How long is the flight from St. Louis to Sydney?

A quick flight from St. Louis to Sydney can take about 29h 30m. United Airlines provides one of the quickest options available for as low as $1,762. There are 14571 km between St. Louis and Sydney.

In terms of precipitation, rainfall in Sydney ranges from 50.0 - 130.0 inches per month. March is typically the wettest month, when rainfall can reach 130.0 mm. September is typically the driest time to visit Sydney when rainfall is around 50.0 mm.

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 11.0 C).

What is the cheapest time of day to fly from STL to SYD?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Sydney as you normally would.

Can I find deals for flights from St. Louis to Sydney that include hotel bookings?

Yes. In addition to deals on St. Louis to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from St. Louis to Sydney?

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

Can I find deals for business class flights from St. Louis to Sydney?

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

$1,028+ Cheap Flights from St. Louis to Sydney

Cheap flight deals from St. Louis to Sydney

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from St. Louis to Sydney
Explore the most affordable flight options available from St. Louis to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 September 2026.

Sun 1/1119:05 -

1 stop21h 15m

Mon 9/1109:15 -

1 stop24h 35m

Deal found 27/9$1,762

Mon 9/1116:39 -

2 stops23h 41m

Mon 16/1111:20 -

2 stops23h 45m

Deal found 25/9$1,769

Sun 1/1106:21 -

2 stops33h 09m

Mon 9/1110:40 -

2 stops24h 01m

Deal found 24/9$1,770

Fri 16/1016:39 -

2 stops23h 21m

Fri 30/1010:55 -

2 stops23h 10m

Deal found 26/9$1,904

Sat 7/1119:05 -

2 stops45h 35m

Wed 11/1109:15 -

1 stop21h 58m

Deal found 26/9$1,936

Wed 4/1106:15 -

1 stop31h 45m

Sat 28/1109:10 -

1 stop30h 16m

Deal found 26/9$1,937

Tue 13/1015:12 -

2 stops24h 48m

Wed 18/1109:15 -

1 stop21h 58m

Deal found 22/9$1,941

Sat 7/1118:44 -

1 stop43h 11m

Sat 14/1106:05 -

2 stops23h 23m

Deal found 23/9$1,972

Find flight deals from St. Louis to Sydney

Round-trip from	$1,762
One-way from	$1,028
Popular in	December
Cheapest in	July
Average price	$1,953

United Airlines
9/11-16/11
2 total stops
52h 45m total
St. Louis to Sydney

Search Deals

12/10-31/12
2 total stops
26h 00m total
St. Louis to Sydney

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($410 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($68 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 12/10

07:45-07:50

2 stops32h 05m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,065

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 11/10

06:15-07:55

2 stops33h 40m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,065

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 10/10

17:36-07:55

2 stops46h 19m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,099

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 9/10

14:22-07:50

2 stops25h 28m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,150

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 8/10

12:28-07:50

2 stops51h 22m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,193

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 14/10

07:08-07:55

1 stop32h 47m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,264

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 6/10

14:38-07:50

2 stops25h 12m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,408

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 9/10

20:00-10:45

3 stops46h 45m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,536

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 7/10

14:22-07:50

2 stops25h 28m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,634

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 9/11

08:30-07:00

1 stop29h 30m

Sydney Kingsford Smith

Mon 16/11

11:50-18:05

1 stop23h 15m

$1,762

Flights are sorted by cheapest return flights first.

Deals found on 23/9

Showing 1-10 of 13 resultsSorted by cheapest first

Best time to book a flight from St. Louis to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from St. Louis with our price prediction graph.

STL-SYD

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Sydney

What is the cheapest month to book a flight from St. Louis to Sydney?

Currently, July is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,652). Flying from St. Louis to Sydney in December is currently the most expensive (average of $2,570). 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.

Related info for your journey

How long is the flight from St. Louis to Sydney?
A quick flight from St. Louis to Sydney can take about 29h 30m. United Airlines provides one of the quickest options available for as low as $1,762. There are 14571 km between St. Louis and Sydney.
Can I find deals for flights from St. Louis to Sydney that include hotel bookings?
Yes. In addition to deals on St. Louis to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from St. Louis to Sydney?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Sydney.
Can I find deals for business class flights from St. Louis to Sydney?
Yes. Cheapflights offers flight deals from St. Louis to Sydney 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 Sydney?
Currently, July is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,652). Flying from St. Louis to Sydney in December is currently the most expensive (average of $2,570). 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

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Manly

Lithgow

Cronulla

Terrigal

Katoomba

Randwick

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Bondi Beach

Coogee

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Why should you use Cheapflights to find cheap flight tickets from St. Louis to Sydney?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Sydney from St. Louis.

Can Cheapflights find flights from St. Louis to Sydney with no change fees?

Need flexible booking options for your flight to Sydney from St. Louis? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Sydney become cheaper?

Yes! Start tracking prices for St. Louis to Sydney flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from St. Louis to Sydney from $1,028

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from St. Louis to Sydney

Cheapest flights from St. Louis to SydneyExplore the most affordable flight options available from St. Louis to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 September 2026.

Explore the most affordable flight options available from St. Louis to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 September 2026.

Best flights from St. Louis to SydneyDiscover carefully curated flight deals from St. Louis to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 27 September 2026.

Discover carefully curated flight deals from St. Louis to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 27 September 2026.

Last-minute flights from St. Louis to SydneyDiscover last-minute flight deals from St. Louis to Sydney. Data last updated 27 September 2026 and is based on user searches.

Discover last-minute flight deals from St. Louis to Sydney. Data last updated 27 September 2026 and is based on user searches.

One-way flights from St. Louis to SydneySearch for one-way flight options from St. Louis to Sydney. Find affordable one-way fares based on user searches. Data last updated 27 September 2026.

Search for one-way flight options from St. Louis to Sydney. Find affordable one-way fares based on user searches. Data last updated 27 September 2026.

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Best time to book a flight from St. Louis to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from St. Louis with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from St. Louis to Sydney?

Related info for your journey

How long is the flight from St. Louis to Sydney?

Can I find deals for flights from St. Louis to Sydney that include hotel bookings?

How can I find direct flights from St. Louis to Sydney?

Can I find deals for business class flights from St. Louis to Sydney?

What is the cheapest month to book a flight from St. Louis to Sydney?

Travelling to a place near Sydney?

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Alternative routes for St. Louis to Sydney

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Complete your trip

Complete your trip to Sydney by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to New South Wales

Book a non-stop flight to one of these other cities located in New South Wales.

Search flights from St. Louis to Sydney by cabin class

Find flights from St. Louis to Sydney, based on your preferred cabin class, be it economy, premium economy, business, or first class.

St. Louis and Sydney flights

Browse other St. Louis and Sydney flight options. Last updated on 27 September 2026.

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How does Cheapflights help users find flights from St. Louis to Sydney?

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Sydney?

Can Cheapflights find flights from St. Louis to Sydney with no change fees?

Can Cheapflights notify me if prices for flights from St. Louis to Sydney become cheaper?

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Cheapest flights from St. Louis to Sydney
Explore the most affordable flight options available from St. Louis to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 September 2026.

Best flights from St. Louis to Sydney
Discover carefully curated flight deals from St. Louis to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 27 September 2026.

Last-minute flights from St. Louis to Sydney
Discover last-minute flight deals from St. Louis to Sydney. Data last updated 27 September 2026 and is based on user searches.

One-way flights from St. Louis to Sydney
Search for one-way flight options from St. Louis to Sydney. Find affordable one-way fares based on user searches. Data last updated 27 September 2026.