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Cheap flights from St. Louis to Sydney from $560

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sydney departing on 1/25. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
7:00 am - 9:00 amSTL-SYD
33h 00m1 stop
Qantas Airways Logo
7:05 am - 11:57 pmSYD-STL
33h 52m2 stops
$960Qantas Airways
Find Deal
Mon, Dec 1 - Sat, Dec 6
Qantas Airways Logo
6:50 pm - 8:50 pmSTL-SYD
33h 00m2 stops
Qantas Airways Logo
11:20 am - 11:09 pmSYD-STL
27h 49m1 stop
$973Qantas Airways
Find Deal
Sun, Mar 1 - Wed, Mar 18
Qantas Airways Logo
5:30 pm - 8:50 pmSTL-SYD
34h 20m2 stops
Qantas Airways Logo
5:45 pm - 11:57 pmSYD-STL
23h 12m1 stop
$980Qantas Airways
Find Deal
Mon, Dec 8 - Wed, Dec 17
Qantas Airways Logo
7:04 am - 9:00 amSTL-SYD
32h 56m1 stop
Qantas Airways Logo
2:35 pm - 11:48 pmSYD-STL
50h 13m2 stops
$1,002Qantas Airways
Find Deal
Mon, Feb 9 - Thu, Feb 26
Qantas Airways Logo
6:30 am - 9:00 amSTL-SYD
33h 30m1 stop
Qantas Airways Logo
5:50 pm - 11:48 pmSYD-STL
46h 58m2 stops
$1,018Qantas Airways
Find Deal
Mon, Feb 16 - Mon, Feb 23
Qantas Airways Logo
1:20 pm - 10:25 pmSTL-SYD
40h 05m2 stops
Qantas Airways Logo
2:05 pm - 7:27 pmSYD-STL
22h 22m1 stop
$1,095Qantas Airways
Find Deal
Fri, Nov 28 - Sun, Dec 14
Multiple Airlines Logo
1:30 pm - 7:20 amSTL-SYD
26h 50m2 stops
Multiple Airlines Logo
9:20 am - 6:25 pmSYD-STL
48h 05m2 stops
$1,099Multiple Airlines
Find Deal
Mon, May 4 - Mon, May 18
Multiple Airlines Logo
1:30 pm - 7:20 amSTL-SYD
26h 50m2 stops
Multiple Airlines Logo
9:20 am - 6:25 pmSYD-STL
48h 05m2 stops
$1,100Multiple Airlines
Find Deal
Mon, May 4 - Mon, May 18
Air Canada Logo
4:05 pm - 7:20 amSTL-SYD
48h 15m2 stops
Air Canada Logo
9:20 am - 6:25 pmSYD-STL
48h 05m2 stops
$1,101Air Canada
Find Deal
Sat, Apr 18 - Tue, May 12
Air Canada Logo
1:30 pm - 7:20 amSTL-SYD
50h 50m3 stops
Air Canada Logo
9:20 am - 6:25 pmSYD-STL
48h 05m2 stops
$1,102Air Canada
Find Deal
Mon, May 4 - Mon, May 18

Qantas Airways flights from St. Louis to Sydney

Our best Qantas Airways deals on St. Louis to Sydney flight tickets
Qantas Airways
Dec 1
STL7:00 amLambert-St Louis
33h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Dec 6
SYD7:05 amSydney Kingsford Smith
33h 52m
2 stops
STL11:57 pmLambert-St Louis
$960
Find similar
Qantas Airways
Mar 1
STL6:50 pmLambert-St Louis
33h 00m
2 stops
SYD8:50 pmSydney Kingsford Smith
Mar 18
SYD11:20 amSydney Kingsford Smith
27h 49m
1 stop
STL11:09 pmLambert-St Louis
$973
Find similar
Qantas Airways
Dec 8
STL5:30 pmLambert-St Louis
34h 20m
2 stops
SYD8:50 pmSydney Kingsford Smith
Dec 17
SYD5:45 pmSydney Kingsford Smith
23h 12m
1 stop
STL11:57 pmLambert-St Louis
$980
Find similar

Air Canada flights from St. Louis to Sydney

Our best Air Canada deals on St. Louis to Sydney flight tickets
Air Canada
Apr 18
STL4:05 pmLambert-St Louis
48h 15m
2 stops
SYD7:20 amSydney Kingsford Smith
May 12
SYD9:20 amSydney Kingsford Smith
48h 05m
2 stops
STL6:25 pmLambert-St Louis
$1,101
Find similar
Air Canada
May 4
STL1:30 pmLambert-St Louis
50h 50m
3 stops
SYD7:20 amSydney Kingsford Smith
May 18
SYD9:20 amSydney Kingsford Smith
48h 05m
2 stops
STL6:25 pmLambert-St Louis
$1,102
Find similar
Air Canada
Feb 16
STL8:41 amLambert-St Louis
31h 54m
2 stops
SYD9:35 amSydney Kingsford Smith
Feb 23
SYD11:20 amSydney Kingsford Smith
45h 09m
2 stops
STL3:29 pmLambert-St Louis
$1,106
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sydney 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 November 17, 2025.
Use the filters below to find and compare flights from St. Louis to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 12/1

