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

According to our current data, Air Canada ($899), Qantas Airways ($1,071), and American Airlines ($1,156) offers the cheapest pricing from St. Louis to Sydney. Air Canada is priced at 38% lower than the current average price of a flight leaving 3 months from now.

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

Travelers seeking maximum savings on their St. Louis to Sydney flight should consider departing on Monday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 American Airlines, Air Canada or Fiji Airways when booking your flight. These represent the most popular airlines when flying from St. Louis to Sydney.

What is the cheapest day to fly round-trip from St. Louis to Sydney?

It’s generally more expensive to depart on a Tuesday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

Find a great deal and save up to 135% by booking at least 58 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to Sydney within the next two weeks, with the cheapest ticket starting at $1,193.

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

Flights from St. Louis to Sydney lean towards being more expensive in December. Prices are generally better when you fly from St. Louis to Sydney in August, with the cheapest ticket starting at $716.

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.

$815+ 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 $956 and $1,381 in December. The cheapest round-trip price found within the last 3 days was $899 on Air Canada (Dec 1-Feb 1).

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1. Tell us where you want to go

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2. Select your favorite providers

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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

Round-trip from	$899 (Air Canada)
One-way from	$815 (Ovago)
Popular in	December
Cheapest in	August
Average price	$1,392

From Lambert-St Louis to Sydney Kingsford Smith

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

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Highest demand for flights based on searches. 6% potential increase in price ($104 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($36 potential savings vs. average RT price).

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Average for round-trip flights in July 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 July 30, 2025.

Mon 12/14:05 pmSTL - SYD

2 stops45h 50mAir Canada

Sun 2/111:20 amSYD - STL

2 stops45h 09mAir Canada

Deal found 7/29

$899

Wed 10/294:55 pmSTL - SYD

2 stops23h 40mMultiple Airlines

Sat 11/1511:20 amSYD - STL

2 stops45h 09mMultiple Airlines

Deal found 7/29

$970

Mon 11/177:00 amSTL - SYD

2 stops33h 50mQantas Airways

Sat 2/282:20 pmSYD - STL

1 stop20h 59mQantas Airways

Deal found 7/28

$1,070

Fri 9/126:20 amSTL - SYD

1 stop33h 45mAmerican Airlines

Fri 9/199:10 amSYD - STL

2 stops22h 00mAmerican Airlines

Deal found 7/29

$1,156

Fri 11/286:15 amSTL - SYD

2 stops35h 15mAir New Zealand

Sun 12/1411:45 amSYD - STL

2 stops27h 13mAir New Zealand

Deal found 7/30

$1,263

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 July 30, 2025.

Mon 12/14:05 pmSTL - SYD

2 stops45h 50mAir Canada

Sun 2/111:20 amSYD - STL

2 stops45h 09mAir Canada

Deal found 7/29

$899

Wed 10/294:55 pmSTL - SYD

2 stops23h 40mMultiple Airlines

Sat 11/1511:20 amSYD - STL

2 stops45h 09mMultiple Airlines

Deal found 7/29

$970

Mon 11/177:00 amSTL - SYD

2 stops33h 50mQantas Airways

Sat 2/282:20 pmSYD - STL

1 stop20h 59mQantas Airways

Deal found 7/28

$1,070

Fri 9/122:01 pmSTL - SYD

2 stops26h 04mAmerican Airlines

Fri 9/199:10 amSYD - STL

2 stops22h 00mAmerican Airlines

Deal found 7/29

$1,156

Fri 11/286:15 amSTL - SYD

2 stops35h 15mAir New Zealand

Sun 12/1411:45 amSYD - STL

2 stops27h 13mAir New Zealand

Deal found 7/30

$1,263

Last-minute flights from St. Louis to Sydney
Discover last-minute flight deals from St. Louis to Sydney. Data last updated July 30, 2025 and is based on user searches.

Wed 7/308:00 amSTL - SYD

2 stops31h 55mUnited Airlines

Wed 8/610:20 amSYD - STL

1 stop21h 25mUnited Airlines

Deal found 7/29

$1,366

Sat 8/239:23 amSTL - SYD

1 stop30h 32mAmerican Airlines

Mon 9/15:45 pmSYD - STL

1 stop20h 24mAmerican Airlines

Deal found 7/29

$1,346

Sun 8/247:41 pmSTL - SYD

1 stop20h 14mQantas Airways

Sun 8/319:10 amSYD - STL

1 stop28h 59mQantas Airways

Deal found 7/28

$1,331

Sun 8/319:15 amSTL - SYD

2 stops31h 05mAir Canada

Thu 9/189:20 amSYD - STL

2 stops49h 37mAir Canada

Deal found 7/30

$955

Sun 8/315:32 pmSTL - SYD

1 stop22h 23mMultiple Airlines

Thu 9/189:20 amSYD - STL

2 stops49h 37mMultiple Airlines

Deal found 7/30

$1,271

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 July 30, 2025.

