What is the cheapest airline that flies from Australia to Lambert-St Louis?

United Airlines, American Airlines, and Qantas Airways are the most popular carriers operating from Australia to Lambert-St Louis

How long does it take to fly to St. Louis?

Flight times from Australia to St. Louis vary, but if you’re flying out of Sydney and flying into St. Louis (one of the most popular routes), then the duration is 22h 57m on average. Another popular route from Australia to St. Louis is flying from Melbourne to St. Louis, which will take roughly 24h 59m. Keep in mind that layovers or delays could extend your travel time.

When did momondo last update prices for flights from Australia to Lambert-St Louis Airport?

Prices for flights from Australia to Lambert-St Louis Airport are updated daily.

How many operators does momondo search for flights from Australia to Lambert-St Louis Airport?

As of September 2025, there are 2 operators available to choose from for flights from Australia to Lambert-St Louis Airport.

How old do you have to be to fly from Australia to Lambert-St Louis Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Australia to Lambert-St Louis Airport.

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$510 Cheap Flights from Australia to St. Louis in 2025/26

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Find the cheapest flights from Australia to St. Louis

Round-trip

One-way

Recent round-trip flight deals from Australia to St. Louis

10:20 am - 3:29 pmSYD-STL

45h 09m2 stops

4:05 pm - 8:35 amSTL-SYD

48h 30m2 stops

$810Air Canada

Find Deal

Thu, Mar 12 - Mon, Mar 16

10:20 am - 3:29 pmSYD-STL

45h 09m2 stops

1:30 pm - 8:35 amSTL-SYD

27h 05m2 stops

$817Air Canada

Find Deal

Thu, Mar 12 - Mon, Mar 16

11:20 am - 12:42 amSYD-STL

29h 22m1 stop

7:00 am - 9:00 amSTL-SYD

33h 00m1 stop

$845American Airlines

Find Deal

Sun, Nov 2 - Sun, Nov 9

12:00 pm - 4:27 pmMEL-STL

20h 27m1 stop

9:00 am - 10:00 amSTL-MEL

32h 00m2 stops

$846United Airlines

Find Deal

Sat, Nov 1 - Sat, Nov 8

11:20 am - 12:42 amSYD-STL

29h 22m1 stop

2:29 pm - 9:00 amSTL-SYD

25h 31m2 stops

$849American Airlines

Find Deal

Sun, Nov 2 - Sun, Nov 9

11:50 am - 3:50 pmSYD-STL

20h 00m1 stop

4:43 pm - 9:15 amSTL-SYD

47h 32m2 stops

$852United Airlines

Find Deal

Fri, Oct 31 - Fri, Nov 7

7:00 pm - 4:29 pmMEL-STL

61h 29m3 stops

4:05 pm - 6:35 pmSTL-MEL

57h 30m3 stops

$974Multiple Airlines

Find Deal

Sat, Nov 1 - Sat, Nov 8

11:45 am - 6:47 pmSYD-STL

23h 02m2 stops

9:00 am - 8:45 amSTL-SYD

30h 45m3 stops

$1,293Multiple Airlines

Find Deal

Fri, Oct 31 - Fri, Nov 7

12:00 pm - 11:05 pmMEL-STL

27h 05m1 stop

6:03 pm - 5:00 amSTL-MEL

41h 57m1 stop

$1,768Qantas Airways

Find Deal

Sat, Nov 1 - Sat, Nov 8

11:00 am - 11:42 pmLST-STL

29h 42m2 stops

7:00 am - 7:50 pmSTL-LST

43h 50m2 stops

$2,243Qantas Airways

Find Deal

Thu, Nov 20 - Mon, Nov 24

Air Canada flights from Australia to St. Louis

Our best Air Canada deals on Australia 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

