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Cheap flights from Sydney to St. Louis from $743

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Sydney to St. Louis departing on 4/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Sydney to St. Louis

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
13:15 - 11:17SYD  Sydney Kingsford Smith-STL Lambert-St Louis
37h 02m3 stops Nadi Los Angeles Los Angeles Las Vegas Harry Reid Intl
Multiple Airlines Logo
12:17 - 22:25STL  Lambert-St Louis-SYD Sydney Kingsford Smith
43h 08m3 stops Las Vegas Harry Reid Intl Los Angeles Los Angeles Nadi
$1,332Multiple Airlines
Wed, 9 Sep - Sat, 19 Sep
Air Canada Logo
11:20 - 16:57SYD  Sydney Kingsford Smith-STL Lambert-St Louis
22h 37m2 stops Vancouver Intl Denver Intl
Air Canada Logo
08:50 - 09:35STL  Lambert-St Louis-SYD Sydney Kingsford Smith
31h 45m2 stops Denver Intl Vancouver Intl
$1,454Air Canada
Thu, 12 Nov - Mon, 16 Nov
Air Canada Logo
11:20 - 16:57SYD  Sydney Kingsford Smith-STL Lambert-St Louis
22h 37m2 stops Vancouver Intl Denver Intl
Air Canada Logo
06:00 - 09:35STL  Lambert-St Louis-SYD Sydney Kingsford Smith
34h 35m3 stops Chicago O'Hare Intl Toronto Pearson Intl Vancouver Intl
$1,465Air Canada
Thu, 12 Nov - Mon, 16 Nov
United Airlines Logo
09:20 - 14:13SYD  Sydney Kingsford Smith-STL Lambert-St Louis
21h 53m1 stop Houston George Bush Intcntl
United Airlines Logo
17:55 - 07:00STL  Lambert-St Louis-SYD Sydney Kingsford Smith
44h 05m1 stop Houston George Bush Intcntl
$1,505United Airlines
Thu, 12 Nov - Mon, 16 Nov
Qantas Airways Logo
09:10 - 23:30SYD  Sydney Kingsford Smith-STL Lambert-St Louis
29h 20m1 stop Los Angeles Los Angeles
Qantas Airways Logo
06:20 - 07:05STL  Lambert-St Louis-SYD Sydney Kingsford Smith
33h 45m1 stop Los Angeles Los Angeles
$1,516Qantas Airways
Wed, 9 Sep - Sat, 19 Sep
United Airlines Logo
10:20 - 16:34SYD  Sydney Kingsford Smith-STL Lambert-St Louis
21h 14m2 stops San Francisco Denver Intl
United Airlines Logo
13:29 - 07:00STL  Lambert-St Louis-SYD Sydney Kingsford Smith
26h 31m2 stops Chicago O'Hare Intl Los Angeles Los Angeles
$1,529United Airlines
Mon, 21 Sep - Wed, 30 Sep
American Airlines Logo
09:10 - 16:48SYD  Sydney Kingsford Smith-STL Lambert-St Louis
22h 38m2 stops Los Angeles Los Angeles Chicago O'Hare Intl
American Airlines Logo
15:34 - 07:05STL  Lambert-St Louis-SYD Sydney Kingsford Smith
24h 31m2 stops Dallas/Fort Worth Los Angeles Los Angeles
$1,553American Airlines
Wed, 9 Sep - Sat, 19 Sep
American Airlines Logo
09:10 - 23:30SYD  Sydney Kingsford Smith-STL Lambert-St Louis
29h 20m1 stop Los Angeles Los Angeles
American Airlines Logo
13:49 - 07:05STL  Lambert-St Louis-SYD Sydney Kingsford Smith
26h 16m2 stops Chicago O'Hare Intl Los Angeles Los Angeles
$1,553American Airlines
Wed, 9 Sep - Sat, 19 Sep
Qantas Airways Logo
10:10 - 23:46SYD  Sydney Kingsford Smith-STL Lambert-St Louis
29h 36m1 stop Los Angeles Los Angeles
Qantas Airways Logo
14:54 - 11:55STL  Lambert-St Louis-SYD Sydney Kingsford Smith
28h 01m2 stops Dallas/Fort Worth Brisbane
$1,711Qantas Airways
Wed, 21 Oct - Sat, 14 Nov
United Airlines Logo
11:20 - 18:43SYD  Sydney Kingsford Smith-STL Lambert-St Louis
23h 23m1 stop San Francisco
United Airlines Logo
16:39 - 07:00STL  Lambert-St Louis-SYD Sydney Kingsford Smith
45h 21m2 stops Denver Intl Houston George Bush Intcntl
$1,840United Airlines
Wed, 21 Oct - Sat, 14 Nov

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Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
12 Nov
SYD11:20Sydney Kingsford Smith
22h 37m
2 stops
STL16:57Lambert-St Louis
16 Nov
STL08:50Lambert-St Louis
31h 45m
2 stops
SYD09:35Sydney Kingsford Smith
$1,454
Air Canada
12 Nov
SYD11:20Sydney Kingsford Smith
22h 37m
2 stops
STL16:57Lambert-St Louis
16 Nov
STL06:00Lambert-St Louis
34h 35m
3 stops
SYD09:35Sydney Kingsford Smith
$1,465
Air Canada
12 Nov
SYD11:20Sydney Kingsford Smith
28h 55m
3 stops
STL23:15Lambert-St Louis
16 Nov
STL09:40Lambert-St Louis
30h 55m
3 stops
SYD09:35Sydney Kingsford Smith
$1,477

