How long is the flight from St. Louis to Sydney?

There are many flights that can get you from St. Louis to Sydney in 32h. Fly via Qantas Airways or United Airlines to get the fastest option. The distance between St. Louis and Sydney is about 9054 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

According to our current data, Air Canada ($608), Fiji Airways ($1,132), and Qantas Airways ($1,237) offers the cheapest pricing from St. Louis to Sydney. Air Canada is priced at 58% lower than the current average price of a flight leaving 3 months from now.

In terms of precipitation, rainfall in Sydney ranges from 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Sydney when rainfall is around 2.0 in.

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 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

What are the most popular airlines that fly from St. Louis to Sydney?

Consider United Airlines, Qantas Airways or American Airlines when booking your flight. These represent the most popular airlines when flying from St. Louis to Sydney.

Most accurate provider : When it comes to deals on St. Louis-Sydney flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Sydney flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Sydney flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on St. Louis-Sydney flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 vacation 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.

$672+ Flights from St. Louis to Sydney

Q: How much does it cost to fly round-trip from St. Louis to Sydney?

Airfare is below average for this route at the moment. St. Louis to Sydney flights typically cost between $1,340 and $1,975 in January. The cheapest round-trip price found within the last 3 days was $992 on Qantas Airways (Jan 25-Feb 1).

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

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Cheapflights Tip: The best prices from Lambert-St Louis to Sydney Kingsford Smith are usually found in August or October, booked 57 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap 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 December 12, 2025.

Fri 12/125:30 pmSTL - SYD

2 stops24h 25mQantas Airways

Thu 12/188:10 pmSYD - STL

2 stops40h 20mQantas Airways

Deal found 12/11

$1,361

Fri 12/125:30 pmSTL - SYD

2 stops24h 25mQantas Airways

Fri 12/196:05 amSYD - STL

2 stops28h 05mQantas Airways

Deal found 12/11

$1,471

Sun 12/1411:10 amSTL - SYD

1 stop26h 50mUnited Airlines

Tue 12/161:00 pmSYD - STL

2 stops44h 27mUnited Airlines

Deal found 12/10

$1,592

Fri 12/125:30 pmSTL - SYD

1 stop22h 45mUnited Airlines

Thu 12/1811:50 amSYD - STL

1 stop21h 46mUnited Airlines

Deal found 12/11

$2,214

Sat 12/2710:30 amSTL - SYD

2 stops29h 45mUnited Airlines

Fri 1/911:20 amSYD - STL

2 stops28h 38mUnited Airlines

Deal found 12/10

$2,218

Best flights from St. Louis to Sydney
Discover carefully curated flight deals from St. Louis to Sydney that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

Fri 2/67:04 amSTL - SYD

2 stops36h 56mQantas Airways

Tue 2/102:05 pmSYD - STL

1 stop19h 09mQantas Airways

Deal found 12/9

$1,103

Sun 1/256:00 amSTL - SYD

1 stop32h 00mUnited Airlines

Mon 2/211:50 amSYD - STL

1 stop27h 10mUnited Airlines

Deal found 12/10

$1,163

Wed 1/283:31 pmSTL - SYD

2 stops23h 59mDelta

Thu 2/510:40 amSYD - STL

2 stops23h 05mDelta

Deal found 12/10

$1,218

Tue 1/274:35 pmSTL - SYD

1 stop21h 25mUnited Airlines

Wed 2/411:20 amSYD - STL

2 stops22h 35mUnited Airlines

Deal found 12/10

$1,167

Mon 1/267:04 amSTL - SYD

2 stops39h 26mQantas Airways

Thu 2/55:45 pmSYD - STL

1 stop23h 14mQantas Airways

Deal found 12/10

$1,258

Thu 1/293:31 pmSTL - SYD

2 stops23h 59mDelta

Sat 2/72:15 pmSYD - STL

2 stops26h 10mDelta

Deal found 12/10

$1,268

Sun 1/256:00 amSTL - SYD

1 stop32h 00mUnited Airlines

Tue 2/312:10 pmSYD - STL

2 stops22h 33mUnited Airlines

Deal found 12/10

$1,167

Wed 1/287:04 amSTL - SYD

2 stops36h 11mQantas Airways

Thu 2/55:45 pmSYD - STL

1 stop23h 14mQantas Airways

Deal found 12/10

$1,258

Mon 1/266:45 amSTL - SYD

1 stop30h 35mUnited Airlines

Fri 2/612:10 pmSYD - STL

1 stop20h 27mUnited Airlines

Deal found 12/10

$1,213

Mon 1/267:04 amSTL - SYD

2 stops40h 46mQantas Airways

Fri 2/62:05 pmSYD - STL

1 stop19h 09mQantas Airways

Deal found 12/10

$1,258

Mon 1/266:45 amSTL - SYD

1 stop30h 35mUnited Airlines

Sat 2/712:10 pmSYD - STL

1 stop20h 27mUnited Airlines

Deal found 12/10

$1,213

Thu 1/296:00 amSTL - SYD

1 stop32h 00mUnited Airlines

Sat 2/711:50 amSYD - STL

1 stop20h 49mUnited Airlines

Deal found 12/10

$1,263

Last-minute flights from St. Louis to Sydney
Discover last-minute flight deals from St. Louis to Sydney. Data last updated December 12, 2025 and is based on user searches.

