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

Our cheapest airline available from Sydney to St. Louis is United Airlines. Our recent data shows that you can find tickets from as low as $1,129 on this airline. Additional options worth looking into are Delta and Qantas Airways, starting at $1,146 and $1,279 round-trip. Users have found that United Airlines 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.

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 $1,424. 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 August.

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.

$1,129+ Flights from Sydney to St. Louis

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Cheap flight deals from Sydney to St. Louis

Round-trip from	$1,129 (United Airlines)
Popular in	August
Cheapest in	November
Average price	$1,211

From Sydney Kingsford Smith to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($158 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($60 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in June 2025

Search Deals

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 June 12, 2025.

Mon 8/189:30 amSYD - STL

2 stops22h 01mUnited Airlines

Sat 11/84:35 pmSTL - SYD

1 stop21h 25mUnited Airlines

Deal found 6/11

$1,129

Sun 6/229:25 amSYD - STL

2 stops37h 58mDelta

Sun 6/296:30 amSTL - SYD

2 stops33h 05mDelta

Deal found 6/11

$1,146

Fri 7/185:45 pmSYD - STL

1 stop20h 45mQantas Airways

Thu 7/316:14 amSTL - SYD

1 stop33h 51mQantas Airways

Deal found 6/12

$1,279

Sat 7/261:45 pmSYD - STL

3 stops35h 07mMultiple Airlines

Sat 8/27:38 pmSTL - SYD

2 stops25h 07mMultiple Airlines

Deal found 6/10

$1,282

Fri 7/1810:25 amSYD - STL

2 stops23h 43mAmerican Airlines

Thu 7/316:14 amSTL - SYD

1 stop33h 51mAmerican Airlines

Deal found 6/12

$1,306

Sun 6/228:55 amSYD - STL

2 stops53h 04mJapan Airlines

Sun 6/298:35 amSTL - SYD

2 stops54h 45mJapan Airlines

Deal found 6/10

$1,388

Sat 7/269:20 amSYD - STL

3 stops50h 30mAir Canada

Sat 8/24:00 pmSTL - SYD

2 stops48h 20mAir Canada

Deal found 6/10

$1,428

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

Mon 8/189:30 amSYD - STL

2 stops22h 01mUnited Airlines

Sat 11/84:35 pmSTL - SYD

1 stop21h 25mUnited Airlines

Deal found 6/11

$1,129

Sun 6/229:25 amSYD - STL

2 stops37h 58mDelta

Sun 6/296:30 amSTL - SYD

2 stops33h 05mDelta

Deal found 6/11

$1,146

Fri 7/185:45 pmSYD - STL

1 stop20h 45mQantas Airways

Thu 7/316:14 amSTL - SYD

1 stop33h 51mQantas Airways

Deal found 6/12

$1,279

Sat 7/261:45 pmSYD - STL

3 stops35h 07mMultiple Airlines

Sat 8/27:38 pmSTL - SYD

2 stops25h 07mMultiple Airlines

Deal found 6/10

$1,282

Fri 7/1810:25 amSYD - STL

2 stops23h 43mAmerican Airlines

Thu 7/316:14 amSTL - SYD

1 stop33h 51mAmerican Airlines

Deal found 6/12

$1,306

Sun 6/228:55 amSYD - STL

2 stops53h 04mJapan Airlines

Sun 6/298:35 amSTL - SYD

2 stops54h 45mJapan Airlines

Deal found 6/10

$1,388

Sat 7/269:20 amSYD - STL

3 stops50h 30mAir Canada

Sat 8/24:00 pmSTL - SYD

2 stops48h 20mAir Canada

Deal found 6/10

$1,428

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

Sun 6/229:25 amSYD - STL

2 stops37h 58mDelta

Sun 6/296:30 amSTL - SYD

2 stops33h 05mDelta

Deal found 6/11

$1,146

Sun 6/228:55 amSYD - STL

2 stops53h 04mJapan Airlines

Sun 6/298:35 amSTL - SYD

2 stops54h 45mJapan Airlines

Deal found 6/10

$1,388

Sun 6/229:30 amSYD - STL

2 stops27h 45mUnited Airlines

Sun 6/295:51 pmSTL - SYD

1 stop22h 04mUnited Airlines

Deal found 6/10

$1,583

Sun 6/228:55 amSYD - STL

2 stops53h 04mMultiple Airlines

Sun 6/296:28 amSTL - SYD

1 stop33h 37mMultiple Airlines

Deal found 6/9

$1,642

Sun 6/229:10 amSYD - STL

1 stop28h 49mAmerican Airlines

Sun 6/296:28 amSTL - SYD

1 stop33h 37mAmerican Airlines

Deal found 6/10

$1,913

Fri 7/185:45 pmSYD - STL

1 stop20h 45mQantas Airways

Thu 7/316:14 amSTL - SYD

1 stop33h 51mQantas Airways

Deal found 6/12

$1,279

Fri 7/1810:25 amSYD - STL

2 stops23h 43mAmerican Airlines

Thu 7/316:14 amSTL - SYD

1 stop33h 51mAmerican Airlines

Deal found 6/12

$1,306

Sat 7/261:45 pmSYD - STL

3 stops35h 07mMultiple Airlines

Sat 8/27:38 pmSTL - SYD

2 stops25h 07mMultiple Airlines

Deal found 6/10

$1,282

Sat 7/269:20 amSYD - STL

3 stops50h 30mAir Canada

Sat 8/24:00 pmSTL - SYD

2 stops48h 20mAir Canada

Deal found 6/10

$1,428

Sun 7/2710:20 amSYD - STL

1 stop33h 34mUnited Airlines

