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Cheap flights from St. Louis to Sydney from $1,835

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sydney departing on 14/5. 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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Find the cheapest flights from St. Louis to Sydney

Cheap return flights

These are some of the best return flight deals from St. Louis to Sydney that have been recently found on momondo from popular airlines, departing in the coming months.
16:50 - 10:35STL-SYD
26h 45m2 stops
09:55 - 20:49SYD-STL
25h 54m2 stops
$1,835Air New Zealand
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Wed, 14 May - Wed, 28 May
15:30 - 08:20STL-SYD
48h 50m2 stops
09:20 - 14:49SYD-STL
44h 29m2 stops
$1,955Air Canada
Find Deal
Thu, 3 Apr - Thu, 10 Apr
13:41 - 10:35STL-SYD
29h 54m3 stops
11:50 - 23:59SYD-STL
27h 09m3 stops
$2,015
Find Deal
Wed, 14 May - Wed, 28 May
16:50 - 10:35STL-SYD
26h 45m2 stops
10:20 - 18:00SYD-STL
22h 40m1 stop
$2,106Air New Zealand
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Wed, 14 May - Wed, 28 May
06:52 - 07:05STL-SYD
33h 13m1 stop
09:10 - 23:04SYD-STL
28h 54m1 stop
$2,120American Airlines
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Wed, 14 May - Wed, 28 May
16:26 - 09:00STL-SYD
24h 34m2 stops
11:15 - 23:09SYD-STL
27h 54m1 stop
$2,344American Airlines
Find Deal
Sat, 22 Mar - Sat, 29 Mar
16:29 - 07:00STL-SYD
22h 31m1 stop
11:20 - 15:47SYD-STL
44h 27m2 stops
$2,360United Airlines
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Sun, 23 Mar - Sun, 30 Mar
06:50 - 07:45STL-SYD
32h 55m2 stops
13:15 - 09:10SYD-STL
35h 55m2 stops
$2,447Delta
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Sat, 22 Mar - Sat, 29 Mar
11:00 - 09:00STL-SYD
30h 00m2 stops
17:25 - 18:00SYD-STL
40h 35m2 stops
$2,590
Find Deal
Fri, 21 Mar - Sun, 23 Mar
16:29 - 07:00STL-SYD
22h 31m1 stop
11:20 - 16:54SYD-STL
21h 34m1 stop
$2,949United Airlines
Find Deal
Sun, 23 Mar - Sun, 30 Mar

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
14 May
STL16:50Lambert-St Louis
26h 45m
2 stops
SYD10:35Sydney Kingsford Smith
28 May
SYD09:55Sydney Kingsford Smith
25h 54m
2 stops
STL20:49Lambert-St Louis
Air New Zealand
14 May
STL16:50Lambert-St Louis
26h 45m
2 stops
SYD10:35Sydney Kingsford Smith
28 May
SYD10:20Sydney Kingsford Smith
22h 40m
1 stop
STL18:00Lambert-St Louis
Air New Zealand
21 Mar
STL07:00Lambert-St Louis
34h 15m
1 stop
SYD09:15Sydney Kingsford Smith
23 Mar
SYD19:15Sydney Kingsford Smith
60h 01m
2 stops
STL15:16Lambert-St Louis

Air Canada flights from St. Louis to Sydney

Our best Air Canada deals on St. Louis to Sydney flight tickets
Air Canada
3 Apr
STL15:30Lambert-St Louis
48h 50m
2 stops
SYD08:20Sydney Kingsford Smith
10 Apr
SYD09:20Sydney Kingsford Smith
44h 29m
2 stops
STL14:49Lambert-St Louis
Air Canada
22 Mar
STL17:33Lambert-St Louis
47h 02m
3 stops
SYD08:35Sydney Kingsford Smith
29 Mar
SYD10:25Sydney Kingsford Smith
44h 34m
2 stops
STL14:59Lambert-St Louis
Air Canada
28 June
STL13:30Lambert-St Louis
50h 50m
3 stops
SYD07:20Sydney Kingsford Smith
12 July
SYD09:20Sydney Kingsford Smith
28h 25m
2 stops
STL22:45Lambert-St Louis

See travel insights to Sydney from

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?

The month of November is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $2,181. If you aren’t able to travel to Sydney during the month of November, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $2,203.

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

Our data shows that Monday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $0. The most expensive day to fly to Sydney is Friday, with ticket prices averaging around $2,764.

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 at midday. momondo users have found flights departing from St. Louis to Sydney at midday for as low as $0. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $2,764 on average. Flights to Sydney from St. Louis in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 26 weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,437 when searching 26 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 $1,957 on momondo.

How have St. Louis to Sydney flight prices changed over time?

As of February 2025, prices for St. Louis to Sydney flights are approximately 44% cheaper when compared to flights at the same time last year.

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 return 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

Best price found

$1,835

Fastest flight time

22h 01m

Direct flights

None

Airports in Sydney

1 airport
The best flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,835
The fastest flight from St. Louis to Sydney takes 22h 01m
There are no direct flights from St. Louis to Sydney. Popular non-direct route for this connection is Lambert-St Louis Airport - Sydney Kingsford Smith Airport.
There is 1 airport near Sydney: Sydney Kingsford Smith (SYD)

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

    A flight from Lambert-St Louis to Sydney Kingsford Smith will travel around 14576.1 km. In terms of flight time, this usually takes a little over 22h 01m.

  • 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 refresh daily.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify 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 required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's licence and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.


Travelling to a place near Sydney?

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

momondo does allow users to show only those flights to Sydney from St. Louis which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Sydney.

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 simply researching potential flights to Sydney, momondo offers a useful price alert feature which will track prices for flights to Sydney from St. Louis and alert you when they change.


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