STL - SYD

$647 Find Cheap Flights from St. Louis to Sydney - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Sydney departing on 10/22. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$1,293
Typical prices: $1,400-$1,577
Qantas Airways
Wed 9/23Wed 10/7
STL - SYD • 1 stop
Cheapest one-way
$717
Typical prices: $963-$1,119
Multiple Airlines
Thu 10/22
STL - SYD • 2 stops
Top airlines
Cheapest • from $1,293 (round-trip)
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Sydney. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $1,358 (round-trip)
Shortest trip • 21h 40m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 18% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Sydney (STL-SYD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Sydney that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Sydney

Wed, Sep 23 - Wed, Oct 7
Qantas Airways Logo
5:00 pm - 6:55 am
STL
-
SYD
22h 55m
1 stop
Qantas Airways Logo
1:00 pm - 6:20 pm
SYD
-
STL
21h 20m
1 stop
$1,293Qantas Airways
Mon, Oct 26 - Wed, Nov 11
Qantas Airways Logo
12:46 pm - 6:55 am
STL
-
SYD
26h 09m
1 stop
Qantas Airways Logo
2:05 pm - 6:15 pm
SYD
-
STL
21h 10m
1 stop
$1,293Qantas Airways
Wed, Sep 23 - Wed, Oct 7
Qantas Airways Logo
3:34 pm - 6:55 am
STL
-
SYD
24h 21m
1 stop
Qantas Airways Logo
6:50 pm - 11:46 pm
SYD
-
STL
20h 56m
1 stop
$1,293Qantas Airways
Mon, Sep 7 - Sun, Sep 27
United Airlines Logo
8:42 am - 6:55 am
STL
-
SYD
31h 13m
1 stop
United Airlines Logo
9:30 am - 6:43 pm
SYD
-
STL
24h 13m
2 stops
$1,307United Airlines
Tue, Nov 17 - Wed, Nov 25
United Airlines Logo
1:08 pm - 7:00 am
STL
-
SYD
24h 52m
2 stops
United Airlines Logo
11:50 am - 10:15 pm
SYD
-
STL
27h 25m
1 stop
$1,307United Airlines
Mon, Oct 26 - Wed, Nov 11
United Airlines Logo
1:08 pm - 7:00 am
STL
-
SYD
25h 52m
2 stops
United Airlines Logo
11:20 am - 6:05 pm
SYD
-
STL
23h 45m
2 stops
$1,307United Airlines
Mon, Sep 7 - Sun, Sep 27
Delta Logo
2:32 pm - 6:50 am
STL
-
SYD
25h 18m
2 stops
Delta Logo
9:15 am - 11:42 pm
SYD
-
STL
29h 27m
2 stops
$1,312Delta
Mon, Sep 7 - Mon, Sep 14
Delta Logo
10:33 am - 6:50 am
STL
-
SYD
29h 17m
2 stops
Delta Logo
9:15 am - 11:16 pm
SYD
-
STL
29h 01m
2 stops
$1,312Delta
Mon, Sep 7 - Mon, Sep 14
American Airlines Logo
10:16 am - 6:55 am
STL
-
SYD
29h 39m
1 stop
American Airlines Logo
9:10 am - 11:30 pm
SYD
-
STL
29h 20m
1 stop
$1,323American Airlines
Mon, Sep 7 - Sun, Sep 27
American Airlines Logo
12:45 pm - 6:55 am
STL
-
SYD
27h 10m
1 stop
American Airlines Logo
9:10 am - 11:30 pm
SYD
-
STL
29h 20m
1 stop
$1,323American Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to Sydney flights

Get data-powered insights and trends into flights from St. Louis to Sydney to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from St. Louis to Sydney?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Sydney departing in August.

Flight prices are below average for this route right now.

Flights to Sydney from St. Louis usually cost between $1,314 and $1,554 in August.
The lowest price found in the past 5 days was $1,237 on United Airlines (Aug 31-Sep 7).

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Sydney, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Sydney is July, where tickets cost $1,161 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,634 and $1,604 respectively.

Good to know

Low season

July

Cheapest flight

$647
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly with an average 14% increase in price.
Flight from St. Louis to Sydney

When to book flights from St. Louis to Sydney

Are your dates flexible? Find out the best times to travel from St. Louis to Sydney based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Sydney

  • What is the cheapest flight from St. Louis to Sydney?

    In the last 5 days, the lowest price for a flight from St. Louis to Sydney was $717 for a one-way ticket and $1,293 for a round-trip.

  • Do I need a passport to fly between St. Louis and Sydney?

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Sydney.

  • Which aircraft models fly most regularly from St. Louis to Sydney?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Sydney?

