SYD - STL

$877 Find Cheap Flights from Sydney to St. Louis

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sydney to St. Louis departing on 3/12. 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

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sydney to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sydney to St. Louis, as well as popular online travel agencies
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Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Sydney to St. Louis 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 Sydney to St. Louis

Thu, Mar 12 - Mon, Mar 16
Air Canada Logo
10:25 am - 3:29 pmSYD-STL
45h 04m2 stops
Air Canada Logo
4:05 pm - 8:35 amSTL-SYD
48h 30m2 stops
$877Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
Air Canada Logo
10:25 am - 3:29 pmSYD-STL
45h 04m2 stops
Air Canada Logo
4:05 pm - 8:35 amSTL-SYD
48h 30m2 stops
$880Air Canada
Find Deal
Sat, Jan 10 - Sun, Jun 7
Delta Logo
10:40 am - 11:25 pmSYD-STL
29h 45m2 stops
Delta Logo
7:30 am - 6:35 amSTL-SYD
32h 05m2 stops
$1,407Delta
Find Deal
Thu, Mar 12 - Mon, Mar 16
American Airlines Logo
11:20 am - 8:48 amSYD-STL
37h 28m2 stops
American Airlines Logo
5:59 pm - 6:55 amSTL-SYD
20h 56m1 stop
$1,526American Airlines
Find Deal
Thu, Mar 12 - Mon, Mar 16
American Airlines Logo
11:20 am - 8:48 amSYD-STL
37h 28m2 stops
American Airlines Logo
5:59 pm - 6:55 amSTL-SYD
20h 56m1 stop
$1,530American Airlines
Find Deal
Sat, Jan 10 - Sun, Jun 7
Alaska Airlines Logo
9:40 pm - 1:54 pmSYD-STL
33h 14m2 stops
Alaska Airlines Logo
6:20 pm - 7:45 pmSTL-SYD
34h 25m2 stops
$1,535Alaska Airlines
Find Deal
Thu, Mar 12 - Mon, Mar 16
Air Canada Logo
10:25 am - 3:29 pmSYD-STL
45h 04m2 stops
Air Canada Logo
8:00 am - 8:35 amSTL-SYD
32h 35m3 stops
$1,609Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
American Airlines Logo
11:20 am - 11:09 pmSYD-STL
27h 49m1 stop
American Airlines Logo
5:59 pm - 6:55 amSTL-SYD
20h 56m1 stop
$1,641American Airlines
Find Deal
Sat, Jan 10 - Sun, Jun 7
United Airlines Logo
11:50 am - 9:22 amSYD-STL
38h 32m1 stop
United Airlines Logo
3:15 pm - 7:00 amSTL-SYD
24h 45m2 stops
$1,727United Airlines
Find Deal
Sat, Jan 10 - Sun, Jun 7
United Airlines Logo
2:00 pm - 5:11 amSYD-STL
32h 11m1 stop
United Airlines Logo
11:00 am - 6:55 amSTL-SYD
28h 55m2 stops
$1,732United Airlines
Find Deal

Everything you should know

Top airlines
Air Canada
Cheapest • from $877 (round-trip)
Qantas Airways
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
November
Cheapest • 23% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$877
Overall average: $1,196
Air Canada
Thu 3/12Mon 3/16
SYD - STL • 2 stops
Cheapest one-way
$1,082
Typical prices: $1,115-$3,131
Air New Zealand
Tue 12/16
SYD - STL • 1 stop
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We hope you love your trip to St. Louis!
Booking Insights

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

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

What’s the cheapest day of the week to fly from Sydney to St. Louis?

The average price of all round-trip flights from Sydney to St. Louis clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to St. Louis on a Friday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Sydney to St. Louis. For your return ticket, we recommend flying on a Wednesday and avoiding Saturdays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Sydney to St. Louis, 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 Sydney to St. Louis is November, where tickets cost $1,031 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is $1,619 and $1,600 respectively.