Thu 1/155:54 pmSTL - SYD

2 stops34h 56mFiji Airways

Deal found 7/30

$815

Thu 1/157:05 amSTL - SYD

1 stop30h 15mUnited Airlines

Deal found 7/30

$954

Thu 1/151:30 pmSTL - SYD

3 stops26h 15mMultiple Airlines

Deal found 7/30

$1,371

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 12/1

4:05 pm-6:55 am

2 stops45h 50m

Sydney Kingsford Smith

Sun 2/1

11:20 am-3:29 pm

2 stops45h 09m

$899

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 10/29

4:55 pm-8:35 am

2 stops23h 40m

Sydney Kingsford Smith

Sat 11/15

11:20 am-3:29 pm

2 stops45h 09m

$970

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 11/17

7:00 am-9:50 am

2 stops33h 50m

Sydney Kingsford Smith

Sat 2/28

2:20 pm-6:19 pm

1 stop20h 59m

$1,070

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 9/12

2:01 pm-7:05 am

2 stops26h 04m

Sydney Kingsford Smith

Fri 9/19

9:10 am-4:10 pm

2 stops22h 00m

$1,156

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/28

6:15 am-10:30 am

2 stops35h 15m

Sydney Kingsford Smith

Sun 12/14

11:45 am-9:58 pm

2 stops27h 13m

$1,263

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 1/15

5:54 pm-9:50 pm

2 stops34h 56m

$815

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 1/15

7:05 am-6:20 am

1 stop30h 15m

$954

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 1/15

1:30 pm-8:45 am

3 stops26h 15m

$1,371

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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, February is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,028). Flying from St. Louis to Sydney in December is currently the most expensive (average of $1,619). 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 24% 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, Air New Zealand, and Qantas Airways 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

8.0

Very good

202 reviews

Reviews

1 / 16

6.0

Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

Fiji Airways

8.0

Very good

202 reviews

Fiji Airways

8.0

Very good

202 reviews

Reviews

1 / 16

6.0

Good

Christopher,Jun 2025

LAX - NAN

Air New Zealand

8.0

Very good

501 reviews

Fiji Airways

8.0

Very good

202 reviews

Reviews

1 / 16

6.0

Good

Christopher,Jun 2025

LAX - NAN

Qantas Airways

7.5

Good

887 reviews

Fiji Airways

8.0

Very good

202 reviews

Reviews

1 / 16

6.0

Good

Christopher,Jun 2025

LAX - NAN

United Airlines

7.4

Good

8,896 reviews

Fiji Airways

8.0

Very good

202 reviews

Reviews

1 / 16

6.0

Good

Christopher,Jun 2025

LAX - NAN

American Airlines

7.2

Good

10,000 reviews

Fiji Airways

8.0

Very good

202 reviews

Reviews

1 / 16

6.0

Good

Christopher,Jun 2025

LAX - NAN

Related info for your journey

What are the cheapest airlines flying from St. Louis to Sydney round-trip?
According to our current data, Air Canada ($899), Qantas Airways ($1,071), and American Airlines ($1,156) offers the cheapest pricing from St. Louis to Sydney. Air Canada is priced at 38% 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, February is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,028). Flying from St. Louis to Sydney in December is currently the most expensive (average of $1,619). 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 6 airlines flying from St. Louis to Sydney

Airline	Cheapest	Average	Flexibility	On-time
Fiji Airways	Cheapest$887	Average$1,222	FlexibilityNo cancel fee	On-time74%
Air Canada	Cheapest$912	Average$1,339	FlexibilityNo cancel fee	On-time67%
Air New Zealand	Cheapest$1,173	Average$1,873	FlexibilityNo cancel fee	On-time78%
American Airlines	Cheapest$1,193	Average$1,446	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$1,204	Average$1,507	FlexibilityNo cancel fee	On-time69%
Qantas Airways	Cheapest$1,260	Average$1,496	FlexibilityNo cancel fee	On-time74%

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$815+ 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 1/15. 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

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 July 30, 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 July 30, 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 round-trip flight from St. Louis to Sydney. Price data was last updated on July 25, 2025.

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?

Find hourly flight availability from St. Louis to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

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

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 July 30, 2025.

Get a feel of what it's like to fly with Fiji Airways, Air New Zealand, and Qantas Airways 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.

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?

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Alternative routes for St. Louis to Sydney

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Top 6 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 July 30, 2025.