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

Our cheapest airline available from Sydney to St. Louis is Qantas Airways. Our recent data shows that you can find tickets from as low as $1,110 on this airline. Users have found that Qantas Airways is 20% cheaper than the other options available to this destination.

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

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

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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

Friday flights are found to be more expensive to fly from Sydney to St. Louis. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to St. Louis.

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

November can be a great time to fly to St. Louis from Sydney with a flight ticket averaging about $1,389. Cheapflights users have found deals in the month of November for as cheap as $1,065. The most expensive prices can be found in the month of December.

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

It’s optimal to fly from Sydney to St. Louis in the morning. By choosing this option you can save up to 26% on the cost of your flight, compared to a flight at noon.

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

Yes. In addition to deals on Sydney to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

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

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to St. Louis.

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

Yes. Cheapflights offers flight deals from Sydney to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$818+ Cheap Flights from Sydney to St. Louis

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Cheap flight deals from Sydney to St. Louis

Popular in	December
Cheapest in	November
Average price	$1,388

Highest demand for flights based on searches. 0% potential increase in price ($6 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($21 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Find flight deals from Sydney to St. Louis

Cheapest flights from Sydney to St. Louis
Explore the most affordable flight options available from Sydney to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Mon 8/189:10 amSYD - STL

2 stops26h 08mAmerican Airlines

Sat 11/811:39 amSTL - SYD

2 stops28h 21mAmerican Airlines

Deal found 8/12

$818

Mon 8/1810:20 amSYD - STL

1 stop21h 25mUnited Airlines

Sat 11/811:20 amSTL - SYD

1 stop26h 40mUnited Airlines

Deal found 8/12

$835

Mon 8/189:55 amSYD - STL

3 stops29h 04mMultiple Airlines

Sat 11/89:00 amSTL - SYD

3 stops30h 45mMultiple Airlines

Deal found 8/12

$1,634

Last-minute flights from Sydney to St. Louis
Discover last-minute flight deals from Sydney to St. Louis. Data last updated August 14, 2025 and is based on user searches.

Mon 8/189:10 amSYD - STL

1 stop28h 59mAmerican Airlines

Sat 11/811:39 amSTL - SYD

2 stops28h 21mAmerican Airlines

Deal found 8/12

$818

Mon 8/1810:20 amSYD - STL

1 stop21h 25mUnited Airlines

Sat 11/811:20 amSTL - SYD

1 stop26h 40mUnited Airlines

Deal found 8/12

$835

Mon 8/189:55 amSYD - STL

3 stops29h 04mMultiple Airlines

Sat 11/89:00 amSTL - SYD

3 stops30h 45mMultiple Airlines

Deal found 8/12

$1,634

Best time to book a flight from Sydney to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Sydney 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 Sydney to St. Louis

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

Currently, August is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $311). Flying from Sydney to St. Louis in March is currently the most expensive (average of $356). 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.

Reviews of airlines servicing St. Louis

Read reviews from past customers who have flown Qantas Airways from Sydney to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Qantas Airways

7.5

Good

895 reviews

Reviews

1 / 20

2.0

Mediocre

Anonymous,Jul 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.

Qantas Airways

7.5

Good

895 reviews

Qantas Airways

7.5

Good

895 reviews

Reviews

1 / 20

2.0

Mediocre

Anonymous,Jul 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.

Related info for your journey

What is the cheapest airline to fly from Sydney to St. Louis round-trip?
Our cheapest airline available from Sydney to St. Louis is Qantas Airways. Our recent data shows that you can find tickets from as low as $1,110 on this airline. Users have found that Qantas Airways is 20% cheaper than the other options available to this destination.
Can I find deals for flights from Sydney to St. Louis that include hotel bookings?
Yes. In addition to deals on Sydney to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Sydney to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to St. Louis.
Can I find deals for business class flights from Sydney to St. Louis?
Yes. Cheapflights offers flight deals from Sydney to St. Louis 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 Sydney to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $311). Flying from Sydney to St. Louis in March is currently the most expensive (average of $356). 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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Top airline flying from Sydney to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Qantas Airways	Cheapest$1,110	Average$1,789	FlexibilityNo cancel fee	On-time74%

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$818+ Cheap flights from Sydney (SYD) to St. Louis (STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Sydney to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Sydney to St. Louis

Popular in

Cheapest in

Average price

Find flight deals from Sydney to St. Louis

Cheapest flights from Sydney to St. LouisExplore the most affordable flight options available from Sydney to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Explore the most affordable flight options available from Sydney to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Best time to book a flight from Sydney to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Sydney with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Sydney to St. Louis

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

Reviews of airlines servicing St. Louis

Read reviews from past customers who have flown Qantas Airways from Sydney to St. Louis. Users can see the overall rating for each airline as well as how each is rated 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 Sydney to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

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

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

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

Traveling to a place near St. Louis?

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Alternative routes for Sydney to St. Louis

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Top airline flying from Sydney to St. Louis

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Travel Smart

Cheapest flights from Sydney to St. Louis
Explore the most affordable flight options available from Sydney to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.