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Cheap flights from Sydney to St. Louis from $629

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 5/25. 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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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 - 4:33 pm
SYD
-
STL
22h 23m
2 stops
American Airlines Logo
8:39 pm - 7:05 am
STL
-
SYD
43h 26m
2 stops
$1,009American Airlines
Thu, Jun 4 - Sat, Jun 13
United Airlines Logo
9:30 am - 9:30 pm
SYD
-
STL
27h 00m
2 stops
United Airlines Logo
10:25 am - 7:00 am
STL
-
SYD
29h 35m
2 stops
$1,031United Airlines
Wed, Jun 17 - Wed, Jun 24
Air Canada Logo
9:20 am - 4:33 pm
SYD
-
STL
22h 13m
2 stops
Air Canada Logo
4:48 pm - 7:20 am
STL
-
SYD
23h 32m
2 stops
$1,036Air Canada
Thu, Jun 11 - Wed, Jun 17
American Airlines Logo
9:10 am - 1:52 pm
SYD
-
STL
43h 42m
2 stops
American Airlines Logo
7:04 am - 6:55 am
STL
-
SYD
32h 51m
1 stop
$1,045American Airlines
Wed, Jun 3 - Sun, Jun 7
Qantas Airways Logo
9:10 am - 11:56 pm
SYD
-
STL
29h 46m
1 stop
Qantas Airways Logo
6:35 am - 7:05 am
STL
-
SYD
33h 30m
1 stop
$1,054Qantas Airways
Thu, Jun 4 - Sat, Jun 13
Qantas Airways Logo
12:00 pm - 4:41 pm
SYD
-
STL
19h 41m
1 stop
Qantas Airways Logo
5:11 pm - 6:55 am
STL
-
SYD
22h 44m
1 stop
$1,059Qantas Airways
Wed, Aug 12 - Sat, Sep 5
American Airlines Logo
9:10 am - 11:56 pm
SYD
-
STL
29h 46m
1 stop
American Airlines Logo
2:58 pm - 6:25 am
STL
-
SYD
24h 27m
2 stops
$1,060American Airlines
Wed, Jun 3 - Sun, Jun 7
American Airlines Logo
12:00 pm - 4:33 pm
SYD
-
STL
19h 33m
1 stop
American Airlines Logo
1:41 pm - 7:05 am
STL
-
SYD
26h 24m
2 stops
$1,066American Airlines
Thu, Jun 4 - Sat, Jun 13
American Airlines Logo
9:10 am - 8:32 am
SYD
-
STL
38h 22m
2 stops
American Airlines Logo
7:03 am - 6:55 am
STL
-
SYD
32h 52m
1 stop
$1,070American Airlines
Sun, May 31 - Wed, Jun 3
United Airlines Logo
10:20 am - 6:39 pm
SYD
-
STL
23h 19m
1 stop
United Airlines Logo
3:13 pm - 7:00 am
STL
-
SYD
24h 47m
2 stops
$1,081United Airlines
Wed, Aug 12 - Sat, Sep 5

American Airlines flights from Sydney to St. Louis

Our best American Airlines deals on Sydney to St. Louis flight tickets
American Airlines
Jun 4
SYD9:10 amSydney Kingsford Smith
22h 23m
2 stops
STL4:33 pmLambert-St Louis
Jun 13
STL8:39 pmLambert-St Louis
43h 26m
2 stops
SYD7:05 amSydney Kingsford Smith
$1,009
American Airlines
Jun 3
SYD9:10 amSydney Kingsford Smith
43h 42m
2 stops
STL1:52 pmLambert-St Louis
Jun 7
STL7:04 amLambert-St Louis
32h 51m
1 stop
SYD6:55 amSydney Kingsford Smith
$1,045
American Airlines
Jun 3
SYD9:10 amSydney Kingsford Smith
29h 46m
1 stop
STL11:56 pmLambert-St Louis
Jun 7
STL2:58 pmLambert-St Louis
24h 27m
2 stops
SYD6:25 amSydney Kingsford Smith
$1,060

Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
Jun 11
SYD9:20 amSydney Kingsford Smith
22h 13m
2 stops
STL4:33 pmLambert-St Louis
Jun 17
STL4:48 pmLambert-St Louis
23h 32m
2 stops
SYD7:20 amSydney Kingsford Smith
$1,036
Air Canada
Jul 29
SYD9:20 amSydney Kingsford Smith
43h 42m
2 stops
STL2:02 pmLambert-St Louis
Jul 31
STL4:48 pmLambert-St Louis
23h 32m
2 stops
SYD7:20 amSydney Kingsford Smith
$1,083
Air Canada
Aug 12
SYD9:20 amSydney Kingsford Smith
48h 22m
3 stops
STL6:42 pmLambert-St Louis
Sep 5
STL12:10 pmLambert-St Louis
52h 10m
3 stops
SYD7:20 amSydney Kingsford Smith
$1,089

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 May 20, 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 6/4

9:10 am-4:33 pm

2 stops22h 23m

Lambert-St Louis

Sat 6/13

8:39 pm-7:05 am

2 stops43h 26m

$1,009

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 6/17

9:30 am-9:30 pm

2 stops27h 00m

Lambert-St Louis

Wed 6/24

10:25 am-7:00 am

2 stops29h 35m

$1,031

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/11

9:20 am-4:33 pm

2 stops22h 13m

Lambert-St Louis

Wed 6/17

4:48 pm-7:20 am

2 stops23h 32m

$1,036

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 6/3

9:10 am-1:52 pm

2 stops43h 42m

Lambert-St Louis

Sun 6/7

7:04 am-6:55 am

1 stop32h 51m

$1,045

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/4

9:10 am-11:56 pm

1 stop29h 46m

Lambert-St Louis

Sat 6/13

6:35 am-7:05 am

1 stop33h 30m

$1,054
Quickest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/12

12:00 pm-4:41 pm

1 stop19h 41m

Lambert-St Louis

Sat 9/5

5:11 pm-6:55 am

1 stop22h 44m

$1,059

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 6/3

9:10 am-11:56 pm

1 stop29h 46m

Lambert-St Louis

Sun 6/7

2:58 pm-6:25 am

2 stops24h 27m

$1,060

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/4

12:00 pm-4:33 pm

1 stop19h 33m

Lambert-St Louis

Sat 6/13

1:41 pm-7:05 am

2 stops26h 24m

$1,066

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 5/31

9:10 am-8:32 am

2 stops38h 22m

Lambert-St Louis

Wed 6/3

7:03 am-6:55 am

1 stop32h 52m

$1,070

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/12

10:20 am-6:39 pm

1 stop23h 19m

Lambert-St Louis

Sat 9/5

3:13 pm-7:00 am

2 stops24h 47m

$1,081

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 $948. The month of May is another great option to travel to St. Louis, with average flight prices from Sydney averaging around $1,151.

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

You could potentially save up to 4% 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

27h 00m

Direct flights

None
The fastest flight from Sydney to St. Louis takes 27h 00m
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 27h 00m 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
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Festus
Eureka
Clayton
Litchfield
Edwardsville
Shrewsbury
Grafton

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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