Which airlines fly to St. Louis?

When flying to St. Louis from Australia, momondo travellers will most often fly with one of these popular airlines: United Airlines, Qantas Airways orAir Canada. Depending on what airport in Australia you fly from, you may be able to find flights with any of these popular airlines.

Qantas Airways Flights to St. Louis

5 Qantas Airways flights head to St. Louis on average each week. Most will be flying from Dallas/Fort Worth to St. Louis, the most popular route that Qantas Airways operates to St. Louis. Prices vary based on when and where you fly from - the cheapest Qantas Airways flight to St. Louis found in the past 3 days on momondo was $1,507, departing from Adelaide. Qantas Airways is the most popular choice on momondo for this route and has been scored 7.5/10 by 926 of our users.

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

The flight from Australia to St. Louis depends on which airports you’re departing from and arriving to, and whether or not you have a layover. If you fly from Sydney Kingsford Smith (a popular airport in Australia) to Lambert-St Louis (the most popular airport in St. Louis), then the flight time is 23h 12m on average. If you fly from Melbourne (another popular airport in Australia) to Lambert-St Louis, then the average flight time is 21h 56m.

$863 Cheap Flights to St. Louis in 2025/26

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Find the cheapest flights from Australia to St. Louis

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10:25 - 15:29SYD-STL

45h 04m2 stops

15:00 - 08:35STL-SYD

25h 35m2 stops

$1,337Air Canada

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Thu, 12 Mar - Mon, 16 Mar

10:25 - 15:29SYD-STL

45h 04m2 stops

16:05 - 08:35STL-SYD

48h 30m2 stops

$1,340Air Canada

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Thu, 12 Mar - Mon, 16 Mar

11:20 - 23:42SYD-STL

29h 22m1 stop

07:00 - 09:00STL-SYD

33h 00m1 stop

$1,483American Airlines

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Mon, 24 Nov - Sun, 30 Nov

11:50 - 17:39SYD-STL

22h 49m2 stops

11:20 - 07:00STL-SYD

26h 40m1 stop

$1,509United Airlines

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Mon, 24 Nov - Sun, 30 Nov

11:30 - 16:52MEL-STL

22h 22m2 stops

16:35 - 09:00STL-MEL

48h 25m2 stops

$1,648United Airlines

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Fri, 6 Mar - Tue, 10 Mar

16:05 - 19:26MEL-STL

20h 21m1 stop

17:59 - 05:00STL-MEL

43h 01m1 stop

$1,705American Airlines

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Fri, 6 Mar - Tue, 10 Mar

10:10 - 18:04MEL-STL

24h 54m2 stops

17:30 - 07:00STL-MEL

45h 30m2 stops

$1,712Delta

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Fri, 6 Mar - Tue, 10 Mar

14:15 - 21:35SYD-STL

24h 20m2 stops

06:00 - 06:35STL-SYD

33h 35m2 stops

$2,414Delta

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Sat, 10 Jan - Sun, 7 Jun

17:45 - 23:57SYD-STL

23h 12m1 stop

06:20 - 07:25STL-SYD

32h 05m1 stop

$2,720Qantas Airways

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Sun, 14 Dec - Sun, 21 Dec

09:45 - 23:09MEL-STL

28h 24m1 stop

06:30 - 06:45STL-MEL

33h 15m1 stop

$2,864Qantas Airways

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Sun, 5 Apr - Sat, 11 Apr

Fly from

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

10:25-15:29

2 stops45h 04m

Lambert-St Louis

Mon 16/3

15:00-08:35

2 stops25h 35m

$1,337

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

10:25-15:29

2 stops45h 04m

Lambert-St Louis

Mon 16/3

16:05-08:35

2 stops48h 30m

$1,340

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:20-23:42

1 stop29h 22m

Lambert-St Louis

Sun 30/11

07:00-09:00

1 stop33h 00m

$1,483

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:50-17:39

2 stops22h 49m

Lambert-St Louis

Sun 30/11

11:20-07:00

1 stop26h 40m

$1,509

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Fri 6/3

11:30-16:52

2 stops22h 22m

Lambert-St Louis

Tue 10/3

16:35-09:00

2 stops48h 25m

$1,648

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Fri 6/3

16:05-19:26

1 stop20h 21m

Lambert-St Louis

Tue 10/3

17:59-05:00

1 stop43h 01m

$1,705

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Fri 6/3

10:10-18:04

2 stops24h 54m

Lambert-St Louis

Tue 10/3

17:30-07:00

2 stops45h 30m

$1,712

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 10/1

14:15-21:35

2 stops24h 20m

Lambert-St Louis

Sun 7/6

06:00-06:35

2 stops33h 35m

$2,414

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 14/12

17:45-23:57

1 stop23h 12m

Lambert-St Louis

Sun 21/12

06:20-07:25

1 stop32h 05m

$2,720

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sun 5/4

09:45-23:09

1 stop28h 24m

Lambert-St Louis

Sat 11/4

06:30-06:45

1 stop33h 15m

$2,864

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

St. Louis flights insights and trends

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Prices

Other information

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

The month of November is, on average, the cheapest month to fly to St. Louis from Australia, with most prices found around $1,570. If you aren’t able to travel to St. Louis during the month of November, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $1,718.

What is the cheapest day to depart on your flight to St. Louis?

According to our data, Saturday is the cheapest day to fly to St. Louis from Australia. The lowest ticket price found for a Saturday departure recently was $2,127. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Australia to St. Louis on a Thursday will generally be more expensive and average around $2,725. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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 $2,178 when looking at flights departing in the morning. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $3,163 per ticket.

Cheapest flights to Lambert-St Louis

Find the cheapest flights to Lambert-St Louis from your nearest city or airport

Find flights from Sydney to St. Louis

CHEAPEST MONTH TO FLY TO ST. LOUIS FROM SYDNEY	November	23% cheaper	Flying from Sydney to St. Louis costs on average just $1,570 in November
MOST EXPENSIVE MONTH TO FLY TO ST. LOUIS FROM SYDNEY	December	21% more expensive	It costs about $2,465 for flights to St. Louis from Sydney in December
MOST POPULAR MONTH TO FLY TO ST. LOUIS FROM SYDNEY	December	377% more users visited	More momondo users searched in flights to St. Louis from Sydney in December than any other month

Cheap St. Louis flight deals and tips

Summary info about St. Louis flight prices, duration and airlines

Best One-Way Price	$863
Best Round-Trip Price	$1,337
Fastest flight time	19h 44m
Popular in	July

The best one-way flight price to St. Louis from Australia in the last 72 hours is $863 (Melbourne to Lambert-St Louis).

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The best round-trip flight price to St. Louis from Australia in the last 72 hours is $1,337 (Sydney Kingsford Smith to Lambert-St Louis).

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The fastest flight to St. Louis from Australia takes 19h 44m (Sydney Kingsford Smith to Lambert-St Louis).

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July has the highest demand for flights to St. Louis, with a 4% price increase on average.

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Frequently asked questions about flying to St. Louis

Is there an alternative airport near St. Louis?

Those flying to St. Louis could potentially find better pricing at Belleville Airport (35 km from St. Louis city centre), Marion Williamson County Airport (142 km from St. Louis city centre) or Springfield Capital Airport (142 km from St. Louis city centre) depending on the month and departure airport.

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

Prices for flights to Lambert-St Louis Airport were last updated today.

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

As of October 2025, there are 4 operators available to choose from for flights to Lambert-St Louis Airport.

How old do you have to be to fly 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 stopovers. It is recommended that you verify with the airline you are booking with for travel 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.

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

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

Flights 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 to St. Louis?

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

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