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Cheap flights from St. Louis to Sydney from $1,023

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
30 Mar — 6 Apr1
1 adult

Cheap 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 25 March 2025.

Round-trip from

$1,914

One-way from

$1,023

Popular in

December

Cheapest in

November

Average price

$2,313
Fiji Airways
  • Fiji Airways
  • 6/5-17/5
  • 4 total stops
  • 59h 52m total
  • St. Louis to Sydney
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Fiji Airways
  • Fiji Airways
  • 23/8
  • 2 total stops
  • 37h 00m total
  • St. Louis to Sydney
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($311 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease ($74 potential savings vs. average return price).
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Average for round-trip flights in March 2025
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Find 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 25 March 2025.

Tue 6/519:19STL - SYD
2 stops35h 51mFiji Airways
Sat 17/513:45SYD - STL
2 stops24h 01mFiji Airways
Deal found 25/3$1,914
Sun 1/613:30STL - SYD
2 stops26h 50mAir Canada
Sun 15/609:20SYD - STL
2 stops25h 38mAir Canada
Deal found 24/3$1,976
Sat 17/519:19STL - SYD
2 stops25h 26mMultiple Airlines
Mon 26/516:20SYD - STL
2 stops22h 44mMultiple Airlines
Deal found 24/3$2,104
Sun 18/506:52STL - SYD
1 stop33h 13mAmerican Airlines
Sun 1/609:10SYD - STL
1 stop28h 54mAmerican Airlines
Deal found 25/3$2,294
Mon 19/519:19STL - SYD
1 stop20h 36mQantas Airways
Wed 28/517:45SYD - STL
1 stop20h 19mQantas Airways
Deal found 25/3$2,307
Sun 18/513:41STL - SYD
2 stops26h 14mUnited Airlines
Tue 27/510:20SYD - STL
1 stop22h 40mUnited Airlines
Deal found 25/3$2,316
Sun 13/717:51STL - SYD
2 stops25h 44mAir New Zealand
Sun 20/711:50SYD - STL
2 stops25h 25mAir New Zealand
Deal found 24/3$2,391
Sun 18/509:40STL - SYD
2 stops42h 35mANA
Thu 29/511:50SYD - STL
2 stops44h 03mANA
Deal found 25/3$3,291
Sun 13/711:51STL - SYD
3 stops54h 44mLATAM Airlines
Sun 20/711:50SYD - STL
3 stops45h 13mLATAM Airlines
Deal found 24/3$5,359
Fri 9/519:30STL - SYD
3 stops42h 50mBritish Airways
Fri 16/514:40SYD - STL
3 stops42h 48mBritish Airways
Deal found 24/3$6,368

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 25 March 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 6/5

19:19-22:10

2 stops35h 51m

Sydney Kingsford Smith

Sat 17/5

13:45-22:46

2 stops24h 01m

$1,914

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/6

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Sun 15/6

09:20-19:58

2 stops25h 38m

$1,976

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 17/5

19:19-11:45

2 stops25h 26m

Sydney Kingsford Smith

Mon 26/5

16:20-00:04

2 stops22h 44m

$2,104

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 18/5

06:52-07:05

1 stop33h 13m

Sydney Kingsford Smith

Sun 1/6

09:10-23:04

1 stop28h 54m

$2,294

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 19/5

19:19-06:55

1 stop20h 36m

Sydney Kingsford Smith

Wed 28/5

17:45-23:04

1 stop20h 19m

$2,307

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 18/5

13:41-06:55

2 stops26h 14m

Sydney Kingsford Smith

Tue 27/5

10:20-18:00

1 stop22h 40m

$2,316

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 13/7

17:51-10:35

2 stops25h 44m

Sydney Kingsford Smith

Sun 20/7

11:50-22:15

2 stops25h 25m

$2,391

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 18/5

09:40-19:15

2 stops42h 35m

Sydney Kingsford Smith

Thu 29/5

11:50-16:53

2 stops44h 03m

$3,291

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 13/7

11:51-09:35

3 stops54h 44m

Sydney Kingsford Smith

Sun 20/7

11:50-18:03

3 stops45h 13m

$5,359

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 9/5

19:30-05:20

3 stops42h 50m

Sydney Kingsford Smith

Fri 16/5

14:40-18:28

3 stops42h 48m

$6,368

Flights are sorted by cheapest return flights first.

Deals found on 24/3

Showing 1-10 of 16 results
1
2

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 21 March 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Sydney, you should look to book at least 19 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, May is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $129). Flying from St. Louis to Sydney in October is currently the most expensive (average of $171). 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.

Rainfall in Sydney by month

Plan your trip to Sydney by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sydney ranges from 50.0 - 130.0 inches per month. March is typically the wettest month, when rainfall can reach 130.0 mm. September is typically the driest time to visit Sydney when rainfall is around 50.0 mm.

Temperature in Sydney by month

Plan your trip to Sydney by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 11.0 C).

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 25 March 2025.
ANA
8.3
Very Good
826 reviews
Check prices

Boarding

8.5

Food

7.6

Overall

8.3

Comfort

8.2

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
ANA
8.3
Very Good
826 reviews
ANA
8.3
Very Good
826 reviews
Check prices

Boarding

8.5

Food

7.6

Overall

8.3

Comfort

8.2

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Fiji Airways
8.0
Very Good
182 reviews
ANA
8.3
Very Good
826 reviews
Check prices

Boarding

8.5

Food

7.6

Overall

8.3

Comfort

8.2

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Air New Zealand
7.9
Good
455 reviews
ANA
8.3
Very Good
826 reviews
Check prices

Boarding

8.5

Food

7.6

Overall

8.3

Comfort

8.2

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Qantas Airways
7.5
Good
809 reviews
ANA
8.3
Very Good
826 reviews
Check prices

Boarding

8.5

Food

7.6

Overall

8.3

Comfort

8.2

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
LATAM Airlines
7.5
Good
1,749 reviews
ANA
8.3
Very Good
826 reviews
Check prices

Boarding

8.5

Food

7.6

Overall

8.3

Comfort

8.2

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.

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.

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

    Our cheapest airline available from St. Louis to Sydney is Fiji Airways. Our recent data shows that you can find tickets from as low as $1,914 on this airline. Additional options worth looking into are Air Canada and American Airlines, starting at $1,976 and $2,294 round-trip. Fiji Airways is 22% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from St. Louis to Sydney one-way?

    The cheapest airline one-way is Fiji Airways, with whom users have recently found tickets for as low as $1,023. However, be on the lookout for offers from Air Canada and American Airlines, as they are both options that can get you from St. Louis to Sydney for a low price.

  • 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, May is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $129). Flying from St. Louis to Sydney in October is currently the most expensive (average of $171). 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 St. Louis?

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

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

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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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