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Cheap flights from Sydney to St. Louis from $656

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 1/29. 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
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
11:20 am - 8:26 pm
SYD
-
STL
26h 06m2 stops
Air Canada Logo
6:00 pm - 9:35 am
STL
-
SYD
46h 35m2 stops
$1,168Air Canada
Wed, Feb 18 - Sun, Feb 22
Air Canada Logo
11:20 am - 8:26 pm
SYD
-
STL
26h 06m2 stops
Air Canada Logo
6:00 pm - 9:35 am
STL
-
SYD
46h 35m2 stops
$1,170Air Canada
Wed, Feb 18 - Sun, Feb 22
Qantas Airways Logo
11:20 am - 11:48 pm
SYD
-
STL
29h 28m1 stop
Qantas Airways Logo
3:31 pm - 12:15 pm
STL
-
SYD
27h 44m2 stops
$1,442Qantas Airways
Wed, Feb 18 - Sun, Feb 22
Qantas Airways Logo
11:20 am - 11:48 pm
SYD
-
STL
29h 28m1 stop
Qantas Airways Logo
6:50 pm - 10:55 am
STL
-
SYD
23h 05m2 stops
$1,444Qantas Airways
Wed, Feb 18 - Sun, Feb 22
Air Canada Logo
11:20 am - 10:59 pm
SYD
-
STL
28h 39m3 stops
Air Canada Logo
2:45 pm - 9:35 am
STL
-
SYD
25h 50m2 stops
$1,617Air Canada
Wed, Feb 18 - Sun, Feb 22
Air Canada Logo
11:20 am - 10:59 pm
SYD
-
STL
28h 39m3 stops
Air Canada Logo
2:45 pm - 9:35 am
STL
-
SYD
25h 50m2 stops
$1,619Air Canada
Wed, Feb 18 - Sun, Feb 22
United Airlines Logo
12:10 pm - 4:44 pm
SYD
-
STL
21h 34m1 stop
United Airlines Logo
4:39 pm - 7:00 am
STL
-
SYD
21h 21m1 stop
$1,673United Airlines
Wed, Feb 18 - Sun, Feb 22
United Airlines Logo
11:50 am - 3:38 pm
SYD
-
STL
20h 48m1 stop
United Airlines Logo
4:39 pm - 7:00 am
STL
-
SYD
21h 21m1 stop
$1,676United Airlines
Wed, Feb 18 - Sun, Feb 22
Delta Logo
2:15 pm - 9:39 am
SYD
-
STL
36h 24m2 stops
Delta Logo
10:45 am - 6:35 am
STL
-
SYD
28h 50m2 stops
$1,895Delta
Sat, Jan 10 - Sun, Jun 7
United Airlines Logo
2:00 pm - 5:11 am
SYD
-
STL
32h 11m1 stop
United Airlines Logo
1:27 pm - 7:00 am
STL
-
SYD
26h 33m2 stops
$1,899United Airlines
Sat, Jan 10 - Sun, Jun 7

Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
Feb 18
SYD11:20 amSydney Kingsford Smith
26h 06m
2 stops
STL8:26 pmLambert-St Louis
Feb 22
STL6:00 pmLambert-St Louis
46h 35m
2 stops
SYD9:35 amSydney Kingsford Smith
$1,164
Find similar
Air Canada
Feb 18
SYD11:20 amSydney Kingsford Smith
26h 06m
2 stops
STL8:26 pmLambert-St Louis
Feb 22
STL6:00 pmLambert-St Louis
46h 35m
2 stops
SYD9:35 amSydney Kingsford Smith
$1,168
Find similar
Air Canada
Feb 18
SYD11:20 amSydney Kingsford Smith
26h 06m
2 stops
STL8:26 pmLambert-St Louis
Feb 22
STL6:00 pmLambert-St Louis
46h 35m
2 stops
SYD9:35 amSydney Kingsford Smith
$1,170
Find similar

Qantas Airways flights from Sydney to St. Louis

Our best Qantas Airways deals on Sydney to St. Louis flight tickets
Qantas Airways
Feb 18
SYD11:20 amSydney Kingsford Smith
29h 28m
1 stop
STL11:48 pmLambert-St Louis
Feb 22
STL3:31 pmLambert-St Louis
26h 24m
2 stops
SYD10:55 amSydney Kingsford Smith
$1,438
Find similar
Qantas Airways
Feb 18
SYD11:20 amSydney Kingsford Smith
29h 28m
1 stop
STL11:48 pmLambert-St Louis
Feb 22
STL3:31 pmLambert-St Louis
27h 44m
2 stops
SYD12:15 pmSydney Kingsford Smith
$1,442
Find similar
Qantas Airways
Feb 18
SYD11:20 amSydney Kingsford Smith
29h 28m
1 stop
STL11:48 pmLambert-St Louis
Feb 22
STL6:50 pmLambert-St Louis
23h 05m
2 stops
SYD10:55 amSydney Kingsford Smith
$1,444
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 December 18, 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

Wed 2/18

11:20 am-8:26 pm

2 stops26h 06m

Lambert-St Louis

Sun 2/22

6:00 pm-9:35 am

2 stops46h 35m

$1,168

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

11:20 am-8:26 pm

2 stops26h 06m

Lambert-St Louis

Sun 2/22

6:00 pm-9:35 am

2 stops46h 35m

$1,170

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

11:20 am-11:48 pm

1 stop29h 28m

Lambert-St Louis

Sun 2/22

3:31 pm-12:15 pm

2 stops27h 44m

$1,442

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

11:20 am-11:48 pm

1 stop29h 28m

Lambert-St Louis

Sun 2/22

6:50 pm-10:55 am

2 stops23h 05m

$1,444

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

11:20 am-10:59 pm

3 stops28h 39m

Lambert-St Louis

Sun 2/22

2:45 pm-9:35 am

2 stops25h 50m

$1,617

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

11:20 am-10:59 pm

3 stops28h 39m

Lambert-St Louis

Sun 2/22

2:45 pm-9:35 am

2 stops25h 50m

$1,619

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

12:10 pm-4:44 pm

1 stop21h 34m

Lambert-St Louis

Sun 2/22

4:39 pm-7:00 am

1 stop21h 21m

$1,673

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 2/18

11:50 am-3:38 pm

1 stop20h 48m

Lambert-St Louis

Sun 2/22

4:39 pm-7:00 am

1 stop21h 21m

$1,676

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 1/10

2:15 pm-9:39 am

2 stops36h 24m

Lambert-St Louis

Sun 6/7

10:45 am-6:35 am

2 stops28h 50m

$1,895

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 1/10

2:00 pm-5:11 am

1 stop32h 11m

Lambert-St Louis

Sun 6/7

1:27 pm-7:00 am

2 stops26h 33m

$1,899

Flights are sorted by cheapest round-trip 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 cheapest month to fly to St. Louis?

In general, August 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 $1,128. The month of November is another great option to travel to St. Louis, with average flight prices from Sydney averaging around $1,192.

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 5% 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

Fastest flight time

36h 24m

Direct flights

None
The fastest flight from Sydney to St. Louis takes 36h 24m
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 36h 24m 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
Qantas AirwaysPriceFrom $1,110Free CancellationRating
7.5
947 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
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Clayton
Festus
Glencoe
Farmington
Eureka
Edwardsville
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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