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Cheap flights from Sydney to St. Louis from $778

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Sydney to St. Louis departing on 10/15. 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

Air Canada Logo
10:20 am - 8:46 pmSYD-STL
26h 26m2 stops
Air Canada Logo
1:40 pm - 8:20 amSTL-SYD
26h 40m2 stops
$778Air Canada
Find Deal
Wed, Oct 15 - Tue, Oct 21
Air Canada Logo
10:20 am - 3:18 pmSYD-STL
44h 58m2 stops
Air Canada Logo
5:15 am - 8:20 amSTL-SYD
35h 05m2 stops
$792Air Canada
Find Deal
Mon, Oct 13 - Tue, Oct 21
American Airlines Logo
9:10 am - 7:09 pmSYD-STL
24h 59m2 stops
American Airlines Logo
1:20 pm - 9:00 amSTL-SYD
26h 40m2 stops
$810American Airlines
Find Deal
Mon, Aug 18 - Sat, Nov 8
American Airlines Logo
9:10 am - 7:09 pmSYD-STL
24h 59m2 stops
American Airlines Logo
3:59 pm - 9:00 amSTL-SYD
24h 01m2 stops
$814American Airlines
Find Deal
Mon, Aug 18 - Sat, Nov 8
United Airlines Logo
10:20 am - 4:53 pmSYD-STL
21h 33m1 stop
United Airlines Logo
5:49 pm - 6:55 amSTL-SYD
22h 06m1 stop
$826United Airlines
Find Deal
Mon, Sep 15 - Mon, Sep 22
United Airlines Logo
10:20 am - 4:45 pmSYD-STL
21h 25m1 stop
United Airlines Logo
4:48 pm - 7:00 amSTL-SYD
21h 12m1 stop
$827United Airlines
Find Deal
Mon, Aug 18 - Sat, Nov 8
Qantas Airways Logo
1:10 pm - 8:53 pmSYD-STL
23h 43m1 stop
Qantas Airways Logo
5:09 pm - 6:55 amSTL-SYD
21h 46m1 stop
$1,028Qantas Airways
Find Deal
Wed, Oct 15 - Tue, Oct 21
Qantas Airways Logo
10:10 am - 11:05 pmSYD-STL
28h 55m1 stop
Qantas Airways Logo
6:39 am - 8:05 amSTL-SYD
33h 26m1 stop
$1,065Qantas Airways
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Mon, Oct 13 - Tue, Oct 21
Logo
9:55 am - 6:57 pmSYD-STL
25h 02m2 stops
Logo
9:00 am - 8:45 amSTL-SYD
31h 45m3 stops
$1,189
Find Deal
Wed, Oct 15 - Tue, Oct 21
Logo
9:20 am - 6:58 pmSYD-STL
24h 38m2 stops
Logo
1:30 pm - 7:20 amSTL-SYD
50h 50m3 stops
$1,483
Find Deal
Mon, Sep 15 - Mon, Sep 22

Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
Oct 15
SYD10:20 amSydney Kingsford Smith
26h 26m
2 stops
STL8:46 pmLambert-St Louis
Oct 21
STL1:40 pmLambert-St Louis
26h 40m
2 stops
SYD8:20 amSydney Kingsford Smith
$778
Find similar
Air Canada
Oct 13
SYD10:20 amSydney Kingsford Smith
44h 58m
2 stops
STL3:18 pmLambert-St Louis
Oct 21
STL5:15 amLambert-St Louis
35h 05m
2 stops
SYD8:20 amSydney Kingsford Smith
$792
Find similar
Air Canada
Oct 14
SYD10:20 amSydney Kingsford Smith
50h 26m
2 stops
STL8:46 pmLambert-St Louis
Oct 20
STL4:05 pmLambert-St Louis
48h 15m
2 stops
SYD8:20 amSydney Kingsford Smith
$798
Find similar

American Airlines flights from Sydney to St. Louis

Our best American Airlines deals on Sydney to St. Louis flight tickets
American Airlines
Aug 18
SYD9:10 amSydney Kingsford Smith
24h 59m
2 stops
STL7:09 pmLambert-St Louis
Nov 8
STL1:20 pmLambert-St Louis
26h 40m
2 stops
SYD9:00 amSydney Kingsford Smith
$810
Find similar
American Airlines
Aug 18
SYD9:10 amSydney Kingsford Smith
24h 59m
2 stops
STL7:09 pmLambert-St Louis
Nov 8
STL3:59 pmLambert-St Louis
24h 01m
2 stops
SYD9:00 amSydney Kingsford Smith
$814
Find similar
American Airlines
Aug 18
SYD9:10 amSydney Kingsford Smith
28h 59m
1 stop
STL11:09 pmLambert-St Louis
Nov 8
STL3:59 pmLambert-St Louis
24h 01m
2 stops
SYD9:00 amSydney Kingsford Smith
$823
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 August 2, 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 10/15

10:20 am-8:46 pm

2 stops26h 26m

Lambert-St Louis

Tue 10/21

1:40 pm-8:20 am

2 stops26h 40m

$778

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 10/13

10:20 am-3:18 pm

2 stops44h 58m

Lambert-St Louis

Tue 10/21

5:15 am-8:20 am

2 stops35h 05m

$792

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

9:10 am-7:09 pm

2 stops24h 59m

Lambert-St Louis

Sat 11/8

1:20 pm-9:00 am

2 stops26h 40m

$810

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

9:10 am-7:09 pm

2 stops24h 59m

Lambert-St Louis

Sat 11/8

3:59 pm-9:00 am

2 stops24h 01m

$814

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 9/15

10:20 am-4:53 pm

1 stop21h 33m

Lambert-St Louis

Mon 9/22

5:49 pm-6:55 am

1 stop22h 06m

$826

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

10:20 am-4:45 pm

1 stop21h 25m

Lambert-St Louis

Sat 11/8

4:48 pm-7:00 am

1 stop21h 12m

$827

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/15

1:10 pm-8:53 pm

1 stop23h 43m

Lambert-St Louis

Tue 10/21

5:09 pm-6:55 am

1 stop21h 46m

$1,028

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 10/13

10:10 am-11:05 pm

1 stop28h 55m

Lambert-St Louis

Tue 10/21

6:39 am-8:05 am

1 stop33h 26m

$1,065

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/15

9:55 am-6:57 pm

2 stops25h 02m

Lambert-St Louis

Tue 10/21

9:00 am-8:45 am

3 stops31h 45m

$1,189

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 9/15

9:20 am-6:58 pm

2 stops24h 38m

Lambert-St Louis

Mon 9/22

1:30 pm-7:20 am

3 stops50h 50m

$1,483

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 $1,065. The month of March is another great option to travel to St. Louis, with average flight prices from Sydney averaging around $1,196.

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 29% 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

Best Price Found

$778

Fastest flight time

18h 58m

Direct flights

None

Airports in St. Louis

1 airport
The best flight deal from Sydney to St. Louis found on momondo in the last 72 hours is $778
The fastest flight from Sydney to St. Louis takes 18h 58m
There are no direct flights from Sydney to St. Louis. Popular non-direct route for this connection is Sydney Kingsford Smith Airport - Lambert-St Louis Airport.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
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 18h 58m 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
887 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
Fenton
Collinsville
O'Fallon
Alton
St. Peters
Farmington
Wentzville
Festus
Glencoe
Eureka
Edwardsville
Clayton
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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