Good to know

Low seasonAugust
Cheapest flight$877
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from Sydney to St. Louis

When to book flights from Sydney to St. Louis

Are your dates flexible? Find out the best times to travel from Sydney to St. Louis 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 Sydney to St. Louis

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

    In the last 3 days, the lowest price for a flight from Sydney to St. Louis was $1,082 for a one-way ticket and $877 for a round-trip.

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

    Yes

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Sydney to St. Louis are Qantas Airways and United Airlines. With an average price for the route of $1,789 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 $1,401 and an overall rating of 7.4.

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

    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 Sydney to St. Louis.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Sydney 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 Sydney to St. Louis?

    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 St. Louis with an airline and back to Sydney with another airline. Booking your flights between Sydney and STL 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 Sydney to St. Louis?

    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 St. Louis from Sydney up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Sydney to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Sydney to St. Louis. 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 Sydney to St. Louis? 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 926 reviews
7.5Comfort
7.2Entertainment
7.7Boarding
7.0Food
8.2Crew
Airline reviews

Basic airline, aircraft and service. AA gets you from point A to B. My flight was delayed by 2 hours too.

6.0 GoodSandipan, Oct 2025SYD - DFW
Read more Qantas Airways reviews

Basic airline, aircraft and service. AA gets you from point A to B. My flight was delayed by 2 hours too.

No internet on flight, which makes log travels really hard.

My flight from Dallas to Sydney was cancelled. My entire trip was rerouted to include the following: Hartford to Washington DC Washington DC to JFK JFK to Auckland Auckland to Christchurch I paid for an aisle seat on the flight to Auckland and was asked if I would take a window seat to accommodate a family. The agent at the podium failed to mention that the family had a 3 month old baby and that a bassinet would be used during the 16 hour flight. The only way I could get out of my seat was to crawl under the bassinet of the sleeping baby. I think it is wrong that I was no given the choice to sit in another seat, that the agent knew what she was doing and chose to not properly disclose my seating arrangement. Terrible treatment.

they ran out of fruit for breakfast and so I just had a yogurt instead. other than that the flight was good

by the time they got to our row, they were out of some of the food options. games and movies were great but maybe more game options like tetris or pac man would be great

Great as usual, some delays but well communicated and made up for in the air

Poor! This flight was delayed 14 hours. There was no assistance in helping customers find other routes to their destination, nor any other kind of support. It was a chaotic experience. I'm not likely to fly with AA going forward.

Business class points redemption - good value for points paid, dubious value if out of your own pocket, domestic class business product okay for this length of flight. The flight left and arrived on time, crew were good, aircraft was a bit old and tired, but still miles ahead of their competitors in Virgin and Jetstar.

We were upgraded and after just a short delay in attending to a safety check we were on our way. Would definately fly Qantas International on their Dreamliner again.

I tried to check in online but was unable to do so. I stood in line for nearly two hours to check in. American Airlines was understaffed. When I finally got to the kiosk to check in, I was still unable to check in. No AA staff was available to help. Finally one of the airport security agents who was helping passengers became of lack of AA Staff told me: “I think the reason you can’t check in is that you are starting your name with an upper case letter when you write it. Just write it with all lower case letters.” That did allow me to check in. HOW COULD ANYONE POSSIBLY KNOW THAT IF THEY USE AN INITIAL UPPER CASE LETTER TO SPELL THEIR OWN NAME, AA WOULD NOT ALLOW THEM TO CHECK IN?????? Then I had to wait in line over half an hour again to drop off my baggage. Although I arrived at the airport 3 hours early, by the time I got to the gate, they had already started boarding.

Short flight but an "eager to help" crew made the journey more enjoyable!

Not enough veg food available for passengers. I actually did not get the veg food and was told it was over, and I starved the entire flight duration.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Flight left on time. Boarding was easy. Arrived to EWR 30 mins early. Luggage was deplaned in good time. Overall a very good experience.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

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

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