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Cheap flights from Sydney to St. Louis from $700

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 8/3. 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 round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
9:20 am - 12:06 pm
SYD
-
STL
41h 46m
2 stops
Air Canada Logo
7:05 am - 7:20 am
STL
-
SYD
33h 15m
2 stops
$937Air Canada
Thu, May 7 - Thu, May 14
Air Canada Logo
9:20 am - 12:06 pm
SYD
-
STL
41h 46m
2 stops
Air Canada Logo
1:05 pm - 7:20 am
STL
-
SYD
27h 15m
2 stops
$944Air Canada
Wed, May 20 - Thu, May 28
Air Canada Logo
9:20 am - 2:00 pm
SYD
-
STL
43h 40m
2 stops
Air Canada Logo
8:55 am - 7:20 am
STL
-
SYD
55h 25m
2 stops
$986Air Canada
Sun, Sep 13 - Wed, Sep 23
Air Canada Logo
9:20 am - 12:06 pm
SYD
-
STL
41h 46m
2 stops
Air Canada Logo
1:05 pm - 7:20 am
STL
-
SYD
51h 15m
3 stops
$1,003Air Canada
Thu, May 7 - Thu, May 14
Air Canada Logo
9:20 am - 12:06 pm
SYD
-
STL
41h 46m
2 stops
Air Canada Logo
7:05 am - 7:20 am
STL
-
SYD
33h 15m
2 stops
$1,110Air Canada
Wed, May 20 - Thu, May 28
Qantas Airways Logo
12:00 pm - 4:42 pm
SYD
-
STL
19h 42m
1 stop
Qantas Airways Logo
6:30 am - 7:05 am
STL
-
SYD
33h 35m
1 stop
$1,183Qantas Airways
Sun, Sep 13 - Wed, Sep 23
Air Canada Logo
9:20 am - 12:06 pm
SYD
-
STL
41h 46m
2 stops
Air Canada Logo
1:05 pm - 7:20 am
STL
-
SYD
51h 15m
3 stops
$1,199Air Canada
Wed, May 20 - Thu, May 28
American Airlines Logo
9:10 am - 11:59 pm
SYD
-
STL
29h 49m
1 stop
American Airlines Logo
6:35 am - 7:05 am
STL
-
SYD
33h 30m
1 stop
$1,202American Airlines
Wed, May 20 - Thu, May 28
Qantas Airways Logo
9:10 am - 11:59 pm
SYD
-
STL
29h 49m
1 stop
Qantas Airways Logo
6:21 am - 7:05 am
STL
-
SYD
33h 44m
1 stop
$1,207Qantas Airways
Thu, May 7 - Thu, May 14
Multiple Airlines Logo
9:25 pm - 6:37 pm
SYD
-
STL
36h 12m
2 stops
Multiple Airlines Logo
6:30 am - 7:05 am
STL
-
SYD
33h 35m
1 stop
$1,239Multiple Airlines
Sun, Sep 13 - Wed, Sep 23

Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
May 7
SYD9:20 amSydney Kingsford Smith
41h 46m
2 stops
STL12:06 pmLambert-St Louis
May 14
STL7:05 amLambert-St Louis
33h 15m
2 stops
SYD7:20 amSydney Kingsford Smith
$937
Air Canada
Sep 13
SYD9:20 amSydney Kingsford Smith
43h 40m
2 stops
STL2:00 pmLambert-St Louis
Sep 23
STL8:55 amLambert-St Louis
55h 25m
2 stops
SYD7:20 amSydney Kingsford Smith
$986
Air Canada
May 7
SYD9:20 amSydney Kingsford Smith
41h 46m
2 stops
STL12:06 pmLambert-St Louis
May 14
STL1:05 pmLambert-St Louis
51h 15m
3 stops
SYD7:20 amSydney Kingsford Smith
$1,003

Qantas Airways flights from Sydney to St. Louis

Our best Qantas Airways deals on Sydney to St. Louis flight tickets
Qantas Airways
Sep 13
SYD12:00 pmSydney Kingsford Smith
19h 42m
1 stop
STL4:42 pmLambert-St Louis
Sep 23
STL6:30 amLambert-St Louis
33h 35m
1 stop
SYD7:05 amSydney Kingsford Smith
$1,183
Qantas Airways
May 7
SYD9:10 amSydney Kingsford Smith
29h 49m
1 stop
STL11:59 pmLambert-St Louis
May 14
STL6:21 amLambert-St Louis
33h 44m
1 stop
SYD7:05 amSydney Kingsford Smith
$1,207
Qantas Airways
Aug 7
SYD12:00 pmSydney Kingsford Smith
19h 42m
1 stop
STL4:42 pmLambert-St Louis
Aug 31
STL5:11 pmLambert-St Louis
22h 44m
1 stop
SYD6:55 amSydney Kingsford Smith
$1,390

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 March 28, 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 5/7

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/14

7:05 am-7:20 am

2 stops33h 15m

$937

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/28

1:05 pm-7:20 am

2 stops27h 15m

$944

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 9/13

9:20 am-2:00 pm

2 stops43h 40m

Lambert-St Louis

Wed 9/23

8:55 am-7:20 am

2 stops55h 25m

$986

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 5/7

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/14

1:05 pm-7:20 am

3 stops51h 15m

$1,003

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/28

7:05 am-7:20 am

2 stops33h 15m

$1,110
Quickest round-trip

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 9/13

12:00 pm-4:42 pm

1 stop19h 42m

Lambert-St Louis

Wed 9/23

6:30 am-7:05 am

1 stop33h 35m

$1,183

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:20 am-12:06 pm

2 stops41h 46m

Lambert-St Louis

Thu 5/28

1:05 pm-7:20 am

3 stops51h 15m

$1,199

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/20

9:10 am-11:59 pm

1 stop29h 49m

Lambert-St Louis

Thu 5/28

6:35 am-7:05 am

1 stop33h 30m

$1,202

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 5/7

9:10 am-11:59 pm

1 stop29h 49m

Lambert-St Louis

Thu 5/14

6:21 am-7:05 am

1 stop33h 44m

$1,207

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 9/13

9:25 pm-6:37 pm

2 stops36h 12m

Lambert-St Louis

Wed 9/23

6:30 am-7:05 am

1 stop33h 35m

$1,239

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, May 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 $1,108. The month of August is another great option to travel to St. Louis, with average flight prices from Sydney averaging around $1,128.

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

You could potentially save up to 9% 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

  • 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
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Collinsville
St. Peters
Wentzville
Alton
Fenton
Farmington
Clayton
Festus
Edwardsville
Eureka
Litchfield
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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