Cheap flights from St. Louis (STL) to Sydney (SYD) from $1,125

This is the cheapest one-way flight price, found on 9/19. Prices may vary by date and flight preferences.
STL — SYD
Sep 26 — Oct 31

How to find the cheapest flight from St. Louis (STL) to Sydney (SYD)

All the information you need to plan the best STL to SYD flight in 2023: compare St. Louis to Sydney flight prices with the expected peak season, weather and rainfall in Sydney.

Popular in

December

Cheapest in

October

Round-trip from

$1,356

One-way from

$1,351
High demand for flights, 23% potential price rise
Best time to find cheap flights, 14% potential price drop
From Lambert-St Louis to Sydney Kingsford Smith
One-way flight from Lambert-St Louis to Sydney Kingsford Smith

STL - SYD

Price

$1,356 - $2,782

SYD

Temperature

51.8 - 71.6 °F

SYD

Rainfall

2 - 5.1 inches

What is the cheapest day to fly round-trip from St. Louis to Sydney?

It’s generally more expensive to depart on a Saturday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

How far in advance should I book a flight from St. Louis to Sydney?

Find a great deal and save up to 37% by booking at least 39 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to Sydney within the next two weeks, with the cheapest ticket starting at $2,615.

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

Flights from St. Louis to Sydney lean towards being more expensive in December. Prices are generally better when you fly from St. Louis to Sydney in October, with the cheapest ticket starting at $1,314.

When is the cheapest time to fly from St. Louis to Sydney (STL - SYD)?

It’s optimal to fly from St. Louis to Sydney in the morning. By choosing this option you can save up to 35% on the cost of your flight, compared to a flight in the evening.

Cheap United Airlines flights from St. Louis to Sydney

Peruse some of the lowest-priced United Airlines flights we've found from St. Louis to Sydney. It's recommended that users confirm their flight details before booking.

Cheap Qantas Airways flights from St. Louis to Sydney

Browse through some of the cheapest Qantas Airways flights traveling from St. Louis to Sydney. Check back soon if you're not seeing flights that suit your needs.

Cheap St. Louis to Sydney flights in September & October 2023

The best prices found for STL to SYD flights for September, October
These are some of the best deals we've found on flights to Sydney in 2023 at this time. Check back soon for alternative fares.

St. Louis to Sydney 2023 flight deals

Cheap flights to Sydney from St. Louis found for this year
These are some of the best deals we've found on flights to Sydney in 2023 at this time. Check back soon for alternative fares.

St. Louis to Sydney flights leaving soon

Late deals on return flights to Sydney from St. Louis, departing today and this week
Book one of these great deals on flights from St. Louis to Sydney. To prevent any unwanted surprises, users should verify their flight info before booking.

One-way flights to Sydney from St. Louis

The cheapest one-way flights from St. Louis to Sydney
Users traveling one-way from St. Louis to Sydney can select one of these great deals. Users needing a return flight from St. Louis to Sydney should utilize the search form above.

Find flights from St. Louis to Sydney within your budget

Use the slider to find flights from St. Louis to Sydney that fit your budget.

