Cheap flights from St. Louis to Sydney from $712
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 3/8. 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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Fly from
Fly to
Route
Depart
Return
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
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Mon 3/8
12:08 pm-6:55 am
1 stop25h 47m
Sydney Kingsford Smith
Sat 3/20
6:05 am-1:39 pm
2 stops23h 34m
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
Tue 5/11
9:45 am-7:30 pm
3 stops24h 45m
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Mon 3/8
7:50 pm-6:25 am
3 stops41h 35m
Sydney Kingsford Smith
Sat 3/20
6:05 am-1:39 pm
2 stops23h 34m
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Fri 3/5
2:24 pm-6:55 am
1 stop23h 31m
Sydney Kingsford Smith
Sun 3/14
9:50 pm-11:56 pm
2 stops42h 06m
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Sun 10/25
6:04 am-9:00 am
1 stop34h 56m
Sydney Kingsford Smith
Mon 11/9
11:10 am-8:42 pm
1 stop26h 32m
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
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Sun 10/25
5:55 pm-7:00 am
1 stop21h 05m
Sydney Kingsford Smith
Mon 11/9
11:50 am-8:59 pm
2 stops26h 09m
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Fri 11/20
2:48 pm-6:55 am
1 stop23h 07m
Sydney Kingsford Smith
Fri 11/27
11:10 am-8:17 pm
2 stops26h 07m
St. LouisSydney
STL Lambert-St Louis - SYD Sydney Kingsford Smith
STLSYD
Lambert-St Louis
Fri 11/20
12:56 pm-6:25 am
2 stops24h 29m
Sydney Kingsford Smith
Fri 11/27
11:10 am-8:17 pm
2 stops26h 07m
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 cheapest month to fly to Sydney?
In general, July 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 $1,161. If you are unable to visit Sydney during the month of July, then departing from St. Louis during the month March is also very affordable. Most momondo users find prices during this month for around $1,219.
Can stopping save me money on St. Louis to Sydney flights?
You could potentially save up to 6% on your flight if you consider stops on a St. Louis to Sydney flight.
What is the cheapest airline that flies from Lambert-St Louis to Sydney Kingsford Smith?
Qantas Airways is the most popular carrier operating from Lambert-St Louis to Sydney Kingsford Smith
What airlines fly to Sydney?
Qantas Airways, United Airlines and American Airlines are the top three most popular airlines that fly to Sydney from St. Louis according to our data. Qantas Airways is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 3 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.
Which airport is the most popular layover for flights between St. Louis and Sydney?
Dallas (DFW) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from St. Louis to Sydney?
Flights via Dallas (DFW) offer the lowest average round-trip price of $1,198.
Which layover airport has the shortest travel time from St. Louis to Sydney?
Flights connecting via Dallas (DFW) have the shortest average one-way travel time: 21h 48m.
Which layover airport has the shortest connection time from St. Louis to Sydney?
Dallas (DFW) has the shortest average layover time for this route: 2h 54m.
When to book flights from St. Louis to Sydney
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
Frequently asked questions about flying from St. Louis to Sydney
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 22h 10m.
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?
The number of operators available for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport is 3 as of October 2026.
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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Sydney is Qantas Airways (44% of total bookings). The next most popular airlines are United Airlines (29%) and American Airlines (27%).
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 | ||
|---|---|---|---|---|---|
| PriceFrom $1,102 | Free Cancellation | Rating 7.5 1,104 reviews | |||
| PriceFrom $1,161 | Free Cancellation | Rating 7.4 10,319 reviews | |||
| PriceFrom $1,233 | Free Cancellation | Rating 7.0 12,145 reviews |
Traveling to a place near Sydney?
Book flights to Sydney if you plan to visit one of these locationsWhy 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.