HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$697+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
May 22 — May 291
Fri 5/22
Fri 5/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Sydney to St. Louis 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 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 April 22, 2026.

This Air Canada deal was found by Cheapflights users on 4/22. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:20 am
SYD
-
STL
2 stops41h 46m
Multiple Airlines
Thu 5/284:48 pm
STL
-
SYD
2 stops23h 32m
Multiple Airlines
Deal found 4/22$1,065
This BYOjet deal was found by Cheapflights users on 4/21. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/229:20 am
SYD
-
STL
2 stops22h 13m
Air Canada
Fri 5/294:48 pm
STL
-
SYD
2 stops23h 32m
Air Canada
Deal found 4/21$1,093
This Air Canada deal was found by Cheapflights users on 4/21. 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.
Fri 5/89:20 am
SYD
-
STL
2 stops44h 08m
Air Canada
Tue 5/127:05 am
STL
-
SYD
2 stops33h 15m
Air Canada
Deal found 4/21$1,108
This Air Canada deal was found by Cheapflights users on 4/21. 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 5/209:20 am
SYD
-
STL
2 stops26h 05m
Air Canada
Thu 5/281:05 pm
STL
-
SYD
3 stops51h 15m
Air Canada
Deal found 4/21$1,109
This Gotogate deal was found by Cheapflights users on 4/22. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/109:20 am
SYD
-
STL
2 stops49h 47m
Air Canada
Thu 9/32:40 pm
STL
-
SYD
2 stops49h 40m
Air Canada
Deal found 4/22$1,170
This FlightHub deal was found by Cheapflights users on 4/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:25 am
SYD
-
STL
2 stops32h 32m
Qantas Airways
Wed 5/66:21 am
STL
-
SYD
1 stop33h 44m
Qantas Airways
Deal found 4/22$1,488

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 April 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,066
(Air Canada)

One-way from

$697
(Kiwi.com)

Popular in

April

Cheapest in

September

Average price

$1,640
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. 5% potential increase in price ($70 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 22, 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

Fri 8/14

9:30 am-9:22 pm

2 stops26h 52m

Lambert-St Louis

Sun 9/6

1:18 pm-7:00 am

2 stops26h 42m

$1,550

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/5

11:55 am-11:57 pm

3 stops27h 02m

Lambert-St Louis

Sat 8/29

3:02 pm-8:45 am

2 stops26h 43m

$1,734

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 6/20

9:15 am-8:39 pm

2 stops26h 24m

Lambert-St Louis

Sun 7/19

7:08 am-6:50 am

2 stops32h 42m

$1,927

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/10

9:55 am-8:42 pm

2 stops25h 47m

Lambert-St Louis

Thu 9/3

10:24 am-8:45 am

3 stops31h 21m

$1,937

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 8/14

11:55 am-11:50 pm

3 stops26h 55m

Lambert-St Louis

Sun 9/6

1:36 pm-8:45 am

3 stops28h 09m

$1,937
Quickest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 7/8

9:30 am-7:23 pm

2 stops24h 53m

Lambert-St Louis

Mon 7/20

7:23 pm-6:55 am

1 stop20h 32m

$1,940

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 5/8

8:45 pm-11:59 pm

2 stops42h 14m

Lambert-St Louis

Tue 5/12

11:06 am-5:30 pm

2 stops39h 24m

$1,996

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

10:30 am-11:56 pm

3 stops28h 26m

Lambert-St Louis

Thu 5/28

1:19 pm-9:20 am

3 stops29h 01m

$2,122
Cheapest one-way

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 10/17

9:20 am-11:05 pm

3 stops29h 45m

$697

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/30

10:00 pm-11:59 pm

2 stops40h 59m

$841

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/21

Showing 1-10 of 13 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 April is currently the most expensive (average of $1,640). 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 26h 24m. Fly via United 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.

  • 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 April is currently the most expensive (average of $1,640). 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

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 for Sydney to St. Louis

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

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights