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Cheap flights from Sydney to St. Louis from $612

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 7/30. 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

Find the cheapest flights from Sydney to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
9:10 am - 10:59 pm
SYD
-
STL
28h 49m
1 stop
American Airlines Logo
6:00 am - 9:15 am
STL
-
SYD
36h 15m
2 stops
$1,008American Airlines
Thu, Aug 13 - Tue, Aug 25
Qantas Airways Logo
1:05 pm - 6:20 pm
SYD
-
STL
21h 15m
1 stop
Qantas Airways Logo
7:00 am - 9:00 am
STL
-
SYD
33h 00m
1 stop
$1,041Qantas Airways
Wed, Oct 28 - Tue, Nov 10
Qantas Airways Logo
2:05 pm - 7:30 pm
SYD
-
STL
22h 25m
1 stop
Qantas Airways Logo
7:00 am - 9:00 am
STL
-
SYD
33h 00m
1 stop
$1,042Qantas Airways
Wed, Nov 4 - Tue, Nov 10
American Airlines Logo
9:00 am - 6:32 pm
SYD
-
STL
24h 32m
2 stops
American Airlines Logo
6:00 am - 7:05 am
STL
-
SYD
34h 05m
1 stop
$1,060American Airlines
Sat, Aug 1 - Fri, Aug 7
American Airlines Logo
9:10 am - 10:59 pm
SYD
-
STL
28h 49m
1 stop
American Airlines Logo
12:45 pm - 7:05 am
STL
-
SYD
27h 20m
2 stops
$1,070American Airlines
Wed, Aug 12 - Sun, Aug 16
Qantas Airways Logo
11:15 am - 11:42 pm
SYD
-
STL
29h 27m
1 stop
Qantas Airways Logo
6:13 pm - 10:55 am
STL
-
SYD
23h 42m
2 stops
$1,071Qantas Airways
Wed, Nov 4 - Tue, Nov 10
American Airlines Logo
9:10 am - 11:42 pm
SYD
-
STL
29h 32m
2 stops
American Airlines Logo
2:29 pm - 7:30 am
STL
-
SYD
26h 01m
2 stops
$1,076American Airlines
Wed, Aug 12 - Sun, Aug 16
American Airlines Logo
9:10 am - 10:59 pm
SYD
-
STL
28h 49m
1 stop
American Airlines Logo
10:16 am - 7:30 am
STL
-
SYD
30h 14m
2 stops
$1,077American Airlines
Wed, Aug 12 - Sun, Aug 16
American Airlines Logo
9:10 am - 8:26 pm
SYD
-
STL
26h 16m
2 stops
American Airlines Logo
2:29 pm - 7:30 am
STL
-
SYD
26h 01m
2 stops
$1,079American Airlines
Wed, Aug 12 - Sun, Aug 16
American Airlines Logo
11:15 am - 11:46 pm
SYD
-
STL
28h 31m
1 stop
American Airlines Logo
2:29 pm - 9:00 am
STL
-
SYD
25h 31m
2 stops
$1,083American Airlines
Wed, Oct 28 - Tue, Nov 10

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United Airlines flights from Sydney to St. Louis

Our best United Airlines deals on Sydney to St. Louis flight tickets
United Airlines
Jul 7
SYD10:20 amSydney Kingsford Smith
22h 57m
1 stop
STL6:17 pmLambert-St Louis
Sep 7
STL12:59 pmLambert-St Louis
26h 56m
2 stops
SYD6:55 amSydney Kingsford Smith
$998
United Airlines
Jul 7
SYD10:20 amSydney Kingsford Smith
22h 57m
1 stop
STL6:17 pmLambert-St Louis
Sep 7
STL3:13 pmLambert-St Louis
24h 42m
2 stops
SYD6:55 amSydney Kingsford Smith
$1,000
United Airlines
Jul 8
SYD10:20 amSydney Kingsford Smith
22h 57m
1 stop
STL6:17 pmLambert-St Louis
Sep 10
STL8:42 amLambert-St Louis
31h 13m
1 stop
SYD6:55 amSydney Kingsford Smith
$1,046

Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
Nov 4
SYD11:20 amSydney Kingsford Smith
26h 14m
2 stops
STL8:34 pmLambert-St Louis
Nov 10
STL9:40 amLambert-St Louis
30h 55m
3 stops
SYD9:35 amSydney Kingsford Smith
$1,587
Air Canada
Sep 9
SYD9:20 amSydney Kingsford Smith
28h 39m
3 stops
STL10:59 pmLambert-St Louis
Oct 3
STL10:27 amLambert-St Louis
29h 53m
3 stops
SYD7:20 amSydney Kingsford Smith
$1,678
Air Canada
Aug 13
SYD9:20 amSydney Kingsford Smith
48h 22m
2 stops
STL6:42 pmLambert-St Louis
Aug 25
STL12:10 pmLambert-St Louis
52h 10m
3 stops
SYD7:20 amSydney Kingsford Smith
$1,742

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 July 4, 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 round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 8/13

9:10 am-10:59 pm

1 stop28h 49m

Lambert-St Louis

Tue 8/25

6:00 am-9:15 am

2 stops36h 15m

$1,008

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/28

1:05 pm-6:20 pm

1 stop21h 15m

Lambert-St Louis

Tue 11/10

7:00 am-9:00 am

1 stop33h 00m

$1,041

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 11/4

2:05 pm-7:30 pm

1 stop22h 25m

Lambert-St Louis

Tue 11/10

7:00 am-9:00 am

1 stop33h 00m

$1,042

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 8/1

9:00 am-6:32 pm

2 stops24h 32m

Lambert-St Louis

Fri 8/7

6:00 am-7:05 am

1 stop34h 05m

$1,060

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/12

9:10 am-10:59 pm

1 stop28h 49m

Lambert-St Louis

Sun 8/16

12:45 pm-7:05 am

2 stops27h 20m

$1,070

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 11/4

11:15 am-11:42 pm

1 stop29h 27m

Lambert-St Louis

Tue 11/10

6:13 pm-10:55 am

2 stops23h 42m

$1,071

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/12

9:10 am-11:42 pm

2 stops29h 32m

Lambert-St Louis

Sun 8/16

2:29 pm-7:30 am

2 stops26h 01m

$1,076

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/12

9:10 am-10:59 pm

1 stop28h 49m

Lambert-St Louis

Sun 8/16

10:16 am-7:30 am

2 stops30h 14m

$1,077
Quickest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/12

9:10 am-8:26 pm

2 stops26h 16m

Lambert-St Louis

Sun 8/16

2:29 pm-7:30 am

2 stops26h 01m

$1,079

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/28

11:15 am-11:46 pm

1 stop28h 31m

Lambert-St Louis

Tue 11/10

2:29 pm-9:00 am

2 stops25h 31m

$1,083

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, September 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 $1,039. The month of August is another great option to travel to St. Louis, with average flight prices from Sydney averaging around $1,068.

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

You could potentially save up to 60% 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

22h 57m

Direct flights

None
The fastest flight from Sydney to St. Louis takes 22h 57m
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?

    A flight from Sydney Kingsford Smith to Lambert-St Louis will travel around 9057.2 mi. Typically, this will take 22h 57m 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 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.

Traveling to a place near St. Louis?

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