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Cheap flights from St. Louis to Sydney from $563

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 11/19. 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 St. Louis to Sydney

Cheap round-trip flights

Air New Zealand Logo
8:20 am - 10:30 amSTL-SYD
33h 10m2 stops
Air New Zealand Logo
11:45 am - 6:47 pmSYD-STL
24h 02m2 stops
$1,273Air New Zealand
Find Deal
Wed, Nov 12 - Wed, Nov 19
United Airlines Logo
4:35 pm - 7:00 amSTL-SYD
21h 25m1 stop
United Airlines Logo
11:50 am - 3:50 pmSYD-STL
21h 00m1 stop
$1,291United Airlines
Find Deal
Wed, Nov 5 - Sun, Nov 23
United Airlines Logo
5:29 pm - 9:15 amSTL-SYD
22h 46m1 stop
United Airlines Logo
11:50 am - 6:47 pmSYD-STL
23h 57m1 stop
$1,292United Airlines
Find Deal
Wed, Nov 5 - Sun, Nov 23
Delta Logo
6:50 am - 8:30 amSTL-SYD
32h 40m2 stops
Delta Logo
10:40 am - 6:35 pmSYD-STL
24h 55m2 stops
$1,296Delta
Find Deal
Wed, Nov 5 - Sun, Nov 23
Fiji Airways Logo
5:09 pm - 12:30 pmSTL-SYD
27h 21m2 stops
Fiji Airways Logo
2:00 pm - 7:30 pmSYD-STL
22h 30m2 stops
$1,304Fiji Airways
Find Deal
Sat, Nov 1 - Thu, Nov 6
Multiple Airlines Logo
6:13 pm - 1:00 pmSTL-SYD
25h 47m2 stops
Multiple Airlines Logo
2:00 pm - 7:30 pmSYD-STL
22h 30m2 stops
$1,310Multiple Airlines
Find Deal
Thu, Nov 13 - Thu, Nov 20
American Airlines Logo
2:38 pm - 9:00 amSTL-SYD
25h 22m2 stops
American Airlines Logo
11:20 am - 7:51 pmSYD-STL
25h 31m2 stops
$1,549American Airlines
Find Deal
Thu, Jan 15 - Sat, Jan 24
American Airlines Logo
2:38 pm - 9:00 amSTL-SYD
25h 22m2 stops
American Airlines Logo
5:45 pm - 11:59 pmSYD-STL
23h 14m1 stop
$1,550American Airlines
Find Deal
Thu, Jan 15 - Sat, Jan 24
Qantas Airways Logo
1:20 pm - 6:55 amSTL-SYD
24h 35m1 stop
Qantas Airways Logo
2:05 pm - 7:30 pmSYD-STL
22h 25m1 stop
$1,596Qantas Airways
Find Deal
Wed, Nov 12 - Wed, Nov 19
Qantas Airways Logo
6:39 am - 9:00 amSTL-SYD
34h 21m1 stop
Qantas Airways Logo
2:05 pm - 4:27 pmSYD-STL
19h 22m1 stop
$1,680Qantas Airways
Find Deal
Fri, Oct 31 - Sat, Nov 8

United Airlines flights from St. Louis to Sydney

Our best United Airlines deals on St. Louis to Sydney flight tickets
United Airlines
Nov 5
STL4:35 pmLambert-St Louis
21h 25m
1 stop
SYD7:00 amSydney Kingsford Smith
Nov 23
SYD11:50 amSydney Kingsford Smith
21h 00m
1 stop
STL3:50 pmLambert-St Louis
$1,291
Find similar
United Airlines
Nov 5
STL5:29 pmLambert-St Louis
22h 46m
1 stop
SYD9:15 amSydney Kingsford Smith
Nov 23
SYD11:50 amSydney Kingsford Smith
23h 57m
1 stop
STL6:47 pmLambert-St Louis
$1,292
Find similar
United Airlines
Nov 28
STL4:35 pmLambert-St Louis
21h 25m
1 stop
SYD7:00 amSydney Kingsford Smith
Dec 14
SYD2:00 pmSydney Kingsford Smith
19h 27m
1 stop
STL4:27 pmLambert-St Louis
$1,427
Find similar