Sun 1/257:04 amSTL - SYD

2 stops55h 31mQantas Airways

Sun 2/15:45 pmSYD - STL

1 stop23h 14mQantas Airways

Deal found 12/11

$992

Sun 1/256:00 pmSTL - SYD

2 stops46h 35mAir Canada

Sun 2/111:20 amSYD - STL

2 stops50h 38mAir Canada

Deal found 12/11

$1,129

Sun 1/256:00 pmSTL - SYD

2 stops46h 35mAir Canada

Tue 2/311:20 amSYD - STL

2 stops26h 38mAir Canada

Deal found 12/10

$1,145

Sun 1/256:00 amSTL - SYD

1 stop32h 00mUnited Airlines

Sun 2/112:10 pmSYD - STL

1 stop20h 27mUnited Airlines

Deal found 12/10

$1,163

Sun 1/256:00 amSTL - SYD

1 stop32h 00mUnited Airlines

Mon 2/22:00 pmSYD - STL

2 stops23h 58mUnited Airlines

Deal found 12/10

$1,167

Sun 1/256:00 pmSTL - SYD

2 stops46h 35mAir Canada

Fri 2/611:20 amSYD - STL

2 stops26h 38mAir Canada

Deal found 12/10

$1,195

Sun 1/256:00 amSTL - SYD

1 stop32h 00mUnited Airlines

Sat 2/711:50 amSYD - STL

1 stop20h 49mUnited Airlines

Deal found 12/10

$1,213

Mon 1/264:05 pmSTL - SYD

2 stops48h 30mAir Canada

Sun 2/111:20 amSYD - STL

2 stops45h 09mAir Canada

Deal found 12/10

$1,136

Mon 1/264:05 pmSTL - SYD

2 stops48h 30mAir Canada

Sat 2/711:20 amSYD - STL

2 stops45h 09mAir Canada

Deal found 12/10

$1,186

Mon 1/264:05 pmSTL - SYD

2 stops48h 30mAir Canada

Thu 2/511:20 amSYD - STL

2 stops26h 38mAir Canada

Deal found 12/10

$1,190

Fri 1/308:45 amSTL - SYD

2 stops55h 50mAir Canada

Tue 2/311:20 amSYD - STL

2 stops26h 38mAir Canada

Deal found 12/10

$1,196

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 December 12, 2025.

Mon 3/24:05 pmSTL - SYD

2 stops48h 30mAir Canada

Deal found 12/11

$672

Thu 3/52:47 pmSTL - SYD

3 stops46h 23mMultiple Airlines

Deal found 12/10

$734

Mon 3/24:39 pmSTL - SYD

1 stop21h 21mUnited Airlines

Deal found 12/10

$763

Thu 3/56:30 amSTL - SYD

1 stop33h 30mQantas Airways

Deal found 12/10

$923

Mon 3/28:41 amSTL - SYD

3 stops31h 04mMultiple Airlines

Deal found 12/10

$1,038

Find flight deals from St. Louis to Sydney

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$992 (oojo)
One-way from	$672 (Air Canada)
Popular in	December
Cheapest in	August
Average price	$1,766

Provider with most accurate pricing for Lambert-St Louis-Sydney Kingsford Smith flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Sydney Kingsford Smith flights.

Search Deals

From Lambert-St Louis to Sydney Kingsford Smith

Search Deals

One-way flight from Lambert-St Louis to Sydney Kingsford Smith

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($76 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($28 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 2/6