7:00 am-9:00 am

1 stop33h 00m

Sydney Kingsford Smith

Sat 12/6

7:05 am-11:57 pm

2 stops33h 52m

$960

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 3/1

6:50 pm-8:50 pm

2 stops33h 00m

Sydney Kingsford Smith

Wed 3/18

11:20 am-11:09 pm

1 stop27h 49m

$973

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 12/8

5:30 pm-8:50 pm

2 stops34h 20m

Sydney Kingsford Smith

Wed 12/17

5:45 pm-11:57 pm

1 stop23h 12m

$980

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/9

7:04 am-9:00 am

1 stop32h 56m

Sydney Kingsford Smith

Thu 2/26

2:35 pm-11:48 pm

2 stops50h 13m

$1,002

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/16

6:30 am-9:00 am

1 stop33h 30m

Sydney Kingsford Smith

Mon 2/23

5:50 pm-11:48 pm

2 stops46h 58m

$1,018

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/28

1:20 pm-10:25 pm

2 stops40h 05m

Sydney Kingsford Smith

Sun 12/14

2:05 pm-7:27 pm

1 stop22h 22m

$1,095

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:30 pm-7:20 am

2 stops26h 50m

Sydney Kingsford Smith

Mon 5/18

9:20 am-6:25 pm

2 stops48h 05m

$1,099

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:30 pm-7:20 am

2 stops26h 50m

Sydney Kingsford Smith

Mon 5/18

9:20 am-6:25 pm

2 stops48h 05m

$1,100

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 4/18

4:05 pm-7:20 am

2 stops48h 15m

Sydney Kingsford Smith

Tue 5/12

9:20 am-6:25 pm

2 stops48h 05m

$1,101

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:30 pm-7:20 am

3 stops50h 50m

Sydney Kingsford Smith

Mon 5/18

9:20 am-6:25 pm

2 stops48h 05m

$1,102

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Sydney

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 St. Louis and Sydney?

What is the cheapest month to fly to Sydney?

In general, August is the cheapest month to fly from St. Louis to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,275. If you are unable to visit Sydney during the month of August, then departing from St. Louis during the month October is also very affordable. Most momondo users find prices during this month for around $1,331.

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from St. Louis to Sydney is on a Wednesday when prices can be found for as low as $1,392. The most expensive day to fly to Sydney is Saturday, with ticket prices averaging around $1,518.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the evening. momondo users have found flights departing from St. Louis to Sydney in the evening for as low as $1,440. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly at noon, with an average ticket price of $1,882. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You could potentially save up to 16% on your flight if you consider stops on a St. Louis to Sydney flight.

When to book flights from St. Louis to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sydney (STL to SYD) flight deals and tips

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

Direct flights

None
There are no direct flights from St. Louis to Sydney. There are no popular flight routes from St. Louis to Sydney.
Search flight deals

  • How far is Lambert-St Louis to Sydney Kingsford Smith by plane?

    Lambert-St Louis and Sydney Kingsford Smith are 9057.2 mi apart from one another. A reasonable flight in good conditions will take 20h 25m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?

    Prices for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sydney Kingsford Smith 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 Lambert-St Louis Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The travel and health documents you'll need for your trip to Sydney Kingsford Smith 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 Sydney Kingsford Smith Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sydney?

Best airlines flying from St. Louis to Sydney

Compare and see reviews for airlines that fly from St. Louis to Sydney with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $897Free CancellationRating
7.1
10,457 reviews
Search Air Canada flights
Fiji AirwaysPriceFrom $1,132Free CancellationRating
8.1
209 reviews
Search Fiji Airways flights
United AirlinesPriceFrom $1,209Free CancellationRating
7.4
9,014 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,262Free CancellationRating
7.6
938 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,340Free CancellationRating
7.2
11,046 reviews
Search American Airlines flights

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Bondi Beach
Katoomba
Wollongong
Randwick
Coogee
Cronulla
Manly
Penrith
Leura
Lithgow
Charlestown
Terrigal
Swansea

Why use momondo?

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

It is quick and easy to find St. Louis to Sydney 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 Sydney that suits you.

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

Yes. All flights to Sydney from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

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 Sydney from St. Louis.

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

If you are not ready to book a flight from St. Louis to Sydney now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Sydney and let you know when they change.

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