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Cheap flights from Sydney to St. Louis from $1,135

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 30/7. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
22 Apr — 29 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Sydney to St. Louis

Enter your travel dates to find the best prices.

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 23 March 2026.

Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 28/513:05
STL
-
SYD
2 stops27h 15m
Air Canada
Deal found 22/3$1,344
Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Multiple Airlines
Thu 28/513:38
STL
-
SYD
2 stops26h 42m
Multiple Airlines
Deal found 20/3$1,346
Thu 14/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Sun 7/607:05
STL
-
SYD
2 stops57h 15m
Air Canada
Deal found 19/3$1,350
Mon 23/1111:20
SYD
-
STL
2 stops45h 10m
Air Canada
Tue 1/1213:30
STL
-
SYD
2 stops24h 25m
Air Canada
Deal found 18/3$1,472
Sat 21/1111:20
SYD
-
STL
2 stops22h 06m
Air Canada
Wed 2/1216:15
STL
-
SYD
2 stops45h 40m
Air Canada
Deal found 18/3$1,481
Mon 10/809:20
SYD
-
STL
2 stops50h 19m
Air Canada
Wed 2/908:55
STL
-
SYD
2 stops55h 25m
Air Canada
Deal found 18/3$1,482

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 March 2026.

Round-trip from

$1,344

One-way from

$1,135

Popular in

July

Cheapest in

May

Average price

$1,706
Air Canada
  • Air Canada
  • 20/5-28/5
  • 4 total stops
  • 69h 01m total
  • Sydney to St. Louis
Search Deals
Air Canada
  • Air Canada
  • 30/7
  • 2 total stops
  • 43h 42m total
  • Sydney to St. Louis
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($70 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($77 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
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 March 2026.
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

Cheapest return flight

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

13:05-07:20

3 stops51h 15m

$1,428

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 23/7

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Sun 16/8

13:36-07:00

2 stops26h 24m

$1,676

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 10/8

09:30-18:13

2 stops23h 43m

Lambert-St Louis

Wed 2/9

15:02-07:00

2 stops24h 58m

$1,677

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 28/8

09:10-15:48

2 stops21h 38m

Lambert-St Louis

Tue 1/9

20:00-07:05

2 stops44h 05m

$1,712

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:10-23:59

1 stop29h 49m

Lambert-St Louis

Thu 28/5

14:36-07:05

2 stops25h 29m

$1,712
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

10:20-18:22

1 stop23h 02m

Lambert-St Louis

Thu 28/5

19:23-06:55

1 stop20h 32m

$1,737

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/8

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Mon 31/8

15:02-07:00

2 stops24h 58m

$1,743

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 7/6

09:15-08:42

2 stops38h 27m

Lambert-St Louis

Sun 12/7

08:48-06:50

2 stops31h 02m

$1,746

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/8

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Sat 29/8

15:02-07:00

2 stops24h 58m

$1,754

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 9/8

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Tue 1/9

15:10-07:00

2 stops24h 50m

$1,754

Flights are sorted by cheapest return flights first.

Deals found on 21/3

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

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 $1,188). Flying from Sydney to St. Louis in December is currently the most expensive (average of $1,771). 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 March 2026.
Get a feel of what it's like to fly with Qantas Airways,United Airlines, andAmerican Airlines 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
1,007 reviews
Check prices

Crew

8.1

Food

7.0

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Overall

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Qantas Airways
7.5
Good
1,007 reviews
Qantas Airways
7.5
Good
1,007 reviews
Check prices

Crew

8.1

Food

7.0

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Overall

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
United Airlines
7.4
Good
9,458 reviews
Qantas Airways
7.5
Good
1,007 reviews
Check prices

Crew

8.1

Food

7.0

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Overall

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
American Airlines
7.1
Good
11,488 reviews
Qantas Airways
7.5
Good
1,007 reviews
Check prices

Crew

8.1

Food

7.0

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Overall

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Air Canada
7.1
Good
10,834 reviews
Qantas Airways
7.5
Good
1,007 reviews
Check prices

Crew

8.1

Food

7.0

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Overall

7.5

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.

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 21h 38m. The distance from Sydney to St. Louis is about 14571 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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 $1,186. Additional round-trip tickets that might be worth considering are offered by Air Canada and Qantas Airways, with the lowest prices starting at $1,491 and $1,547, respectively. Users have found that United Airlines is 37% 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 $1,188). Flying from Sydney to St. Louis in December is currently the most expensive (average of $1,771). 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 4 airlines flying from Sydney to St. Louis

Discover the top 4 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 March 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,186Average$1,940FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,491Average$1,606FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Qantas AirwaysCheapest$1,547Average$1,851FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,641Average$1,786FlexibilityNo cancel feeOn-time71%
Search American Airlines 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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