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

Our cheapest airline available from St. Louis to Sydney is Air Canada. Our recent data shows that you can find tickets from as low as $1,973 on this airline. Additional options worth looking into are American Airlines and Qantas Airways, starting at $2,286 and $2,293 round-trip. Air Canada is 18% cheaper than the average price of flights available within the next 90 days to this destination. Find deals

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

The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $1,309. 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. Find deals

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 10 days in advance, which can save you up to 38% on flights from St. Louis to Sydney compared to booking the week you need them. Waiting 10 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $1,889. For sooner than that we have options available in the next 3 days from $2,777.

What is the cheapest month to fly from St. Louis to Sydney?

The best pricing can be found in the month of November. Prices to Sydney from St. Louis average $2,431. You can even find prices in November for less than $2,431, as users have found deals to Sydney from as low as $1,951. The month of December appears to be one of the more expensive times to travel to Sydney from St. Louis. Flying in the targeted month can save you up to 19%.

What is the cheapest time of day to fly from STL to SYD?

A simple way to save on the total cost of your ticket is to fly from St. Louis to Sydney at midday. If you’re flexible enough to do this you can expect to save up to 29% on your trip compared to booking a flight in the morning.

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.

$1,043+ Flights from St. Louis to Sydney

Cheap flight deals from St. Louis to Sydney

Round-trip from	$1,973
One-way from	$1,043
Popular in	December
Cheapest in	November
Average price	$2,381

Air Canada
28/5-12/8
4 total stops
95h 51m total
St. Louis to Sydney

Search Deals

3/6
2 total stops
53h 22m total
St. Louis to Sydney

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($315 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 15 April 2025.

Wed 28/513:30STL - SYD

2 stops50h 50mAir Canada

Tue 12/809:20SYD - STL

2 stops45h 01mAir Canada

Deal found 14/4$1,973

Tue 15/417:27STL - SYD

2 stops27h 18mFiji Airways

Tue 22/406:15SYD - STL

2 stops31h 13mFiji Airways

Deal found 14/4$2,093

Tue 3/615:58STL - SYD

2 stops24h 07mAmerican Airlines

Wed 18/609:10SYD - STL

1 stop28h 49mAmerican Airlines

Deal found 14/4$2,286

Tue 3/619:19STL - SYD

1 stop20h 36mQantas Airways

Wed 18/609:10SYD - STL

1 stop28h 49mQantas Airways

Deal found 14/4$2,293

Wed 4/619:10STL - SYD

1 stop20h 45mUnited Airlines

Tue 12/810:20SYD - STL

1 stop21h 25mUnited Airlines

Deal found 14/4$2,302

Tue 15/715:30STL - SYD

2 stops24h 05mDelta

Tue 22/709:25SYD - STL

2 stops30h 13mDelta

Deal found 14/4$2,324

Wed 4/615:03STL - SYD

2 stops37h 42mAlaska Airlines

Thu 14/821:40SYD - STL

2 stops41h 19mAlaska Airlines

Deal found 14/4$2,472

Tue 3/619:19STL - SYD

2 stops25h 26mMultiple Airlines

Thu 5/616:20SYD - STL

2 stops22h 44mMultiple Airlines

Deal found 14/4$2,646

Mon 2/619:10STL - SYD

1 stop20h 45mAir New Zealand

Fri 15/811:50SYD - STL

2 stops25h 31mAir New Zealand

Deal found 14/4$3,187

Tue 15/415:40STL - SYD

3 stops36h 20mTurkish Airlines

Tue 22/420:55SYD - STL

3 stops56h 47mTurkish Airlines

Deal found 14/4$4,077

Mon 2/619:30STL - SYD

3 stops42h 50mBritish Airways

Wed 13/814:40SYD - STL

3 stops43h 28mBritish Airways

Deal found 14/4$6,737

Wed 11/608:35STL - SYD

2 stops44h 35mCathay Pacific

Sun 22/621:50SYD - STL

2 stops40h 29mCathay Pacific

Deal found 14/4$11,836

Best flights from St. Louis to Sydney
Discover carefully curated flight deals from St. Louis to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 April 2025.