    Star Alliance, and oneworld are the airline alliances operating flights between St. Louis and Sydney, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Sydney, Qantas Airways or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Sydney are Qantas Airways and United Airlines. With an average price for the route of $1,384 and an overall rating of 7.5, Qantas Airways is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,381 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from St. Louis to Sydney?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Sydney.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Sydney?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Sydney?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sydney with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and SYD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Sydney?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sydney from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from St. Louis to Sydney

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Sydney. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Sydney? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.5
Qantas AirwaysOverall score based on 1073 reviews
8.1Crew
7.0Food
7.7Boarding
7.2Entertainment
7.4Comfort
Airline reviews

Boarding , crew and meals were all amazing. Couldn't wish for a better LOOONG flight from Dallas to Sydney .

10.0 ExcellentTerry, Aug 2026
DFW - SYD
Read more Qantas Airways reviews

Boarding , crew and meals were all amazing. Couldn't wish for a better LOOONG flight from Dallas to Sydney .

PREMIUM ECONOMY - excellent !Brilliant new plane. Excellent tv catalogue. Good food. Good communication and service from all friend Australian crew. Good communication from captain. Best travel experience in years.

I couldn't hear all of the announcements. It was nice when they put them on the screen.

Loved the staff. The economy seats could have been bigger.

The food was terrible. And the flight attendants were very rude. One flight attendant wouldn’t help a passenger lift their carry-on. Another flight attendant wouldn’t give a man an extra blanket. And they walked by not even looking at the passengers to see if they needed a glass of water.

Delayed and missed connection, was not re-booked like other travelers so ended up being stuck for several hours due to no one handling my booking.

same as previous comments. i hate being on a plane that long. no problems w/anything else.

Much better than I expected for such a long flight.

Good - better than other airlines in terms of food and seat comfort.

Experience was great. My only advice is to have a pasta dish on the menu. Otherwise everything was excellent.

The seats were very uncomfortable. I paid for the front economy. i swear they added a row of seats in there. It was so tight, that I could measure the distance between my seat and the one in front from my elbow to the tips of my fingers plus six inches. The seat cushion was completely worn out. The dinner was very good. Thank you for having a vegetarian option as a standard. But breakfast was nothing but sugar. that's not food. The crew was crabby and rude, especially in regards to coming to the back gallery. And the entertainment choice: why would you put violent movies on the choice? the Godfather? Some movies with black women being beaten over the head with clubs? What the heck? You know that when there is a movie on a plane, everyone gets to watch it. Why choose the most violent titles possible? The total number of movies were very limited, and the television, even more so. No games were available on the set. The wellness section was nice, thank you. I appreciated a galley in the middle where I could stand. The seats were unbearable.

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

My flight time was changed without any notification to me which ruined my time sensitive plans so I ended up completely changing my travel plans and no reimbursement.

Terrible. Our first time back on United for 10 years, the seats in Polaris class are small and uncomfortable. They have squished too many people in to get more $$$. The staff are not friendly and not wanting to accommodate. I asked for two salads rather than a main meal and was advised no we wont do that. Then asked what I would like for breakfast and given something else anyway. I will not be flying United International anytime soon.

Food should be changed in menu Many muslims travels in this airlime they need to add one Halal meal

Smooth flight. As always dinner could have been more generous. Breakfast was great.

Moody attendants that can barely look up at the passengers. I’m all for people having an off day, but you can tell some Untied Airlines Employees have lost their zeal for their jobs

Great checkin experience and flight crew were very friendly and helpful

Staff did not care, and very clearly did not want to be serving passengers. Requests were ignored repeatedly. Toilets filthy. Bins were just trash bags hung around the place that were never emptied. It was a challenge to even get a glass of water on a 14 hour flight.

Got automatically assigned a middle seat, unless I fork out extra money for seat assigment.

My luggage was not sent with us. Not sure if this is Envoy Air responsibility but that was a very BAD experience

I was traveling alone abroad for the first time and the staff was not helpful and rude at times.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

Baggage allowances are terrible and the experience of only being allowed one bag and paying so much to take sporting equipment to a known ski area should be addressed.

Bad food, small seats that didn’t recline. I thought I was buying a quantas ticket so I feel like I got scammed

Worst seats I’ve ever had !!! The seats were very narrow and uncomfortable and misaligned with the seats in front of mine leading to bottom of the seat in front of mine pressing on my legs for 15.5 hours !

Crazy seating issues. We got seated far apart. Offered middle seats at a premium rate. Why is a middle seat now the expensive seat? Baffling.

The food at Admirals Club was really great Pijamas were a nice feature The flight attendant was very nice and great attitude The aa.com does not work well specially internet service Overall a very good flight .

Flight a little late. Entertainment system didn’t work for first hour. Toilets dirty after 2 hours. Is there no one assigned to clean them?

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

Information on your arrival and departure airports