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Cheap flights from St. Louis to Sydney from $1,000

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
29 Jan — 5 Feb1
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 30 December 2025.

Wed 31/1215:30STL - SYD
2 stops30h 20mQantas Airways
Wed 7/117:50SYD - STL
2 stops37h 57mQantas Airways
Deal found 30/12$2,054
Wed 31/1206:00STL - SYD
1 stop32h 00mUnited Airlines
Wed 7/112:10SYD - STL
1 stop20h 27mUnited Airlines
Deal found 30/12$3,155
Tue 30/1206:41STL - SYD
2 stops33h 04mAir New Zealand
Thu 1/112:10SYD - STL
1 stop21h 34mAir New Zealand
Deal found 29/12$3,397
Tue 30/1209:55STL - SYD
2 stops30h 10mUnited Airlines
Thu 1/113:00SYD - STL
2 stops50h 30mUnited Airlines
Deal found 29/12$3,825
Tue 30/1206:20STL - SYD
1 stop33h 40mQantas Airways
Thu 1/114:05SYD - STL
1 stop22h 17mQantas Airways
Deal found 29/12$4,528
Wed 31/1215:30STL - SYD
3 stops47h 30mCathay Pacific
Wed 7/111:05SYD - STL
2 stops29h 54mCathay Pacific
Deal found 30/12$5,687
Wed 31/1206:20STL - SYD
1 stop33h 40mQantas Airways
Tue 6/113:05SYD - STL
2 stops44h 09mQantas Airways
Deal found 30/12$10,402

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 30 December 2025.

Round-trip from

$1,369

One-way from

$1,000

Popular in

December

Cheapest in

August

Average price

$2,635
Qantas Airways
  • Qantas Airways
  • 8/2-15/2
  • 3 total stops
  • 66h 39m total
  • St. Louis to Sydney
Search Deals
2/3
  • 2/3
  • 2 total stops
  • 24h 05m total
  • St. Louis to Sydney
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($157 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($64 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
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 30 December 2025.
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

Tue 10/2

07:04-09:00

1 stop32h 56m

Sydney Kingsford Smith

Tue 17/2

07:05-23:59

2 stops33h 54m

$1,369

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/2

07:04-09:00

1 stop32h 56m

Sydney Kingsford Smith

Sun 15/2

07:05-23:48

2 stops33h 43m

$1,369

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/3

18:50-20:50

2 stops34h 00m

Sydney Kingsford Smith

Mon 16/3

11:20-23:59

1 stop28h 39m

$1,402

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 22/1

07:04-20:50

2 stops44h 46m

Sydney Kingsford Smith

Thu 29/1

11:20-23:59

1 stop29h 39m

$1,404

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/3

06:38-09:00

1 stop34h 22m

Sydney Kingsford Smith

Tue 24/3

17:50-15:28

2 stops37h 38m

$1,404

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 10/2

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Tue 17/2

11:20-15:29

2 stops45h 09m

$1,711

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 5/6

06:30-10:55

2 stops37h 25m

Sydney Kingsford Smith

Sat 13/6

12:00-16:10

1 stop19h 10m

$1,717

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:30-13:15

2 stops39h 45m

Sydney Kingsford Smith

Mon 18/5

12:00-18:17

1 stop21h 17m

$1,717

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 2/5

06:30-07:05

1 stop33h 35m

Sydney Kingsford Smith

Sat 16/5

12:00-16:11

1 stop19h 11m

$1,719

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/3

16:30-09:35

2 stops24h 05m

$1,000

Flights are sorted by cheapest return flights first.

Deals found on 28/12

Showing 1-10 of 16 results
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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

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

Use this chart to determine the optimal time to book a return flight from St. Louis to Sydney. Price data was last updated on 26 December 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Sydney, you should look to book at least 57 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 $1,052). Flying from St. Louis to Sydney in March is currently the most expensive (average of $1,917). 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?

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 32h 56m. Qantas Airways provides one of the quickest options available for as low as $1,369. 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, August is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,052). Flying from St. Louis to Sydney in March is currently the most expensive (average of $1,917). 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
Katoomba
Penrith
Terrigal
Manly
Lithgow
Randwick
Coogee
Leura
Cronulla
Bondi Beach

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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