New South Wales

$712+ Cheap flights from St. Louis (STL) to New South Wales

STL — SYD
Nov 11 — Nov 181
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Cheap flight deals from St. Louis to New South Wales

Cheapest flights from St. Louis to New South Wales

Sun 10/256:04 am -
1 stop34h 56m
Mon 11/911:10 am -
1 stop26h 32m
Deal found 10/7$1,202
Sun 10/255:55 pm -
1 stop21h 05m
Mon 11/911:50 am -
2 stops26h 09m
Deal found 10/7$1,233
Fri 10/233:12 pm -
2 stops24h 48m
Sun 11/1511:50 am -
1 stop23h 15m
Deal found 10/11$1,337
Sat 11/77:05 pm -
2 stops45h 35m
Wed 11/119:15 am -
1 stop21h 58m
Deal found 10/8$1,359
Wed 11/258:47 am -
1 stop29h 08m
Wed 12/211:10 am -
1 stop26h 30m
Deal found 10/11$1,362
Fri 10/236:04 am -
1 stop34h 01m
Sun 11/1511:15 am -
1 stop26h 27m
Deal found 10/11$1,364
Tue 11/248:30 am -
1 stop29h 30m
Tue 12/111:50 am -
1 stop23h 21m
Deal found 10/10$1,367
Tue 10/136:04 am -
1 stop34h 01m
Fri 11/132:05 pm -
1 stop21h 11m
Deal found 10/11$1,401
Tue 10/134:39 pm -
2 stops47h 16m
Wed 11/1811:50 am -
2 stops22h 07m
Deal found 10/10$1,418
Tue 10/136:04 am -
1 stop34h 01m
Wed 11/182:05 pm -
1 stop26h 28m
Deal found 10/11$1,424

Find flight deals from St. Louis to New South Wales

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,202
(lastminute.com)

One-way from

$712
(oojo)

Popular in

December

Cheapest in

March

Average price

$1,656
Provider with most accurate pricing for Lambert-St Louis-Sydney Kingsford Smith flight deals.
Provider most trusted by Cheapflights users for Lambert-St Louis-Sydney Kingsford Smith flights.
From Lambert-St Louis to New South Wales
One-way flight from Lambert-St Louis to New South Wales
Highest demand for flights based on searches. 10% potential increase in price ($164 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average RT price).
Average for round-trip flights in October 2026

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from St. Louis to New South Wales that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 3/8

2:27 pm-9:00 am

2 stops25h 33m

Sydney Kingsford Smith

Wed 12/31

12:00 am-8:00 am

Nonstop0h 00m

$724

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 3/6

2:24 pm-10:20 am

3 stops26h 56m

Sydney Kingsford Smith

Sun 3/14

1:05 pm-5:13 pm

1 stop21h 08m

$1,130

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 3/8

2:24 pm-6:55 am

1 stop23h 31m

Sydney Kingsford Smith

Sat 3/20

6:05 am-1:39 pm

2 stops23h 34m

$1,139

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 10/25

4:39 pm-8:40 am

2 stops24h 01m

Sydney Kingsford Smith

Mon 11/9

9:15 am-4:59 pm

2 stops24h 44m

$1,233

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 1/29

4:57 pm-6:55 am

1 stop20h 58m

Sydney Kingsford Smith

Sat 5/15

9:10 am-7:30 pm

3 stops25h 20m

$1,238
Quickest round-trip

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 1/5

6:56 pm-1:15 pm

2 stops25h 19m

Sydney Kingsford Smith

Wed 12/31

12:00 am-8:00 am

Nonstop0h 00m

$1,265

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 11/7

7:05 pm-9:40 am

2 stops45h 35m

Sydney Kingsford Smith

Wed 11/11

9:15 am-2:13 pm

1 stop21h 58m

$1,359

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 11/25

4:39 pm-9:20 am

2 stops23h 41m

Sydney Kingsford Smith

Wed 12/2

9:15 am-2:16 pm

1 stop22h 01m

$1,367

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 4/5

7:50 pm-6:30 am

3 stops43h 40m

Sydney Kingsford Smith

Mon 4/19

12:00 pm-5:21 pm

1 stop20h 21m

$1,368

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 11/24

1:40 pm-9:05 am

2 stops26h 25m

Sydney Kingsford Smith

Tue 12/1

11:50 am-6:11 pm

1 stop23h 21m

$1,371

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/11

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Best time to book a flight from St. Louis to New South Wales

Have a flexible travel schedule? Discover the best time to fly to New South Wales from St. Louis with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from St. Louis to New South Wales

What is the cheapest month to book a flight from St. Louis to New South Wales?

Currently, March is the cheapest month in which you can book a flight from St. Louis to New South Wales (average of $1,219). Flying from St. Louis to New South Wales in December is currently the most expensive (average of $1,806). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing New South Wales

Read through reviews of airlines operating flights from St. Louis to New South Wales, such as Qantas Airways,United Airlines, andAmerican Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

7.5

Boarding

7.7

Crew

8.1

Entertainment

7.2

Comfort

7.4

Food

7.0

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.

Overall

7.5

Boarding

7.7

Crew

8.1

Entertainment

7.2

Comfort

7.4

Food

7.0

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.

Overall

7.5

Boarding

7.7

Crew

8.1

Entertainment

7.2

Comfort

7.4

Food

7.0

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.

Overall

7.5

Boarding

7.7

Crew

8.1

Entertainment

7.2

Comfort

7.4

Food

7.0

Reviews

1 / 20
4.0
Okay

Robyn,Aug 2026

LAX - SYD

I was flabbergasted when the crew completely missed me in the distribution of food and drinks in Business Class - even after they looked twice at my opened table. However - this has happened to me on my last longhaul QF flight and with the same hosty (older woman with curly bob). She obviously cannot handly the stress of initial boarding as both times she has come back to me with an apology. When compared to our usual Business/ First longhauls with Qatar or Emirates, Qantas leave ALOT to be desired. I would highly recommend going with another airline. BTW I'm a 4th gen Aussie and previous Qantas employee - I would love to love them if they provided service but they just dont.

Related info for your journey

  • What airport do you fly from for flights from St. Louis to New South Wales?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to New South Wales from St. Louis.

  • How long is the flight from St. Louis to New South Wales?

    Departing from St. Louis to New South Wales will take you 23h 31m. St. Louis and New South Wales are separated by a distance of 9054 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from St. Louis to New South Wales that include hotel bookings?

    Yes. In addition to deals on St. Louis to New South Wales flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to New South Wales?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to New South Wales.

  • Can I find deals for business class flights from St. Louis to New South Wales?

    Yes. Cheapflights offers flight deals from St. Louis to New South Wales by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to New South Wales?

    Currently, March is the cheapest month in which you can book a flight from St. Louis to New South Wales (average of $1,219). Flying from St. Louis to New South Wales in December is currently the most expensive (average of $1,806). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from St. Louis to New South Wales

AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,102Average$1,372FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,161Average$1,407FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,233Average$1,596FlexibilityNo cancel feeOn-time71%

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