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Cheap flights from Sydney to St. Louis from $1,427

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Sydney to St. Louis departing on 1/5. 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

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Find the cheapest flights from Sydney to St. Louis

Cheap return flights

Enter your travel dates to find the best prices.
Air Canada Logo
09:20 - 20:04
SYD
-
STL
49h 44m
2 stops
Air Canada Logo
14:20 - 07:20
STL
-
SYD
50h 00m
2 stops
$1,427Air Canada
Fri, 1 May - Sun, 24 May
Air Canada Logo
09:20 - 14:02
SYD
-
STL
43h 42m
2 stops
Air Canada Logo
08:55 - 07:20
STL
-
SYD
55h 25m
2 stops
$1,459Air Canada
Mon, 3 Aug - Wed, 26 Aug
American Airlines Logo
17:50 - 23:59
SYD
-
STL
21h 09m
1 stop
American Airlines Logo
16:18 - 07:05
STL
-
SYD
23h 47m
2 stops
$1,495American Airlines
Mon, 3 Aug - Wed, 26 Aug
United Airlines Logo
09:30 - 00:29
SYD
-
STL
29h 59m
2 stops
United Airlines Logo
19:06 - 06:55
STL
-
SYD
20h 49m
1 stop
$1,503United Airlines
Tue, 30 Jun - Wed, 22 Jul
United Airlines Logo
10:20 - 17:53
SYD
-
STL
22h 33m
1 stop
United Airlines Logo
19:06 - 06:55
STL
-
SYD
20h 49m
1 stop
$1,510United Airlines
Mon, 29 Jun - Wed, 22 Jul
United Airlines Logo
09:30 - 22:37
SYD
-
STL
28h 07m
2 stops
United Airlines Logo
14:50 - 07:00
STL
-
SYD
25h 10m
2 stops
$1,512United Airlines
Mon, 29 Jun - Mon, 6 Jul
American Airlines Logo
12:00 - 16:33
SYD
-
STL
19h 33m
1 stop
American Airlines Logo
16:18 - 07:05
STL
-
SYD
23h 47m
2 stops
$1,546American Airlines
Wed, 15 Jul - Fri, 7 Aug
Air Canada Logo
10:20 - 15:29
SYD
-
STL
45h 09m
2 stops
Air Canada Logo
16:05 - 08:35
STL
-
SYD
48h 30m
2 stops
$1,547Air Canada
Fri, 13 Mar - Fri, 20 Mar
United Airlines Logo
09:30 - 23:58
SYD
-
STL
29h 28m
2 stops
United Airlines Logo
19:06 - 06:55
STL
-
SYD
20h 49m
1 stop
$1,551United Airlines
Mon, 29 Jun - Thu, 23 Jul
United Airlines Logo
10:20 - 17:53
SYD
-
STL
22h 33m
1 stop
United Airlines Logo
19:06 - 06:55
STL
-
SYD
20h 49m
1 stop
$1,561United Airlines
Mon, 29 Jun - Thu, 23 Jul

Delta flights from Sydney to St. Louis

Our best Delta deals on Sydney to St. Louis flight tickets
Delta
30 Mar
SYD10:15Sydney Kingsford Smith
30h 06m
2 stops
STL00:21Lambert-St Louis
6 Apr
STL10:50Lambert-St Louis
29h 00m
2 stops
SYD06:50Sydney Kingsford Smith
$2,020
Delta
29 June
SYD09:15Sydney Kingsford Smith
37h 52m
2 stops
STL08:07Lambert-St Louis
22 July
STL06:00Lambert-St Louis
33h 50m
2 stops
SYD06:50Sydney Kingsford Smith
$2,040

United Airlines flights from Sydney to St. Louis

Our best United Airlines deals on Sydney to St. Louis flight tickets
United Airlines
30 June
SYD09:30Sydney Kingsford Smith
29h 59m
2 stops
STL00:29Lambert-St Louis
22 July
STL19:06Lambert-St Louis
20h 49m
1 stop
SYD06:55Sydney Kingsford Smith
$1,503
United Airlines
29 June
SYD10:20Sydney Kingsford Smith
22h 33m
1 stop
STL17:53Lambert-St Louis
22 July
STL19:06Lambert-St Louis
20h 49m
1 stop
SYD06:55Sydney Kingsford Smith
$1,510
United Airlines
29 June
SYD09:30Sydney Kingsford Smith
28h 07m
2 stops
STL22:37Lambert-St Louis
6 July
STL14:50Lambert-St Louis
25h 10m
2 stops
SYD07:00Sydney Kingsford Smith
$1,512

momondo Fare Finder

 
Customise 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 78,305 searches. Data last updated 15 February 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

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 1/5

09:20-20:04

2 stops49h 44m

Lambert-St Louis

Sun 24/5

14:20-07:20

2 stops50h 00m

$1,427

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 3/8

09:20-14:02

2 stops43h 42m

Lambert-St Louis

Wed 26/8

08:55-07:20

2 stops55h 25m

$1,459

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 3/8

17:50-23:59

1 stop21h 09m

Lambert-St Louis

Wed 26/8

16:18-07:05

2 stops23h 47m

$1,495

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 30/6

09:30-00:29

2 stops29h 59m

Lambert-St Louis

Wed 22/7

19:06-06:55

1 stop20h 49m

$1,503

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 29/6

10:20-17:53

1 stop22h 33m

Lambert-St Louis

Wed 22/7

19:06-06:55

1 stop20h 49m

$1,510

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 29/6

09:30-22:37

2 stops28h 07m

Lambert-St Louis

Mon 6/7

14:50-07:00

2 stops25h 10m

$1,512

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 15/7

12:00-16:33

1 stop19h 33m

Lambert-St Louis

Fri 7/8

16:18-07:05

2 stops23h 47m

$1,546

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 13/3

10:20-15:29

2 stops45h 09m

Lambert-St Louis

Fri 20/3

16:05-08:35

2 stops48h 30m

$1,547

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 29/6

09:30-23:58

2 stops29h 28m

Lambert-St Louis

Thu 23/7

19:06-06:55

1 stop20h 49m

$1,551

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 29/6

10:20-17:53

1 stop22h 33m

Lambert-St Louis

Thu 23/7

19:06-06:55

1 stop20h 49m

$1,561

Flights are sorted by cheapest return 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 cheapest month to fly to St. Louis?

The month of August is, on average, the cheapest month to fly to St. Louis from Sydney, with most prices found around $1,629. If you aren’t able to travel to St. Louis during the month of August, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $1,676.

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

You could potentially save up to 8% 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 return 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

21h 48m

Direct flights

None
The fastest flight from Sydney to St. Louis takes 21h 48m
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?

    Sydney Kingsford Smith and Lambert-St Louis are 14576.1 km apart from one another. By plane, this route typically takes 21h 48m.

  • 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 refresh 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 stopovers 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 necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted 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
United AirlinesPriceFrom $1,177Free cancellationRating
7.4
9,294 reviews
Search United Airlines flights
Air CanadaPriceFrom $1,390Free cancellationRating
7.1
10,720 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $1,715Free cancellationRating
7.5
989 reviews
Search Qantas Airways flights

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Chesterfield

Why use momondo?

Why should I use momondo to find a flight deal from Sydney to St. Louis?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Sydney.

Can I find flights from Sydney to St. Louis with flexible booking policies on momondo?

Flights from Sydney to St. Louis with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Sydney to St. Louis?

Once you have performed a search for Sydney to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Sydney to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from Sydney. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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