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St. Louis

$616+ 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 3/18. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
Mar 21 — Mar 281
Sat 3/21
Sat 3/28
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 February 19, 2026.

This Booking.com deal was found by Cheapflights users on 2/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:20 am
SYD
-
STL
2 stops43h 42m
Air Canada
Wed 9/238:55 am
STL
-
SYD
2 stops55h 25m
Air Canada
Deal found 2/16$989
This Gotogate deal was found by Cheapflights users on 2/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/19:20 am
SYD
-
STL
2 stops49h 44m
Air Canada
Sun 5/242:20 pm
STL
-
SYD
2 stops50h 00m
Air Canada
Deal found 2/14$1,010
This Booking.com deal was found by Cheapflights users on 2/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/69:20 am
SYD
-
STL
2 stops43h 42m
Air Canada
Sat 8/298:55 am
STL
-
SYD
2 stops55h 25m
Air Canada
Deal found 2/17$1,024
This American Airlines deal was found by Cheapflights users on 2/17. 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 3/1811:20 am
SYD
-
STL
1 stop28h 38m
American Airlines
Wed 3/254:13 pm
STL
-
SYD
2 stops24h 47m
American Airlines
Deal found 2/17$1,044
This American Airlines deal was found by Cheapflights users on 2/17. 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.
Thu 3/1211:20 am
SYD
-
STL
1 stop28h 38m
American Airlines
Mon 3/162:31 pm
STL
-
SYD
2 stops26h 29m
American Airlines
Deal found 2/17$1,058
This American Airlines deal was found by Cheapflights users on 2/14. 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 2/1911:20 am
SYD
-
STL
2 stops28h 38m
American Airlines
Mon 2/238:00 am
STL
-
SYD
2 stops32h 00m
American Airlines
Deal found 2/14$1,060
This Delta deal was found by Cheapflights users on 2/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/189:40 am
SYD
-
STL
2 stops23h 25m
Delta
Wed 3/257:03 am
STL
-
SYD
2 stops32h 22m
Delta
Deal found 2/17$1,063
This United Airlines deal was found by Cheapflights users on 2/16. 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 6/2910:20 am
SYD
-
STL
1 stop22h 33m
United Airlines
Wed 7/227:06 pm
STL
-
SYD
1 stop20h 49m
United Airlines
Deal found 2/16$1,064
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Thu 8/610:20 am
SYD
-
STL
1 stop22h 33m
United Airlines
Sat 8/296:49 pm
STL
-
SYD
2 stops45h 06m
United Airlines
Deal found 2/17$1,065

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 February 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,011
(Gotogate)

One-way from

$616
(Bravofly)

Popular in

July

Cheapest in

August

Average price

$1,249
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. 3% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 19, 2026.
Use the filters below to find and compare flights from Sydney to St. Louis that are best for you.

Fly from

Sydney

Fly to

St. Louis

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 8/6

9:20 am-2:02 pm

2 stops43h 42m

Lambert-St Louis

Sat 8/29

8:55 am-7:20 am

2 stops55h 25m

$1,026

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 3/18

11:20 am-11:58 pm

1 stop28h 38m

Lambert-St Louis

Wed 3/25

6:38 am-9:00 am

1 stop34h 22m

$1,044

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

11:20 am-11:58 pm

1 stop28h 38m

Lambert-St Louis

Mon 3/16

2:31 pm-9:00 am

2 stops26h 29m

$1,058

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 3/18

9:40 am-5:05 pm

2 stops23h 25m

Lambert-St Louis

Wed 3/25

7:03 am-7:25 am

2 stops32h 22m

$1,063

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 8/6

10:20 am-5:53 pm

1 stop22h 33m

Lambert-St Louis

Sat 8/29

6:49 pm-6:55 am

2 stops45h 06m

$1,063

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 6/29

10:20 am-5:53 pm

1 stop22h 33m

Lambert-St Louis

Wed 7/22

7:06 pm-6:55 am

1 stop20h 49m

$1,064

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

11:50 am-10:16 pm

1 stop26h 26m

Lambert-St Louis

Mon 3/16

4:47 pm-7:00 am

1 stop22h 13m

$1,077

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 3/18

5:00 pm-11:58 pm

2 stops22h 58m

$616

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 3/18

11:20 am-11:58 pm

1 stop28h 38m

$690

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 3/21

1:15 pm-9:01 am

2 stops35h 46m

$732

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/17

Showing 1-10 of 13 results
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, November is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $834). Flying from Sydney to St. Louis in December is currently the most expensive (average of $1,262). 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.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated February 19, 2026.
Read reviews from past customers who have flown Qantas Airways from Sydney to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
992 reviews

Crew

8.1

Boarding

7.7

Comfort

7.5

Food

7.0

Overall

7.5

Entertainment

7.2

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Qantas Airways
7.5
Good
992 reviews
Qantas Airways
7.5
Good
992 reviews

Crew

8.1

Boarding

7.7

Comfort

7.5

Food

7.0

Overall

7.5

Entertainment

7.2

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.

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 23h 25m. Fly via Air Canada, American Airlines, or Delta 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.

  • What is the cheapest airline to fly from Sydney to St. Louis round-trip?

    Our cheapest airline available from Sydney to St. Louis is Qantas Airways. Our recent data shows that you can find tickets from as low as $1,101 on this airline. Users have found that Qantas Airways is 17% cheaper than the other options available to this destination.

  • 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, November is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $834). Flying from Sydney to St. Louis in December is currently the most expensive (average of $1,262). 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Sydney to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Sydney to St. Louis

Discover the top airline that operate flights from Sydney to St. Louis. 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 February 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,101Average$1,789FlexibilityNo cancel feeOn-time74%

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