059

Find flight deals from Sydney to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Sydney (SYD) to St. Louis (STL). 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 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,031
(United Airlines)

One-way from

$629
(American Airlines)

Popular in

July

Cheapest in

September

Average price

$1,151
Provider with most accurate pricing for Sydney Kingsford Smith-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sydney Kingsford Smith-Lambert-St Louis flights.
Search Deals
From Sydney Kingsford Smith to Lambert-St Louis
Search Deals
One-way flight from Sydney Kingsford Smith to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($144 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($43 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 Sydney to St. Louis 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 20, 2026.
Use the filters below to find and compare flights from Sydney to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/12

10:20 am-6:39 pm

1 stop23h 19m

Lambert-St Louis

Sat 9/5

3:13 pm-7:00 am

2 stops24h 47m

$1,081

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/2

10:20 am-8:34 am

2 stops37h 14m

Lambert-St Louis

Thu 7/9

2:57 pm-7:00 am

2 stops25h 03m

$1,082

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/11

9:20 am-8:25 pm

3 stops50h 05m

Lambert-St Louis

Wed 6/17

1:05 pm-7:20 am

3 stops51h 15m

$1,114

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 6/3

9:20 am-9:10 pm

2 stops26h 50m

Lambert-St Louis

Sun 6/7

8:40 am-7:20 am

2 stops31h 40m

$1,208

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 7/8

10:20 am-6:17 pm

1 stop22h 57m

Lambert-St Louis

Mon 7/20

7:23 pm-6:55 am

1 stop20h 32m

$1,320

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 9/19

9:15 am-11:37 pm

2 stops29h 22m

Lambert-St Louis

Sun 9/27

2:15 pm-6:50 am

2 stops25h 35m

$1,323

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/2

10:20 am-12:11 pm

2 stops40h 51m

Lambert-St Louis

Sat 7/11

7:23 pm-6:55 am

1 stop20h 32m

$1,365

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 7/1

10:20 am-6:17 pm

1 stop22h 57m

Lambert-St Louis

Wed 7/8

7:23 pm-6:55 am

1 stop20h 32m

$1,413
Quickest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/2

5:50 pm-11:59 pm

1 stop21h 09m

Lambert-St Louis

Sat 7/11

7:23 pm-6:55 am

1 stop20h 32m

$1,966

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 6/3

10:20 am-6:17 pm

1 stop22h 57m

Lambert-St Louis

Sun 6/7

7:23 pm-6:55 am

1 stop20h 32m

$2,069

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/16

Showing 1-10 of 15 resultsSorted by cheapest first
1
2
  • Most accurate provider: When it comes to deals on Sydney-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Sydney-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Sydney-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Sydney-St. Louis 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 Sydney-St. Louis 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 Sydney to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Sydney 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 Sydney to St. Louis

What is the cheapest month to book a flight from Sydney to St. Louis?

Currently, September is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $948). Flying from Sydney to St. Louis in July is currently the most expensive (average of $1,789). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Sydney to St. Louis?

Related info for your journey

Find useful and relevant information for your journey from Sydney to St. Louis. 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 Sydney to St. Louis?

    There are many flights that can get you from Sydney to St. Louis in 27h. Fly via United Airlines or Air Canada to get the fastest option. There are 9054 mi between Sydney and St. Louis. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sydney to St. Louis 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 Sydney to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $948). Flying from Sydney to St. Louis in July is currently the most expensive (average of $1,789). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

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