7:04 am-1:00 pm

2 stops36h 56m

Sydney Kingsford Smith

Tue 2/10

2:05 pm-4:14 pm

1 stop19h 09m

$1,103

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/25

6:00 am-7:00 am

1 stop32h 00m

Sydney Kingsford Smith

Mon 2/2

11:50 am-10:00 pm

1 stop27h 10m

$1,163

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 1/27

4:35 pm-7:00 am

1 stop21h 25m

Sydney Kingsford Smith

Wed 2/4

11:20 am-4:55 pm

2 stops22h 35m

$1,167

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/25

6:00 am-7:00 am

1 stop32h 00m

Sydney Kingsford Smith

Tue 2/3

12:10 pm-5:43 pm

2 stops22h 33m

$1,167

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/26

6:45 am-6:20 am

1 stop30h 35m

Sydney Kingsford Smith

Fri 2/6

12:10 pm-3:37 pm

1 stop20h 27m

$1,213

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/26

6:45 am-6:20 am

1 stop30h 35m

Sydney Kingsford Smith

Sat 2/7

12:10 pm-3:37 pm

1 stop20h 27m

$1,213

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 1/28

3:31 pm-8:30 am

2 stops23h 59m

Sydney Kingsford Smith

Thu 2/5

10:40 am-4:45 pm

2 stops23h 05m

$1,218

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/26

7:04 am-3:30 pm

2 stops39h 26m

Sydney Kingsford Smith

Thu 2/5

5:45 pm-11:59 pm

1 stop23h 14m

$1,258

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 1/28

7:04 am-12:15 pm

2 stops36h 11m

Sydney Kingsford Smith

Thu 2/5

5:45 pm-11:59 pm

1 stop23h 14m

$1,258

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/26

7:04 am-4:50 pm

2 stops40h 46m

Sydney Kingsford Smith

Fri 2/6

2:05 pm-4:14 pm

1 stop19h 09m

$1,258

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 16 results

Compare providers for flights from St. Louis to Sydney

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Sydney in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
AranGrant	Price Accuracy2 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
oojo	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on St. Louis-Sydney flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Sydney flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Sydney flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on St. Louis-Sydney flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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?

The best time to book flights from St. Louis to Sydney is 57 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 $705). Flying from St. Louis to Sydney in March is currently the most expensive (average of $1,285). 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.

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

It’s optimal to fly from St. Louis to Sydney in the evening. By choosing this option you can save up to 23% on the cost of your flight, compared to a flight at noon.

How much does it cost to fly round-trip from St. Louis to Sydney?

Reviews of airlines servicing Sydney

Get a feel of what it's like to fly with Fiji Airways, Qantas Airways, and United Airlines from St. Louis to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Fiji Airways

8.1

Very good

210 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

Fiji Airways

8.1

Very good

210 reviews

Fiji Airways

8.1

Very good

210 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

Qantas Airways

7.5

Good

947 reviews

Fiji Airways

8.1

Very good

210 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

United Airlines

7.4

Good

9,095 reviews

Fiji Airways

8.1

Very good

210 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

American Airlines

7.2

Good

11,050 reviews

Fiji Airways

8.1

Very good

210 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

Air Canada

7.1

Good

10,516 reviews

Fiji Airways

8.1

Very good

210 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

Related info for your journey

How long is the flight from St. Louis to Sydney?
There are many flights that can get you from St. Louis to Sydney in 32h. Fly via Qantas Airways or United Airlines to get the fastest option. The distance between St. Louis and Sydney is about 9054 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines flying from St. Louis to Sydney round-trip?
According to our current data, Air Canada ($608), Fiji Airways ($1,132), and Qantas Airways ($1,237) offers the cheapest pricing from St. Louis to Sydney. Air Canada is priced at 58% lower than the current average price of a flight leaving 3 months from now.
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 vacation 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 $705). Flying from St. Louis to Sydney in March is currently the most expensive (average of $1,285). 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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Other flights to Sydney

Top 5 airlines flying from St. Louis to Sydney

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$897	Average$1,260	FlexibilityNo cancel fee	On-time67%
Fiji Airways	Cheapest$1,132	Average$1,222	FlexibilityNo cancel fee	On-time74%
Qantas Airways	Cheapest$1,237	Average$1,450	FlexibilityNo cancel fee	On-time74%
American Airlines	Cheapest$1,340	Average$1,495	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$1,357	Average$1,511	FlexibilityNo cancel fee	On-time69%

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$672+ Cheap flights from St. Louis (STL) to Sydney (SYD)

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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Sydney with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to Sydney Kingsford Smith are usually found in August or October, booked 57 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap 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 December 12, 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 December 12, 2025.

Find flight deals from St. Louis to Sydney

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Compare providers for flights from St. Louis to Sydney

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Sydney in December.

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?

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

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

How much does it cost to fly round-trip from St. Louis to Sydney?

Reviews of airlines servicing Sydney

Get a feel of what it's like to fly with Fiji Airways, Qantas Airways, and United Airlines from St. Louis to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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?

Traveling to a place near Sydney?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Sydney

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Top 5 airlines flying from St. Louis to Sydney

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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 December 12, 2025.