HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$480+ 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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 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 January 27, 2026.

This oojo deal was found by Cheapflights users on 1/24. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/317:04 am
STL
-
SYD
1 stop32h 56m
Qantas Airways
Sat 2/77:05 am
SYD
-
STL
2 stops33h 54m
Qantas Airways
Deal found 1/24$961
This oojo deal was found by Cheapflights users on 1/25. 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.
Sun 3/154:13 pm
STL
-
SYD
2 stops33h 27m
Qantas Airways
Tue 3/2411:20 am
SYD
-
STL
1 stop28h 38m
Qantas Airways
Deal found 1/25$975
This oojo deal was found by Cheapflights users on 1/26. 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 2/236:38 am
STL
-
SYD
2 stops58h 27m
Qantas Airways
Sat 2/285:45 pm
SYD
-
STL
1 stop23h 14m
Qantas Airways
Deal found 1/26$992
This oojo deal was found by Cheapflights users on 1/25. 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.
Sat 2/216:38 am
STL
-
SYD
2 stops55h 57m
Qantas Airways
Sat 2/2811:20 am
SYD
-
STL
1 stop29h 39m
Qantas Airways
Deal found 1/25$994
This FlightHub deal was found by Cheapflights users on 1/26. 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.
Wed 2/256:38 am
STL
-
SYD
1 stop33h 22m
Qantas Airways
Wed 3/47:05 am
SYD
-
STL
2 stops33h 54m
Qantas Airways
Deal found 1/26$1,006
This FlightHub deal was found by Cheapflights users on 1/26. 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.
Mon 2/236:18 pm
STL
-
SYD
2 stops46h 47m
Qantas Airways
Mon 3/211:20 am
SYD
-
STL
1 stop29h 39m
Qantas Airways
Deal found 1/26$1,030
This FlightHub deal was found by Cheapflights users on 1/27. 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.
Sat 3/74:13 pm
STL
-
SYD
2 stops46h 22m
Qantas Airways
Sat 3/1411:20 am
SYD
-
STL
1 stop28h 38m
Qantas Airways
Deal found 1/27$1,034
This oojo deal was found by Cheapflights users on 1/27. 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.
Thu 2/266:38 am
STL
-
SYD
2 stops45h 12m
Qantas Airways
Thu 3/55:45 pm
SYD
-
STL
1 stop23h 14m
Qantas Airways
Deal found 1/27$1,144
This Expedia deal was found by Cheapflights users on 1/27. 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 10/15:20 am
STL
-
SYD
2 stops35h 00m
Air Canada
Fri 10/239:20 am
SYD
-
STL
2 stops27h 39m
Air Canada
Deal found 1/27$1,182
This Orbitz deal was found by Cheapflights users on 1/27. 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.
Fri 4/106:05 pm
STL
-
SYD
2 stops46h 15m
Air Canada
Tue 4/149:20 am
SYD
-
STL
2 stops46h 36m
Air Canada
Deal found 1/27$1,189

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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$975
(oojo)

One-way from

$480
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$1,460
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. 2% potential increase in price ($41 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 27, 2026.
Use the filters below to find and compare flights from St. Louis to Sydney that are best for you.

Fly from

St. Louis

Fly to

Sydney

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 3/15

4:13 pm-8:50 pm

2 stops36h 37m

Sydney Kingsford Smith

Tue 3/24

11:20 am-11:58 pm

1 stop28h 38m

$975

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/23

6:38 am-10:05 am

2 stops58h 27m

Sydney Kingsford Smith

Sat 2/28

5:45 pm-11:59 pm

1 stop23h 14m

$992

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 2/25

6:38 am-9:00 am

1 stop33h 22m

Sydney Kingsford Smith

Wed 3/4

7:05 am-11:59 pm

2 stops33h 54m

$1,006

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 3/15

2:31 pm-9:00 am

2 stops26h 29m

Sydney Kingsford Smith

Tue 3/24

11:20 am-7:29 pm

2 stops24h 09m

$1,264

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 3/4

6:38 am-7:25 am

1 stop31h 47m

Sydney Kingsford Smith

Tue 3/10

11:20 am-11:58 pm

1 stop28h 38m

$1,266

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/23

6:38 am-9:00 am

1 stop33h 22m

Sydney Kingsford Smith

Mon 3/2

2:05 pm-7:29 pm

1 stop22h 24m

$1,271

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 2/14

4:30 pm-9:05 am

2 stops47h 35m

Sydney Kingsford Smith

Wed 2/18

12:10 pm-8:26 pm

2 stops25h 16m

$1,297

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/10

8:06 pm-12:35 pm

3 stops48h 29m

$535

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/9

12:14 pm-7:25 am

2 stops27h 11m

$592

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/2

6:18 pm-12:15 pm

2 stops24h 57m

$682

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 14 results
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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 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

How far ahead should I book a flight from St. Louis to Sydney?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Sydney. Price data was last updated on January 23, 2026.

The best time to book flights from St. Louis to Sydney is 57 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $671). Flying from St. Louis to Sydney in June is currently the most expensive (average of $1,257). 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 January 27, 2026.
Get a feel of what it's like to fly with Fiji Airways, Qantas Airways, and United 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
8.0
Very good
222 reviews

Boarding

8.1

Crew

8.5

Food

7.4

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
Fiji Airways
8.0
Very good
222 reviews
Fiji Airways
8.0
Very good
222 reviews

Boarding

8.1

Crew

8.5

Food

7.4

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
Qantas Airways
7.5
Good
978 reviews
Fiji Airways
8.0
Very good
222 reviews

Boarding

8.1

Crew

8.5

Food

7.4

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
United Airlines
7.4
Good
9,205 reviews
Fiji Airways
8.0
Very good
222 reviews

Boarding

8.1

Crew

8.5

Food

7.4

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
American Airlines
7.2
Good
11,197 reviews
Fiji Airways
8.0
Very good
222 reviews

Boarding

8.1

Crew

8.5

Food

7.4

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
Air Canada
7.1
Good
10,660 reviews
Fiji Airways
8.0
Very good
222 reviews

Boarding

8.1

Crew

8.5

Food

7.4

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

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 26h 29m. Fly via Qantas Airways or American Airlines to get the fastest option. The distance between St. Louis and Sydney is about 9054 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, Air Canada ($608), Fiji Airways ($1,132), and Qantas Airways ($1,207) offers the cheapest pricing from St. Louis to Sydney. Air Canada is priced at 57% 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, August is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $671). Flying from St. Louis to Sydney in June is currently the most expensive (average of $1,257). 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
Manly

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 St. Louis to Sydney

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

Top 5 airlines flying from St. Louis to Sydney

Discover the top 5 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 January 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$608Average$1,250FlexibilityNo cancel feeOn-time67%
Fiji AirwaysCheapest$1,132Average$1,222FlexibilityNo cancel feeOn-time74%
Qantas AirwaysCheapest$1,207Average$1,447FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,211Average$1,512FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,259Average$1,495FlexibilityNo cancel feeOn-time71%

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.