Wed 28/513:30STL - SYD

2 stops50h 50mAir Canada

Tue 12/809:20SYD - STL

2 stops45h 01mAir Canada

Deal found 14/4$1,973

Tue 3/615:58STL - SYD

2 stops24h 07mAmerican Airlines

Wed 18/609:10SYD - STL

1 stop28h 49mAmerican Airlines

Deal found 14/4$2,286

Tue 3/619:19STL - SYD

1 stop20h 36mQantas Airways

Wed 18/609:10SYD - STL

1 stop28h 49mQantas Airways

Deal found 14/4$2,293

Wed 4/619:10STL - SYD

1 stop20h 45mUnited Airlines

Tue 12/810:20SYD - STL

1 stop21h 25mUnited Airlines

Deal found 14/4$2,302

Tue 15/715:30STL - SYD

2 stops24h 05mDelta

Tue 22/709:25SYD - STL

2 stops30h 13mDelta

Deal found 14/4$2,324

Sat 31/519:19STL - SYD

2 stops25h 26mFiji Airways

Sat 16/813:45SYD - STL

2 stops23h 45mFiji Airways

Deal found 14/4$2,391

Wed 4/615:03STL - SYD

2 stops37h 42mAlaska Airlines

Thu 14/821:40SYD - STL

2 stops41h 19mAlaska Airlines

Deal found 14/4$2,472

Tue 3/619:19STL - SYD

2 stops25h 26mMultiple Airlines

Thu 5/616:20SYD - STL

2 stops22h 44mMultiple Airlines

Deal found 14/4$2,646

Mon 2/619:10STL - SYD

1 stop20h 45mAir New Zealand

Fri 15/811:50SYD - STL

2 stops25h 31mAir New Zealand

Deal found 14/4$3,187

Mon 2/619:30STL - SYD

3 stops42h 50mBritish Airways

Wed 13/814:40SYD - STL

3 stops43h 28mBritish Airways

Deal found 14/4$6,737

Wed 11/608:35STL - SYD

2 stops44h 35mCathay Pacific

Sun 22/621:50SYD - STL

2 stops40h 29mCathay Pacific

Deal found 14/4$11,836

Wed 11/610:48STL - SYD

3 stops55h 47mLATAM Airlines

Sun 22/611:50SYD - STL

3 stops35h 33mLATAM Airlines

Deal found 14/4$13,213

Last-minute flights from St. Louis to Sydney
Discover last-minute flight deals from St. Louis to Sydney. Data last updated 15 April 2025 and is based on user searches.

Tue 15/417:27STL - SYD

2 stops27h 18mFiji Airways

Tue 22/406:15SYD - STL

2 stops31h 13mFiji Airways

Deal found 14/4$2,093

Tue 15/415:40STL - SYD

3 stops36h 20mTurkish Airlines

Tue 22/420:55SYD - STL

3 stops56h 47mTurkish Airlines

Deal found 14/4$4,077

Wed 14/516:15STL - SYD

2 stops23h 50mAmerican Airlines

Wed 21/509:10SYD - STL

1 stop28h 54mAmerican Airlines

Deal found 14/4$2,524

Wed 14/513:41STL - SYD

3 stops28h 04mMultiple Airlines

Wed 21/511:50SYD - STL

3 stops27h 02mMultiple Airlines

Deal found 14/4$2,844

Wed 28/513:30STL - SYD

2 stops50h 50mAir Canada

Tue 12/809:20SYD - STL

2 stops45h 01mAir Canada

Deal found 14/4$1,973

Wed 28/516:52STL - SYD

1 stop23h 03mQantas Airways

Tue 12/809:10SYD - STL

1 stop28h 47mQantas Airways

Deal found 14/4$2,516

Fri 30/518:22STL - SYD

2 stops34h 23mAlaska Airlines

Thu 14/821:40SYD - STL

2 stops41h 19mAlaska Airlines

Deal found 14/4$2,506

Fri 30/519:10STL - SYD

1 stop20h 45mUnited Airlines

Sun 10/810:20SYD - STL

1 stop21h 25mUnited Airlines

Deal found 14/4$2,619

One-way flights from St. Louis to Sydney
Search for one-way flight options from St. Louis to Sydney. Find affordable one-way fares based on user searches. Data last updated 15 April 2025.