Sun 8/34:45 pmSTL - SYD

2 stops23h 15mUnited Airlines

Deal found 6/11

$1,395

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

10:20 am-4:45 pm

1 stop21h 25m

Lambert-St Louis

Sat 11/8

11:10 am-7:00 am

1 stop26h 50m

$1,129

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 6/22

9:25 am-8:23 am

2 stops37h 58m

Lambert-St Louis

Sun 6/29

6:30 am-6:35 am

2 stops33h 05m

$1,146

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/18

5:45 pm-11:30 pm

1 stop20h 45m

Lambert-St Louis

Thu 7/31

6:14 am-7:05 am

1 stop33h 51m

$1,279

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 7/26

1:45 pm-9:52 am

3 stops35h 07m

Lambert-St Louis

Sat 8/2

7:38 pm-11:45 am

2 stops25h 07m

$1,282

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/18

10:25 am-7:08 pm

2 stops23h 43m

Lambert-St Louis

Thu 7/31

6:14 am-7:05 am

1 stop33h 51m

$1,306

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 6/22

8:55 am-10:59 pm

2 stops53h 04m

Lambert-St Louis

Sun 6/29

8:35 am-6:20 am

2 stops54h 45m

$1,388

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 7/26

9:20 am-8:50 pm

3 stops50h 30m

Lambert-St Louis

Sat 8/2

4:00 pm-7:20 am

2 stops48h 20m

$1,428

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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.

Rainfall in St. Louis by month

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.

Temperature in St. Louis by month

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).

Reviews of airlines servicing St. Louis

See what other customers who have flown with Japan Airlines, Delta and Qantas Airways from Sydney to St. Louis have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Japan Airlines

8.3

Very good

1,490 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.

Japan Airlines

8.3

Very good

1,490 reviews

Japan Airlines

8.3

Very good

1,490 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.

Delta

8.0

Very good

7,946 reviews

Japan Airlines

8.3

Very good

1,490 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.

Qantas Airways

7.5

Good

854 reviews

Japan Airlines

8.3

Very good

1,490 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.

United Airlines

7.4

Good

8,790 reviews

Japan Airlines

8.3

Very good

1,490 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.

American Airlines

7.2

Good

10,000 reviews

Japan Airlines

8.3

Very good

1,490 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.

Related info for your journey

What are the cheapest airlines flying from Sydney to St. Louis round-trip?
Our cheapest airline available from Sydney to St. Louis is United Airlines. Our recent data shows that you can find tickets from as low as $1,129 on this airline. Additional options worth looking into are Delta and Qantas Airways, starting at $1,146 and $1,279 round-trip. Users have found that United Airlines 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

O'Fallon

Maryland Heights

Fairview Heights

Collinsville

Eureka

St. Peters

Glencoe

Festus

Alton

Farmington

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Sydney to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Qantas Airways	Cheapest$1,101	Average$1,192	FlexibilityNo cancel fee	On-time74%

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$1,129+ 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

Round-trip from

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 June 12, 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 June 12, 2025.

Cheapflights Fare Finder

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

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?

Rainfall in St. Louis by month

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

Temperature in St. Louis by month

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

Reviews of airlines servicing St. Louis

See what other customers who have flown with Japan Airlines, Delta and Qantas Airways from Sydney to St. Louis have to say. 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 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 are the cheapest airlines flying 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 Sydney?

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 Sydney to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

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 June 12, 2025.