$810

Find similar

Air Canada

Mar 12

SYD10:20 amSydney Kingsford Smith

45h 09m

2 stops

STL3:29 pmLambert-St Louis

Mar 16

STL1:30 pmLambert-St Louis

27h 05m

2 stops

SYD8:35 amSydney Kingsford Smith

$817

Find similar

Air Canada

Mar 12

SYD10:20 amSydney Kingsford Smith

45h 09m

2 stops

STL3:29 pmLambert-St Louis

Mar 16

STL1:30 pmLambert-St Louis

27h 05m

2 stops

SYD8:35 amSydney Kingsford Smith

$818

Find similar

Cathay Pacific flights from Australia to St. Louis

Our best Cathay Pacific deals on Australia to St. Louis flight tickets

Cathay Pacific

Mar 5

MEL12:45 amMelbourne

34h 11m

2 stops

STL5:56 pmLambert-St Louis

Mar 10

STL5:59 pmLambert-St Louis

37h 01m

2 stops

MEL11:00 pmMelbourne

$1,835

Find similar

Cathay Pacific

Oct 31

MEL12:45 amMelbourne

33h 26m

2 stops

STL6:11 pmLambert-St Louis

Nov 8

STL8:39 amLambert-St Louis

34h 51m

2 stops

MEL12:30 pmMelbourne

$10,831

Find similar

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

$810

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

1:30 pm-8:35 am

2 stops27h 05m

$817

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 11/2

11:20 am-12:42 am

1 stop29h 22m

Lambert-St Louis

Sun 11/9

7:00 am-9:00 am

1 stop33h 00m

$845

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sat 11/1

12:00 pm-4:27 pm

1 stop20h 27m

Lambert-St Louis

Sat 11/8

9:00 am-10:00 am

2 stops32h 00m

$846

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 11/2

11:20 am-12:42 am

1 stop29h 22m

Lambert-St Louis

Sun 11/9

2:29 pm-9:00 am

2 stops25h 31m

$849

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 10/31

11:50 am-3:50 pm

1 stop20h 00m

Lambert-St Louis

Fri 11/7

4:43 pm-9:15 am

2 stops47h 32m

$852

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sat 11/1

7:00 pm-4:29 pm

3 stops61h 29m

Lambert-St Louis

Sat 11/8

4:05 pm-6:35 pm

3 stops57h 30m

$974

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 10/31

11:45 am-6:47 pm

2 stops23h 02m

Lambert-St Louis

Fri 11/7

9:00 am-8:45 am

3 stops30h 45m

$1,293

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sat 11/1

12:00 pm-11:05 pm

1 stop27h 05m

Lambert-St Louis

Sat 11/8

6:03 pm-5:00 am

1 stop41h 57m

$1,768

LauncestonSt. Louis

LST - STL

LSTSTL

Launceston

Thu 11/20

11:00 am-11:42 pm

2 stops29h 42m

Lambert-St Louis

Mon 11/24

7:00 am-7:50 pm

2 stops43h 50m

$2,243

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Australia 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

Prices

Airlines

Other information

What is the cheapest month to fly to St. Louis?

In general, November is the cheapest month to fly from Australia 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 Australia 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 Australia 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 Australia to St. Louis flights?

You could potentially save up to 51% on your flight if you consider stops on a Australia to St. Louis flight.

Cheap Australia to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Australia to St. Louis

Direct flights	None

There are no direct flights from Australia to St. Louis. There are no popular flight routes from Australia to St. Louis.

Search flight deals

When did momondo last update prices for flights from Australia to Lambert-St Louis Airport?
Prices for flights from Australia to Lambert-St Louis Airport are updated daily.
How many operators does momondo search for flights from Australia to Lambert-St Louis Airport?
As of September 2025, there are 2 operators available to choose from for flights from Australia to Lambert-St Louis Airport.
How old do you have to be to fly from Australia to Lambert-St Louis Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Australia to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Australia to St. Louis

Compare and see reviews for airlines that fly from Australia to St. Louis with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $822	Free Cancellation	Rating 7.4 8,926 reviews		Search United Airlines flights
Qantas Airways	PriceFrom $1,110	Free Cancellation	Rating 7.5 907 reviews		Search Qantas Airways flights

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Chesterfield

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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 Australia to St. Louis?

It is quick and easy to find Australia to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

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

Yes. momondo enables you to select and highlight flights to St. Louis from Australia with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Australia.

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

Price alerts on flights to St. Louis from Australia are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.