Tue 3/618:18STL - SYD

2 stops53h 22mMultiple Airlines

Deal found 14/4$1,043

Wed 2/716:23STL - SYD

2 stops23h 42mAmerican Airlines

Deal found 14/4$1,309

Wed 2/717:41STL - SYD

1 stop22h 14mUnited Airlines

Deal found 14/4$1,321

Wed 14/506:52STL - SYD

1 stop33h 13mQantas Airways

Deal found 14/4$9,095

Cheapflights Fare Finder

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

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 28/5

13:30-07:20

2 stops50h 50m

Sydney Kingsford Smith

Tue 12/8

09:20-15:21

2 stops45h 01m

$1,973

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/6

15:58-07:05

2 stops24h 07m

Sydney Kingsford Smith

Wed 18/6

09:10-22:59

1 stop28h 49m

$2,286

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/6

19:19-06:55

1 stop20h 36m

Sydney Kingsford Smith

Wed 18/6

09:10-22:59

1 stop28h 49m

$2,293

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/6

19:10-06:55

1 stop20h 45m

Sydney Kingsford Smith

Mon 11/8

10:20-16:45

1 stop21h 25m

$2,302

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 15/7

15:30-06:35

2 stops24h 05m

Sydney Kingsford Smith

Tue 22/7

09:25-00:38

2 stops30h 13m

$2,324

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 31/5

19:19-11:45

2 stops25h 26m

Sydney Kingsford Smith

Sat 16/8

13:45-22:30

2 stops23h 45m

$2,391

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/6

15:03-19:45

2 stops37h 42m

Sydney Kingsford Smith

Thu 14/8

21:40-23:59

2 stops41h 19m

$2,472

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/6

19:19-11:45

2 stops25h 26m

Sydney Kingsford Smith

Thu 5/6

16:20-00:04

2 stops22h 44m

$2,646

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/6

19:10-06:55

1 stop20h 45m

Sydney Kingsford Smith

Fri 15/8

11:50-22:21

2 stops25h 31m

$3,187

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/6

19:30-05:20

3 stops42h 50m

Sydney Kingsford Smith

Wed 13/8

14:40-19:08

3 stops43h 28m

$6,737

Flights are sorted by cheapest return flights first.

Deals found on 14/4

Showing 1-10 of 16 results

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?

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

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

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

Alaska Airlines

8.0

Very Good

9,871 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Alaska Airlines

8.0

Very Good

9,871 reviews

Alaska Airlines

8.0

Very Good

9,871 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Fiji Airways

8.0

Very Good

183 reviews

Alaska Airlines

8.0

Very Good

9,871 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Delta

8.0

Very Good

7,917 reviews

Alaska Airlines

8.0

Very Good

9,871 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Air New Zealand

8.0

Very Good

464 reviews

Alaska Airlines

8.0

Very Good

9,871 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Qantas Airways

7.5

Good

818 reviews

Alaska Airlines

8.0

Very Good

9,871 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

What are the cheapest airlines flying from St. Louis to Sydney round-trip?
Our cheapest airline available from St. Louis to Sydney is Air Canada. Our recent data shows that you can find tickets from as low as $1,973 on this airline. Additional options worth looking into are American Airlines and Qantas Airways, starting at $2,286 and $2,293 round-trip. Air Canada is 18% 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 American Airlines, with whom users have recently found tickets for as low as $1,309. 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

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Manly

Penrith

Coogee

Randwick

Terrigal

Cronulla

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Bondi Beach

Leura

Swansea

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Alternative routes for St. Louis to Sydney

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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.

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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.

Cheap flights from St. Louis to Sydney from $1,043

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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from St. Louis to Sydney

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from St. Louis to Sydney

Cheapest flights from St. Louis to SydneyExplore 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 15 April 2025.

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 15 April 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Sydney that are best for you.

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.

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 11 April 2025.

What is the cheapest month to book a flight from St. Louis to Sydney?

Rainfall in Sydney by month

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

Temperature in Sydney by month

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

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 15 April 2025.

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?

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

Can I find deals for flights from St. Louis to Sydney that include hotel bookings?

How can I find direct flights from St. Louis to Sydney?

Can I find deals for business class flights from St. Louis to Sydney?

What is the cheapest month to book a flight from St. Louis to Sydney?

Travelling to a place near St. Louis?

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.

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?

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

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

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

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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 15 April 2025.