United Airlines flights from Sydney to St. Louis

Our best United Airlines deals on Sydney to St. Louis flight tickets
United Airlines
10 Aug
SYD10:20Sydney Kingsford Smith
27h 25m
2 stops
STL22:45Lambert-St Louis
23 Aug
STL09:00Lambert-St Louis
31h 00m
2 stops
SYD07:00Sydney Kingsford Smith
$1,440
United Airlines
12 Nov
SYD09:20Sydney Kingsford Smith
21h 53m
1 stop
STL14:13Lambert-St Louis
16 Nov
STL17:55Lambert-St Louis
44h 05m
1 stop
SYD07:00Sydney Kingsford Smith
$1,505
United Airlines
9 Aug
SYD10:20Sydney Kingsford Smith
22h 57m
1 stop
STL18:17Lambert-St Louis
23 Aug
STL09:00Lambert-St Louis
31h 00m
2 stops
SYD07:00Sydney Kingsford Smith
$1,511

momondo 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, momondo users made 78,305 searches. Data last updated 8 August 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 Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 9/9

13:15-11:17

3 stops37h 02m

Lambert-St Louis

Sat 19/9

12:17-22:25

3 stops43h 08m

$1,332

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Thu 12/11

11:20-16:57

2 stops22h 37m

Lambert-St Louis

Mon 16/11

08:50-09:35

2 stops31h 45m

$1,454

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Thu 12/11

11:20-16:57

2 stops22h 37m

Lambert-St Louis

Mon 16/11

06:00-09:35

3 stops34h 35m

$1,465

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Thu 12/11

09:20-14:13

1 stop21h 53m

Lambert-St Louis

Mon 16/11

17:55-07:00

1 stop44h 05m

$1,505

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 9/9

09:10-23:30

1 stop29h 20m

Lambert-St Louis

Sat 19/9

06:20-07:05

1 stop33h 45m

$1,516

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Mon 21/9

10:20-16:34

2 stops21h 14m

Lambert-St Louis

Wed 30/9

13:29-07:00

2 stops26h 31m

$1,529
Fastest return journey

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 9/9

09:10-16:48

2 stops22h 38m

Lambert-St Louis

Sat 19/9

15:34-07:05

2 stops24h 31m

$1,553

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 9/9

09:10-23:30

1 stop29h 20m

Lambert-St Louis

Sat 19/9

13:49-07:05

2 stops26h 16m

$1,553

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 21/10

10:10-23:46

1 stop29h 36m

Lambert-St Louis

Sat 14/11

14:54-11:55

2 stops28h 01m

$1,711

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 21/10

11:20-18:43

1 stop23h 23m

Lambert-St Louis

Sat 14/11

16:39-07:00

2 stops45h 21m

$1,840

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Sydney to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Sydney and St. Louis?

Prices are currently low for flights on this route.

Typical prices usually range from $1,508 to $1,541.
The lowest price recently found on this route was $1,321.

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

The month of September is, on average, the cheapest month to fly to St. Louis from Sydney, with most prices found around $1,474. If you aren’t able to travel to St. Louis during the month of September, then flying in July is also cheap. Prices for this month can be found on momondo for an average of $1,504.

Can stopping save me money on Sydney to St. Louis flights?

You could potentially save up to 1% on your flight if you consider stops on a Sydney to St. Louis flight.

When to book flights from Sydney to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Sydney to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Sydney to St. Louis (SYD to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Sydney to St. Louis

Fastest flight time

19h 09m

Direct flights

None
The fastest flight from Sydney to St. Louis takes 19h 09m
There are no direct flights from Sydney to St. Louis. There are no popular flight routes from Sydney to St. Louis.
Search flight deals

Frequently asked questions about flying from Sydney to St. Louis

  • How far is Sydney Kingsford Smith to Lambert-St Louis by plane?

    Sydney Kingsford Smith and Lambert-St Louis are 14576.1 km apart from one another. By plane, this route typically takes 19h 09m.

  • When did momondo last update prices for flights from Sydney Kingsford Smith Airport to Lambert-St Louis Airport?

    Prices for flights from Sydney Kingsford Smith Airport to Lambert-St Louis Airport refresh daily.

  • How many operators does momondo search for flights from Sydney Kingsford Smith Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Sydney Kingsford Smith Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Sydney Kingsford Smith Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Sydney to St. Louis?

Best airlines flying from Sydney to St. Louis

Compare and see reviews for airlines that fly from Sydney to St. Louis with momondo
Airline
Rating
Free cancellation
Price
United AirlinesPriceFrom $1,186Free cancellationRating
7.4
10,084 reviews
Search United Airlines flights
American AirlinesPriceFrom $1,477Free cancellationRating
7.1
11,885 reviews
Search American Airlines flights
Qantas AirwaysPriceFrom $1,485Free cancellationRating
7.5
1,079 reviews
Search Qantas Airways flights

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Collinsville
St. Charles

Why use momondo?

Why should I use momondo to find a flight deal from Sydney to St. Louis?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Sydney.

Can I find flights from Sydney to St. Louis with flexible booking policies on momondo?

Flights from Sydney to St. Louis with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Sydney to St. Louis?

Once you have performed a search for Sydney to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Sydney to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from Sydney. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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