Find flights
When to book
Airlines
FAQs

Cheap flights from St. Louis to Sydney from $885

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 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
5 May — 12 May1
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 30 April 2025.

Round-trip from

$1,959

One-way from

$885

Popular in

December

Cheapest in

November

Average price

$2,348
Qantas Airways
  • Qantas Airways
  • 9/6-20/6
  • 2 total stops
  • 48h 57m total
  • St. Louis to Sydney
Search Deals
26/8
  • 26/8
  • 2 total stops
  • 32h 05m total
  • St. Louis to Sydney
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($324 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($71 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 30 April 2025.

Mon 9/619:47STL - SYD
1 stop20h 08mQantas Airways
Fri 20/609:10SYD - STL
1 stop28h 49mQantas Airways
Deal found 28/4$1,959
Wed 20/817:49STL - SYD
2 stops23h 56mAir New Zealand
Wed 3/909:55SYD - STL
2 stops27h 21mAir New Zealand
Deal found 28/4$1,969
Tue 24/613:21STL - SYD
2 stops25h 44mAmerican Airlines
Tue 8/717:45SYD - STL
1 stop20h 36mAmerican Airlines
Deal found 29/4$2,073
Thu 5/607:30STL - SYD
2 stops32h 50mAir Canada
Thu 12/609:20SYD - STL
2 stops42h 16mAir Canada
Deal found 28/4$2,102
Wed 20/816:40STL - SYD
3 stops26h 55mMultiple Airlines
Wed 3/909:55SYD - STL
2 stops27h 21mMultiple Airlines
Deal found 28/4$2,117
Mon 9/613:42STL - SYD
2 stops26h 13mUnited Airlines
Fri 20/610:20SYD - STL
1 stop22h 40mUnited Airlines
Deal found 28/4$2,119
Mon 9/609:28STL - SYD
2 stops30h 07mDelta
Mon 23/609:25SYD - STL
2 stops27h 09mDelta
Deal found 28/4$2,141
Thu 1/517:27STL - SYD
2 stops27h 48mFiji Airways
Thu 8/506:15SYD - STL
2 stops31h 30mFiji Airways
Deal found 29/4$2,440
Tue 29/415:08STL - SYD
2 stops61h 37mAlaska Airlines
Tue 6/521:40SYD - STL
2 stops41h 19mAlaska Airlines
Deal found 28/4$2,489
Thu 1/514:19STL - SYD
2 stops35h 51mQatar Airways
Sat 3/520:45SYD - STL
2 stops40h 29mQatar Airways
Deal found 28/4$3,426
Mon 9/608:10STL - SYD
3 stops43h 50mTurkish Airlines
Fri 20/620:55SYD - STL
3 stops40h 50mTurkish Airlines
Deal found 28/4$6,164
Thu 5/616:23STL - SYD
3 stops45h 57mBritish Airways
Thu 12/614:40SYD - STL
3 stops43h 37mBritish Airways
Deal found 28/4$6,358

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 April 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

Mon 9/6

19:47-06:55

1 stop20h 08m

Sydney Kingsford Smith

Fri 20/6

09:10-22:59

1 stop28h 49m

$1,959

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 20/8

17:49-08:45

2 stops23h 56m

Sydney Kingsford Smith

Wed 3/9

09:55-22:16

2 stops27h 21m

$1,969

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 24/6

13:21-06:05

2 stops25h 44m

Sydney Kingsford Smith

Tue 8/7

17:45-23:21

1 stop20h 36m

$2,073

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 16/8

15:24-14:40

2 stops32h 16m

Sydney Kingsford Smith

Sat 30/8

13:45-23:14

2 stops24h 29m

$2,097

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 5/6

07:30-07:20

2 stops32h 50m

Sydney Kingsford Smith

Thu 12/6

09:20-12:36

2 stops42h 16m

$2,102

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/6

13:42-06:55

2 stops26h 13m

Sydney Kingsford Smith

Fri 20/6

10:20-18:00

1 stop22h 40m

$2,119

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/6

09:28-06:35

2 stops30h 07m

Sydney Kingsford Smith

Mon 23/6

09:25-21:34

2 stops27h 09m

$2,141

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 14/5

06:30-19:45

2 stops46h 15m

Sydney Kingsford Smith

Sat 17/5

21:40-14:07

2 stops31h 27m

$2,606

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 14/5

10:31-10:50

2 stops33h 19m

Sydney Kingsford Smith

Mon 2/6

07:40-22:45

2 stops30h 05m

$5,490

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/6

08:10-19:00

3 stops43h 50m

Sydney Kingsford Smith

Fri 20/6

20:55-22:45

3 stops40h 50m

$6,164

Flights are sorted by cheapest return flights first.

Deals found on 29/4

Showing 1-10 of 18 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 25 April 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to Sydney, you should look to book at least 83 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 30 April 2025.
ANA
8.3
Very Good
852 reviews
Check prices

Comfort

8.1

Boarding

8.5

Overall

8.3

Crew

8.7

Food

7.6

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
852 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Comfort

8.1

Boarding

8.5

Overall

8.3

Crew

8.7

Food

7.6

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.
Alaska Airlines
8.0
Very Good
9,968 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Comfort

8.1

Boarding

8.5

Overall

8.3

Crew

8.7

Food

7.6

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.
Delta
8.0
Very Good
7,936 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Comfort

8.1

Boarding

8.5

Overall

8.3

Crew

8.7

Food

7.6

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
8.0
Very Good
472 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Comfort

8.1

Boarding

8.5

Overall

8.3

Crew

8.7

Food

7.6

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
829 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Comfort

8.1

Boarding

8.5

Overall

8.3

Crew

8.7

Food

7.6

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 Qantas Airways. Our recent data shows that you can find tickets from as low as $1,959 on this airline. Additional options worth looking into are Air New Zealand and American Airlines, starting at $1,969 and $2,073 round-trip. Qantas Airways is 17% 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 ANA, with whom users have recently found tickets for as low as $1,297. However, be on the lookout for offers from United Airlines and Qantas Airways, 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
Randwick
Terrigal
Cronulla
Lithgow
Bondi Beach
Leura
Swansea

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

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Sydney from St. Louis today with Cheapflights!

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.

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.
Site
©2025 Cheapflights