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Cheap flights from Sydney to St. Louis from $509

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 3/7. 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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0 bags

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Find the cheapest flights from Sydney to St. Louis

Cheap round-trip flights

Air Canada Logo
10:20 am - 3:29 pmSYD-STL
45h 09m2 stops
Air Canada Logo
4:05 pm - 8:35 amSTL-SYD
48h 30m2 stops
$809Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
Air Canada Logo
10:20 am - 3:29 pmSYD-STL
45h 09m2 stops
Air Canada Logo
4:05 pm - 8:35 amSTL-SYD
48h 30m2 stops
$810Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
American Airlines Logo
11:20 am - 10:22 pmSYD-STL
28h 02m2 stops
American Airlines Logo
6:55 am - 9:00 amSTL-SYD
33h 05m1 stop
$833American Airlines
Find Deal
Wed, Dec 3 - Fri, Dec 12
American Airlines Logo
11:20 am - 5:38 pmSYD-STL
22h 18m2 stops
American Airlines Logo
2:29 pm - 9:00 amSTL-SYD
25h 31m2 stops
$845American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
11:50 am - 10:04 amSYD-STL
39h 14m1 stop
United Airlines Logo
4:45 pm - 7:00 amSTL-SYD
21h 15m1 stop
$850United Airlines
Find Deal
Mon, Dec 1 - Tue, Dec 9
United Airlines Logo
11:50 am - 10:45 pmSYD-STL
27h 55m2 stops
United Airlines Logo
9:00 am - 9:15 amSTL-SYD
31h 15m2 stops
$851United Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Delta Logo
10:40 am - 11:28 pmSYD-STL
53h 48m2 stops
Delta Logo
6:00 am - 8:30 amSTL-SYD
33h 30m2 stops
$1,027Delta
Find Deal
Wed, Dec 3 - Thu, Dec 11
Qantas Airways Logo
2:05 pm - 4:32 pmSYD-STL
19h 27m1 stop
Qantas Airways Logo
1:20 pm - 6:55 amSTL-SYD
24h 35m1 stop
$1,081Qantas Airways
Find Deal
Sun, Nov 30 - Mon, Dec 8
Qantas Airways Logo
2:05 pm - 4:34 pmSYD-STL
19h 29m1 stop
Qantas Airways Logo
1:20 pm - 6:55 amSTL-SYD
24h 35m1 stop
$1,200Qantas Airways
Find Deal
Wed, Dec 3 - Wed, Dec 10
Delta Logo
10:40 am - 11:23 pmSYD-STL
53h 43m2 stops
Delta Logo
9:00 am - 8:30 amSTL-SYD
30h 30m2 stops
$1,403Delta
Find Deal
Sun, Nov 30 - Sun, Dec 7

Air Canada flights from Sydney to St. Louis

Our best Air Canada deals on Sydney to St. Louis flight tickets
Air Canada
Mar 12
SYD10:20 amSydney Kingsford Smith
45h 09m
2 stops
STL3:29 pmLambert-St Louis
Mar 16
STL4:05 pmLambert-St Louis
48h 30m
2 stops
SYD8:35 amSydney Kingsford Smith
$809
Find similar
Air Canada
Mar 12
SYD10:20 amSydney Kingsford Smith
45h 09m
2 stops
STL3:29 pmLambert-St Louis
Mar 16
STL4:05 pmLambert-St Louis
48h 30m
2 stops
SYD8:35 amSydney Kingsford Smith
$810
Find similar
Air Canada
Dec 4
SYD4:00 pmSydney Kingsford Smith
64h 29m
2 stops
STL3:29 pmLambert-St Louis
Dec 10
STL1:35 pmLambert-St Louis
48h 20m
2 stops
SYD6:55 amSydney Kingsford Smith
$830
Find similar

United Airlines flights from Sydney to St. Louis

Our best United Airlines deals on Sydney to St. Louis flight tickets
United Airlines
Dec 1
SYD11:50 amSydney Kingsford Smith
39h 14m
1 stop
STL10:04 amLambert-St Louis
Dec 9
STL4:45 pmLambert-St Louis
21h 15m
1 stop
SYD7:00 amSydney Kingsford Smith
$850
Find similar
United Airlines
Dec 3
SYD11:50 amSydney Kingsford Smith
27h 55m
2 stops
STL10:45 pmLambert-St Louis
Dec 10
STL9:00 amLambert-St Louis
31h 15m
2 stops
SYD9:15 amSydney Kingsford Smith
$851
Find similar
United Airlines
Dec 3
SYD11:20 amSydney Kingsford Smith
22h 08m
2 stops
STL4:28 pmLambert-St Louis
Dec 7
STL5:30 pmLambert-St Louis
22h 45m
1 stop
SYD9:15 amSydney Kingsford Smith
$957
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 September 16, 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

Thu 3/12

10:20 am-3:29 pm

2 stops45h 09m

Lambert-St Louis

Mon 3/16

4:05 pm-8:35 am

2 stops48h 30m

$809

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

10:20 am-3:29 pm

2 stops45h 09m

Lambert-St Louis

Mon 3/16

4:05 pm-8:35 am

2 stops48h 30m

$810

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 12/3

11:20 am-10:22 pm

2 stops28h 02m

Lambert-St Louis

Fri 12/12

6:55 am-9:00 am

1 stop33h 05m

$833

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 10/30

11:20 am-5:38 pm

2 stops22h 18m

Lambert-St Louis

Thu 11/6

2:29 pm-9:00 am

2 stops25h 31m

$845

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 12/1

11:50 am-10:04 am

1 stop39h 14m

Lambert-St Louis

Tue 12/9

4:45 pm-7:00 am

1 stop21h 15m

$850

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 12/3

11:50 am-10:45 pm

2 stops27h 55m

Lambert-St Louis

Wed 12/10

9:00 am-9:15 am

2 stops31h 15m

$851

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 12/3

10:40 am-11:28 pm

2 stops53h 48m

Lambert-St Louis

Thu 12/11

6:00 am-8:30 am

2 stops33h 30m

$1,027

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 11/30

2:05 pm-4:32 pm

1 stop19h 27m

Lambert-St Louis

Mon 12/8

1:20 pm-6:55 am

1 stop24h 35m

$1,081

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 12/3

2:05 pm-4:34 pm

1 stop19h 29m

Lambert-St Louis

Wed 12/10

1:20 pm-6:55 am

1 stop24h 35m

$1,200

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 11/30

10:40 am-11:23 pm

2 stops53h 43m

Lambert-St Louis

Sun 12/7

9:00 am-8:30 am

2 stops30h 30m

$1,403

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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, 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 $1,031. The month of August is another great option to travel to St. Louis, with average flight prices from Sydney averaging around $1,128.

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 68% 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

Direct flights

None
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 19h 22m 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
907 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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
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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