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Cheap flights from St. Louis to Sydney from $793

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
31 Jul — 7 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from St. Louis to Sydney

Enter your travel dates to find the best prices.

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 1 July 2026.

Mon 10/806:00
STL
-
SYD
1 stop34h 30m
Qantas Airways
Mon 17/809:10
SYD
-
STL
1 stop28h 49m
Qantas Airways
Deal found 30/6$1,671
Wed 12/808:42
STL
-
SYD
1 stop31h 13m
Air New Zealand
Wed 19/810:20
SYD
-
STL
1 stop23h 19m
Air New Zealand
Deal found 29/6$1,704
Mon 10/816:48
STL
-
SYD
2 stops23h 12m
Air New Zealand
Mon 17/809:30
SYD
-
STL
2 stops24h 46m
Air New Zealand
Deal found 30/6$1,707
Sun 5/719:23
STL
-
SYD
1 stop20h 32m
United Airlines
Sun 19/709:30
SYD
-
STL
2 stops28h 15m
United Airlines
Deal found 29/6$1,711
Wed 1/719:23
STL
-
SYD
1 stop20h 32m
Air New Zealand
Wed 8/710:20
SYD
-
STL
1 stop22h 57m
Air New Zealand
Deal found 30/6$1,719
Mon 10/819:23
STL
-
SYD
1 stop20h 32m
United Airlines
Mon 17/810:20
SYD
-
STL
1 stop23h 19m
United Airlines
Deal found 29/6$1,720
Tue 11/816:40
STL
-
SYD
2 stops23h 15m
Air New Zealand
Tue 18/809:30
SYD
-
STL
2 stops22h 04m
Air New Zealand
Deal found 29/6$1,724
Mon 10/815:39
STL
-
SYD
2 stops24h 11m
Delta
Mon 17/809:15
SYD
-
STL
2 stops29h 11m
Delta
Deal found 30/6$1,726
Mon 10/806:00
STL
-
SYD
1 stop34h 05m
American Airlines
Mon 17/809:10
SYD
-
STL
2 stops23h 55m
American Airlines
Deal found 30/6$1,735
Tue 21/709:44
STL
-
SYD
1 stop30h 11m
American Airlines
Tue 28/717:50
SYD
-
STL
1 stop21h 09m
American Airlines
Deal found 26/6$1,745

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 1 July 2026.

Round-trip from

$1,671

One-way from

$793

Popular in

June

Cheapest in

March

Average price

$1,891
Qantas Airways
  • Qantas Airways
  • 10/8-17/8
  • 2 total stops
  • 63h 19m total
  • St. Louis to Sydney
Search Deals
9/8
  • 9/8
  • 3 total stops
  • 52h 41m total
  • St. Louis to Sydney
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($25 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($53 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 1 July 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 return flight
Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Mon 17/8

10:20-18:39

1 stop23h 19m

$1,720

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Wed 19/8

10:20-18:39

1 stop23h 19m

$1,720

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

15:39-06:50

2 stops24h 11m

Sydney Kingsford Smith

Mon 17/8

09:15-23:26

2 stops29h 11m

$1,726

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Fri 21/8

10:20-18:39

1 stop23h 19m

$1,793

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Mon 14/9

10:20-18:39

1 stop23h 19m

$1,894

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

11:35-08:00

2 stops28h 25m

Sydney Kingsford Smith

Wed 18/11

09:15-14:13

1 stop21h 58m

$1,900

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 31/10

17:55-07:00

1 stop45h 05m

Sydney Kingsford Smith

Mon 23/11

11:20-16:56

2 stops22h 36m

$1,912

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 3/9

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Wed 16/9

10:20-18:39

1 stop23h 19m

$1,967
Cheapest one-way

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 9/8

16:09-11:50

3 stops52h 41m

$793

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 9/8

14:10-06:50

2 stops25h 40m

$906

Flights are sorted by cheapest return flights first.

Deals found on 28/6

Showing 1-10 of 16 resultsSorted by cheapest first
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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 return 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 $1,819). Flying from St. Louis to Sydney in June is currently the most expensive (average of $2,474). 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.

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?

    A quick flight from St. Louis to Sydney can take about 20h 32m. United Airlines provides one of the quickest options available for as low as $1,720. There are 14571 km between St. Louis and Sydney. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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 holiday 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 $1,819). Flying from St. Louis to Sydney in June is currently the most expensive (average of $2,474). 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

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Manly
Katoomba
Lithgow
Cronulla
Terrigal
Randwick
Leura
Bondi Beach
Coogee

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

Fly with Cheapflights

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How does Cheapflights help users find flights from St. Louis to Sydney?

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Why should you use Cheapflights to find cheap flight tickets from St. Louis to Sydney?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Sydney from St. Louis.

Can Cheapflights find flights from St. Louis to Sydney with no change fees?

Need flexible booking options for your flight to Sydney from St. Louis? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Sydney become cheaper?

Yes! Start tracking prices for St. Louis to Sydney flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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