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Cheap flights from St. Louis to Sydney from $909

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
10 Sep — 17 Sep1
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 11 August 2026.

Mon 26/1014:55 -
2 stops27h 40m
Sat 14/1119:25 -
2 stops44h 01m
Deal found 9/8$1,777
Tue 13/1015:12 -
2 stops25h 33m
Fri 13/1109:55 -
2 stops29h 31m
Deal found 10/8$1,817
Wed 23/917:00 -
1 stop22h 55m
Wed 7/1013:00 -
1 stop21h 20m
Deal found 11/8$1,858
Sat 14/1119:05 -
2 stops45h 35m
Wed 18/1109:15 -
1 stop26h 23m
Deal found 10/8$1,869
Mon 7/908:42 -
1 stop31h 13m
Sun 27/910:20 -
1 stop23h 23m
Deal found 10/8$1,880
Wed 9/915:34 -
1 stop24h 21m
Wed 16/912:00 -
1 stop21h 04m
Deal found 10/8$1,882
Wed 23/912:59 -
2 stops27h 01m
Wed 7/1011:20 -
2 stops21h 17m
Deal found 10/8$1,886
Wed 23/915:52 -
2 stops23h 58m
Wed 7/1010:15 -
2 stops24h 00m
Deal found 7/8$1,888
Sun 23/808:42 -
2 stops33h 03m
Wed 26/807:50 -
2 stops29h 37m
Deal found 9/8$1,895

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 11 August 2026.

Round-trip from

$1,749

One-way from

$909

Popular in

December

Cheapest in

July

Average price

$1,905
Air New Zealand
  • Air New Zealand
  • 2/2-9/2
  • 4 total stops
  • 57h 46m total
  • St. Louis to Sydney
Search Deals
Qantas Airways
  • Qantas Airways
  • 23/8
  • 1 total stop
  • 34h 05m total
  • St. Louis to Sydney
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($185 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($41 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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 11 August 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

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 14/11

19:05-09:40

2 stops45h 35m

Sydney Kingsford Smith

Wed 18/11

09:15-18:38

1 stop26h 23m

$1,869

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/9

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Sun 27/9

10:20-18:43

1 stop23h 23m

$1,880
Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

15:32-07:00

2 stops24h 28m

Sydney Kingsford Smith

Wed 7/10

11:20-18:43

1 stop23h 23m

$1,886
Cheapest one-way

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 24/8

18:45-18:50

2 stops57h 05m

$1,099

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 25/8

17:27-18:50

3 stops34h 23m

$1,148

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 25/8

06:00-19:40

2 stops46h 40m

$1,153

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 20/8

08:42-06:55

1 stop31h 13m

$1,191

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 21/8

08:42-06:55

1 stop31h 13m

$1,191

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 26/8

18:08-18:50

2 stops33h 42m

$1,310
Fastest single journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 5/1

18:44-14:20

2 stops26h 36m

$2,318

Flights are sorted by cheapest return flights first.

Deals found on 8/8

Showing 1-10 of 11 resultsSorted by cheapest first
1
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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, July is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,644). Flying from St. Louis to Sydney in December is currently the most expensive (average of $2,314). 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 for a return flight from St. Louis to Sydney?

Airfare is below average for this route at the moment.

St. Louis to Sydney flights typically cost between $1,861 and $2,201 in February.
The cheapest return price found within the last 5 days was $1,749 on Air New Zealand (2 Feb–9 Feb).

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 45h 35m. United Airlines provides one of the quickest options available for as low as $1,869. There are 14571 km between St. Louis and Sydney.

  • 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, July is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,644). Flying from St. Louis to Sydney in December is currently the most expensive (average of $2,314). 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
Randwick
Terrigal
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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