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Cheap flights from Sydney to St. Louis from $909

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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
22 Jan — 29 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Sydney to St. Louis

Enter your travel dates to find the best prices.

Best flights from Sydney to St. Louis
Discover carefully curated flight deals from Sydney to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 December 2025.

Tue 3/211:20SYD - STL
2 stops44h 55mMultiple Airlines
Tue 10/216:15STL - SYD
2 stops24h 20mMultiple Airlines
Deal found 20/12$1,596
Wed 1/410:20SYD - STL
2 stops22h 36mAir Canada
Mon 6/414:40STL - SYD
2 stops25h 40mAir Canada
Deal found 22/12$1,647
Sat 7/317:30SYD - STL
2 stops23h 18mQantas Airways
Mon 9/306:38STL - SYD
1 stop34h 22mQantas Airways
Deal found 19/12$2,328
Tue 3/211:20SYD - STL
1 stop29h 39mAmerican Airlines
Tue 10/207:04STL - SYD
1 stop32h 56mAmerican Airlines
Deal found 20/12$2,335
Wed 1/410:20SYD - STL
2 stops22h 36mMultiple Airlines
Mon 6/416:05STL - SYD
2 stops48h 15mMultiple Airlines
Deal found 21/12$1,605
Wed 4/214:05SYD - STL
1 stop19h 09mMultiple Airlines
Wed 11/211:55STL - SYD
2 stops27h 05mMultiple Airlines
Deal found 20/12$2,067
Wed 4/211:20SYD - STL
3 stops28h 38mAir Canada
Wed 11/214:45STL - SYD
2 stops25h 50mAir Canada
Deal found 20/12$2,300
Sat 7/311:20SYD - STL
3 stops28h 39mAir Canada
Mon 9/307:40STL - SYD
3 stops32h 55mAir Canada
Deal found 19/12$2,495

Find flight deals from Sydney to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Sydney (SYD) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 23 December 2025.

Round-trip from

$1,605

One-way from

$909

Popular in

May

Cheapest in

August

Average price

$2,419
Air Canada
  • Air Canada
  • 1/4-5/4
  • 4 total stops
  • 70h 51m total
  • Sydney to St. Louis
Search Deals
5/2
  • 5/2
  • 3 total stops
  • 54h 03m total
  • Sydney to St. Louis
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($77 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($60 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Sydney to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 23 December 2025.
Use the filters below to find and compare flights from Sydney to St. Louis that are best for you.

Fly from

Sydney

Fly to

St. Louis

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 3/2

11:20-15:15

2 stops44h 55m

Lambert-St Louis

Tue 10/2

16:15-09:35

2 stops24h 20m

$1,596

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 1/4

10:20-16:56

2 stops22h 36m

Lambert-St Louis

Mon 6/4

16:05-07:20

2 stops48h 15m

$1,605

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 1/4

10:20-16:56

2 stops22h 36m

Lambert-St Louis

Mon 6/4

14:40-07:20

2 stops25h 40m

$1,647

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 4/2

14:05-16:14

1 stop19h 09m

Lambert-St Louis

Wed 11/2

11:55-08:00

2 stops27h 05m

$2,067

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 4/2

11:20-22:58

3 stops28h 38m

Lambert-St Louis

Wed 11/2

14:45-09:35

2 stops25h 50m

$2,300

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 7/3

17:30-23:48

2 stops23h 18m

Lambert-St Louis

Mon 9/3

06:38-09:00

1 stop34h 22m

$2,328

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 3/2

11:20-23:59

1 stop29h 39m

Lambert-St Louis

Tue 10/2

07:04-09:00

1 stop32h 56m

$2,335

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 7/3

11:20-22:59

3 stops28h 39m

Lambert-St Louis

Mon 9/3

07:40-08:35

3 stops32h 55m

$2,495

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 5/2

10:30-23:33

3 stops54h 03m

$909

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 5/2

11:20-23:59

1 stop29h 39m

$1,153

Flights are sorted by cheapest return flights first.

Deals found on 22/12

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 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 Sydney to St. Louis

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

Currently, November is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $1,256). Flying from Sydney to St. Louis in December is currently the most expensive (average of $2,026). 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.

How much does it cost for a return flight from Sydney to St. Louis?

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated 23 December 2025.
Get a feel of what it's like to fly with Qantas Airways, United Airlines, andAir Canada from Sydney to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
949 reviews
Check prices

Comfort

7.5

Overall

7.5

Entertainment

7.2

Boarding

7.7

Crew

8.1

Food

7.0

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
Qantas Airways
7.5
Good
949 reviews
Qantas Airways
7.5
Good
949 reviews
Check prices

Comfort

7.5

Overall

7.5

Entertainment

7.2

Boarding

7.7

Crew

8.1

Food

7.0

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
United Airlines
7.4
Good
9,106 reviews
Qantas Airways
7.5
Good
949 reviews
Check prices

Comfort

7.5

Overall

7.5

Entertainment

7.2

Boarding

7.7

Crew

8.1

Food

7.0

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.
Air Canada
7.1
Good
10,551 reviews
Qantas Airways
7.5
Good
949 reviews
Check prices

Comfort

7.5

Overall

7.5

Entertainment

7.2

Boarding

7.7

Crew

8.1

Food

7.0

Reviews

1 / 20
6.0
Good

Marco,Dec 2025

BOS - LAX

There was no WiFi or tv traveling from LAX to Sydney. Way too long of a flight to have nothing.

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.

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

    Departing from Sydney to St. Louis will take you 22h 36m. The distance from Sydney to St. Louis is about 14571 km.

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

    Flying on United Airlines is currently your cheapest option to St. Louis, with prices starting at $1,258. Additional round-trip tickets that might be worth considering are offered by Air Canada and Qantas Airways, with the lowest prices starting at $1,577 and $1,828, respectively. Users have found that United Airlines is 38% 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 holiday 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, November is the cheapest month in which you can book a flight from Sydney to St. Louis (average of $1,256). Flying from Sydney to St. Louis in December is currently the most expensive (average of $2,026). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Sydney to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Sydney to Kansas City flights

Top 3 airlines flying from Sydney to St. Louis

Discover the top 3 airlines that operate flights from Sydney to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 23 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,258Average$2,055FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,577Average$1,782FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Qantas AirwaysCheapest$1,828Average$2,011FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

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 Sydney to St. Louis?

When you search for this flight from Sydney to St. Louis, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Cheapflights simply makes it quick and affordable to book flights from Sydney to St. Louis by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

Yes! Cheapflights helps users easily find flights from Sydney to St. Louis with no change fees.

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

Not ready to book yet? You can track prices for flights from Sydney to St. Louis on Cheapflights with our Price Alert feature and get notified when better prices are available.

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