Air New Zealand flights from St. Louis to Sydney

Our best Air New Zealand deals on St. Louis to Sydney flight tickets
Air New Zealand
Nov 12
STL8:20 amLambert-St Louis
33h 10m
2 stops
SYD10:30 amSydney Kingsford Smith
Nov 19
SYD11:45 amSydney Kingsford Smith
24h 02m
2 stops
STL6:47 pmLambert-St Louis
$1,273
Find similar
Air New Zealand
Nov 28
STL6:15 amLambert-St Louis
33h 30m
2 stops
SYD8:45 amSydney Kingsford Smith
Dec 14
SYD11:45 amSydney Kingsford Smith
27h 13m
2 stops
STL9:58 pmLambert-St Louis
$1,320
Find similar
Air New Zealand
Nov 14
STL8:20 amLambert-St Louis
31h 25m
2 stops
SYD8:45 amSydney Kingsford Smith
Nov 21
SYD11:45 amSydney Kingsford Smith
24h 02m
2 stops
STL6:47 pmLambert-St Louis
$1,367
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 September 30, 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

Wed 11/12

8:20 am-10:30 am

2 stops33h 10m

Sydney Kingsford Smith

Wed 11/19

11:45 am-6:47 pm

2 stops24h 02m

$1,273

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

4:35 pm-7:00 am

1 stop21h 25m

Sydney Kingsford Smith

Sun 11/23

11:50 am-3:50 pm

1 stop21h 00m

$1,291

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

5:29 pm-9:15 am

1 stop22h 46m

Sydney Kingsford Smith

Sun 11/23

11:50 am-6:47 pm

1 stop23h 57m

$1,292

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

6:50 am-8:30 am

2 stops32h 40m

Sydney Kingsford Smith

Sun 11/23

10:40 am-6:35 pm

2 stops24h 55m

$1,296

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 11/1

5:09 pm-12:30 pm

2 stops27h 21m

Sydney Kingsford Smith

Thu 11/6

2:00 pm-7:30 pm

2 stops22h 30m

$1,304

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 11/13

6:13 pm-1:00 pm

2 stops25h 47m

Sydney Kingsford Smith

Thu 11/20

2:00 pm-7:30 pm

2 stops22h 30m

$1,310

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 1/15

2:38 pm-9:00 am

2 stops25h 22m

Sydney Kingsford Smith

Sat 1/24

11:20 am-7:51 pm

2 stops25h 31m

$1,549

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 1/15

2:38 pm-9:00 am

2 stops25h 22m

Sydney Kingsford Smith

Sat 1/24

5:45 pm-11:59 pm

1 stop23h 14m

$1,550

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/12

1:20 pm-6:55 am

1 stop24h 35m

Sydney Kingsford Smith

Wed 11/19

2:05 pm-7:30 pm

1 stop22h 25m

$1,596

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 10/31

6:39 am-9:00 am

1 stop34h 21m

Sydney Kingsford Smith

Sat 11/8

2:05 pm-4:27 pm

1 stop19h 22m

$1,680

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 $1,266. 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 $1,360.

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.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,467 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from St. Louis for as low as $909 on momondo.

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

You could potentially save up to 10% 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.
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  • 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 21h 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
10,000 reviews
Search Air Canada flights
Fiji AirwaysPriceFrom $1,132Free CancellationRating
8.0
205 reviews
Search Fiji Airways flights
United AirlinesPriceFrom $1,209Free CancellationRating
7.4
8,931 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $1,262Free CancellationRating
7.6
910 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $1,340Free CancellationRating
7.2
10,000 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
Cronulla
Coogee
Lithgow
Penrith
Manly
Leura
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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