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Cheap flights from Sydney to St. Louis from $741

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 12/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Sydney to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
10:25 am - 3:29 pmSYD-STL
45h 04m2 stops
Air Canada Logo
3:00 pm - 8:35 amSTL-SYD
25h 35m2 stops
$878Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
Air Canada Logo
11:20 am - 3:29 pmSYD-STL
45h 09m2 stops
Air Canada Logo
4:05 pm - 9:35 amSTL-SYD
48h 30m2 stops
$915Air Canada
Find Deal
Mon, Nov 24 - Sun, Nov 30
American Airlines Logo
11:20 am - 11:42 pmSYD-STL
29h 22m1 stop
American Airlines Logo
7:00 am - 9:00 amSTL-SYD
33h 00m1 stop
$974American Airlines
Find Deal
Mon, Nov 24 - Sun, Nov 30
United Airlines Logo
11:50 am - 5:39 pmSYD-STL
22h 49m2 stops
United Airlines Logo
11:20 am - 7:00 amSTL-SYD
26h 40m1 stop
$991United Airlines
Find Deal
Mon, Nov 24 - Sun, Nov 30
Air Canada Logo
10:25 am - 3:29 pmSYD-STL
45h 04m2 stops
Air Canada Logo
3:00 pm - 8:35 amSTL-SYD
25h 35m2 stops
$1,158Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
American Airlines Logo
8:45 am - 7:51 pmSYD-STL
28h 06m2 stops
American Airlines Logo
6:30 am - 7:05 amSTL-SYD
33h 35m1 stop
$1,297American Airlines
Find Deal
Sat, Jan 10 - Sun, Jun 7
Air Canada Logo
10:25 am - 9:50 pmSYD-STL
27h 25m3 stops
Air Canada Logo
3:00 pm - 8:35 amSTL-SYD
25h 35m2 stops
$1,423Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
Delta Logo
2:15 pm - 9:35 pmSYD-STL
24h 20m2 stops
Delta Logo
6:00 am - 6:35 amSTL-SYD
33h 35m2 stops
$1,585Delta
Find Deal
Sat, Jan 10 - Sun, Jun 7
United Airlines Logo
11:50 am - 3:54 pmSYD-STL
20h 04m1 stop
United Airlines Logo
4:35 pm - 7:00 amSTL-SYD
22h 25m1 stop
$1,657United Airlines
Find Deal
Thu, Mar 12 - Mon, Mar 16
Qantas Airways Logo
5:45 pm - 11:57 pmSYD-STL
23h 12m1 stop
Qantas Airways Logo
6:20 am - 7:25 amSTL-SYD
32h 05m1 stop
$1,786Qantas Airways
Find Deal
Sun, Dec 14 - Sun, Dec 21

Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
Mar 12
SYD10:25 amSydney Kingsford Smith
45h 04m
2 stops
STL3:29 pmLambert-St Louis
Mar 16
STL3:00 pmLambert-St Louis
25h 35m
2 stops
SYD8:35 amSydney Kingsford Smith
$878
Find similar
Air Canada
Nov 24
SYD11:20 amSydney Kingsford Smith
45h 09m
2 stops
STL3:29 pmLambert-St Louis
Nov 30
STL4:05 pmLambert-St Louis
48h 30m
2 stops
SYD9:35 amSydney Kingsford Smith
$915
Find similar
Air Canada
Mar 12
SYD10:25 amSydney Kingsford Smith
45h 04m
2 stops
STL3:29 pmLambert-St Louis
Mar 16
STL3:00 pmLambert-St Louis
25h 35m
2 stops
SYD8:35 amSydney Kingsford Smith
$1,158
Find similar

American Airlines flights from Sydney to St. Louis

Our best American Airlines deals on Sydney to St. Louis flight tickets
American Airlines
Nov 24
SYD11:20 amSydney Kingsford Smith
29h 22m
1 stop
STL11:42 pmLambert-St Louis
Nov 30
STL7:00 amLambert-St Louis
33h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
$974
Find similar
American Airlines
Jan 10
SYD8:45 amSydney Kingsford Smith
28h 06m
2 stops
STL7:51 pmLambert-St Louis
Jun 7
STL6:30 amLambert-St Louis
33h 35m
1 stop
SYD7:05 amSydney Kingsford Smith
$1,297
Find similar
American Airlines
Mar 12
SYD11:20 amSydney Kingsford Smith
27h 49m
1 stop
STL11:09 pmLambert-St Louis
Mar 16
STL4:43 pmLambert-St Louis
24h 17m
2 stops
SYD9:00 amSydney Kingsford Smith
$1,640
Find similar

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated October 30, 2025.
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

Thu 3/12

10:25 am-3:29 pm

2 stops45h 04m

Lambert-St Louis

Mon 3/16

3:00 pm-8:35 am

2 stops25h 35m

$878

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 11/24

11:20 am-3:29 pm

2 stops45h 09m

Lambert-St Louis

Sun 11/30

4:05 pm-9:35 am

2 stops48h 30m

$915

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 11/24

11:20 am-11:42 pm

1 stop29h 22m

Lambert-St Louis

Sun 11/30

7:00 am-9:00 am

1 stop33h 00m

$974

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 11/24

11:50 am-5:39 pm

2 stops22h 49m

Lambert-St Louis

Sun 11/30

11:20 am-7:00 am

1 stop26h 40m

$991

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

10:25 am-3:29 pm

2 stops45h 04m

Lambert-St Louis

Mon 3/16

3:00 pm-8:35 am

2 stops25h 35m

$1,158

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 1/10

8:45 am-7:51 pm

2 stops28h 06m

Lambert-St Louis

Sun 6/7

6:30 am-7:05 am

1 stop33h 35m

$1,297

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

10:25 am-9:50 pm

3 stops27h 25m

Lambert-St Louis

Mon 3/16

3:00 pm-8:35 am

2 stops25h 35m

$1,423

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 1/10

2:15 pm-9:35 pm

2 stops24h 20m

Lambert-St Louis

Sun 6/7

6:00 am-6:35 am

2 stops33h 35m

$1,585

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

11:50 am-3:54 pm

1 stop20h 04m

Lambert-St Louis

Mon 3/16

4:35 pm-7:00 am

1 stop22h 25m

$1,657

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 12/14

5:45 pm-11:57 pm

1 stop23h 12m

Lambert-St Louis

Sun 12/21

6:20 am-7:25 am

1 stop32h 05m

$1,786

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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?

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

In general, November is the cheapest month to fly from Sydney to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,031. The month of August is another great option to travel to St. Louis, with average flight prices from Sydney averaging around $1,128.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $1,050. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,861. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Sydney in the morning is the least expensive time of day to depart. momondo users have found prices as low as $1,352 when looking at flights departing in the morning. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $1,824 per ticket.

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

You could potentially save up to 10% 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 round-trip 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

Direct flights

None
There are no direct flights from Sydney to St. Louis. There are no popular flight routes from Sydney to St. Louis.
Search flight deals

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

    A flight from Sydney Kingsford Smith to Lambert-St Louis will travel around 9057.2 mi. Typically, this will take 20h 04m by plane in normal conditions.

  • 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 are updated 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 layovers 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 required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable 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 $857Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,110Free CancellationRating
7.5
925 reviews
Search Qantas Airways flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Sydney to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to St. Louis from Sydney with this policy.

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

Once all potential Sydney to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of Sydney to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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