Fly from

Any airport

Fly to

Any airport

Budget

$1,125 - $2,120

Route

Depart

Return

Price

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/11

2 stops29h 50m

Sydney Kingsford Smith

Sun 3/24

2 stops39h 28m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/12

2 stops53h 50m

Sydney Kingsford Smith

Wed 3/20

2 stops39h 28m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Sun 11/26

2 stops31h 50m

Sydney Kingsford Smith

Mon 12/25

1 stop27h 13m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Sun 3/3

2 stops32h 19m

Sydney Kingsford Smith

Sun 3/10

2 stops28h 12m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Wed 3/6

2 stops29h 35m

Sydney Kingsford Smith

Sun 3/31

2 stops23h 46m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Tue 11/28

1 stop20h 37m

Sydney Kingsford Smith

Sun 12/24

1 stop19h 59m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Sat 11/25

1 stop20h 31m

Sydney Kingsford Smith

Thu 12/21

1 stop19h 27m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/12

2 stops35h 10m

Sydney Kingsford Smith

Sun 2/18

2 stops42h 36m

Lambert-St LouisSydney Kingsford Smith

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/12

2 stops32h 55m

Sydney Kingsford Smith

Tue 4/2

2 stops30h 29m

Flights are sorted by cheapest first

Deals found on 9/19

Reviews of airlines servicing Sydney

Get a feel of what it's like to fly with United Airlines, Qantas Airways and Delta from St. Louis to Sydney by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Japan Airlines
8.2
Very good
401 reviews

Comfort

8.1

Boarding

8.3

Food

7.7

Overall

8.2

Crew

8.6

Entertainment

7.8

Reviews

1 / 10

the seat is so narrow. i cant move my legs

Japan Airlines
8.2
Very good
401 reviews
Japan Airlines
8.2
Very good
401 reviews

Comfort

8.1

Boarding

8.3

Food

7.7

Overall

8.2

Crew

8.6

Entertainment

7.8

Reviews

1 / 10

the seat is so narrow. i cant move my legs

Korean Air
8.2
Very good
356 reviews
Japan Airlines
8.2
Very good
401 reviews

Comfort

8.1

Boarding

8.3

Food

7.7

Overall

8.2

Crew

8.6

Entertainment

7.8

Reviews

1 / 10

the seat is so narrow. i cant move my legs

Air New Zealand
8.2
Very good
62 reviews
Japan Airlines
8.2
Very good
401 reviews

Comfort

8.1

Boarding

8.3

Food

7.7

Overall

8.2

Crew

8.6

Entertainment

7.8

Reviews

1 / 10

the seat is so narrow. i cant move my legs

Delta
7.9
Good
3,016 reviews
Japan Airlines
8.2
Very good
401 reviews

Comfort

8.1

Boarding

8.3

Food

7.7

Overall

8.2

Crew

8.6

Entertainment

7.8

Reviews

1 / 10

the seat is so narrow. i cant move my legs

United Airlines
7.4
Good
1,887 reviews
Japan Airlines
8.2
Very good
401 reviews

Comfort

8.1

Boarding

8.3

Food

7.7

Overall

8.2

Crew

8.6

Entertainment

7.8

Reviews

1 / 10

the seat is so narrow. i cant move my legs

Related info for your journey

Useful info, stats and facts about St. Louis to Sydney flights.

Can I find flights from St. Louis to Sydney for under $1,200 on Cheapflights?

Yes, there are multiple flights from St. Louis to Sydney for under $1,200. The cheapest flight booked recently is on Air Canada for just $1,125, but on average you can expect to pay $1,372.

Are there last-minute flights available from St. Louis to Sydney for under $2,600?

There are currently 4+ open flights from St. Louis to Sydney within the next 7 days for less than $2,600.

What are the cheapest airlines flying from St. Louis to Sydney round-trip?

According to our current data, Air Canada ($1,125), United Airlines ($1,360), and American Airlines ($1,362) offers the cheapest pricing from St. Louis to Sydney. Air Canada is priced at 44% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from St. Louis to Sydney one-way?

To fly one-way, consider booking your trip with Air New Zealand, which is currently one of the cheapest options available, starting at $1,351. Qantas Airways flights start at $1,752 while deals on American Airlines start at $1,756 one-way.

What are the most popular airlines that fly from St. Louis to Sydney?

What does STL to SYD mean?

These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Lambert-St Louis Airport to Sydney Kingsford Smith Airport flight would often be abbreviated as a STL to SYD flight.

Top 6 airlines flying from St. Louis to Sydney

The chart below displays the airlines Cheapflights users traveling from St. Louis to Sydney choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,008Average$1,641FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,218Average$1,792FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$1,359Average$1,771FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$1,428Average$1,694FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Qantas AirwaysCheapest$1,438Average$2,155FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air New ZealandCheapest$1,564Average$1,826FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
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