SYD - STL

$509 Find Cheap Flights from Sydney to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sydney to St. Louis departing on 3/7. 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

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
10:20 am - 3:29 pmSYD-STL
45h 09m2 stops
Air Canada Logo
4:05 pm - 8:35 amSTL-SYD
48h 30m2 stops
$809Air Canada
Find Deal
Thu, Mar 12 - Mon, Mar 16
Air Canada Logo
10:20 am - 3:29 pmSYD-STL
45h 09m2 stops
Air Canada Logo
4:05 pm - 8:35 amSTL-SYD
48h 30m2 stops
$810Air Canada
Find Deal
Wed, Dec 3 - Fri, Dec 12
American Airlines Logo
11:20 am - 10:22 pmSYD-STL
28h 02m2 stops
American Airlines Logo
6:55 am - 9:00 amSTL-SYD
33h 05m1 stop
$833American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
American Airlines Logo
11:20 am - 5:38 pmSYD-STL
22h 18m2 stops
American Airlines Logo
2:29 pm - 9:00 amSTL-SYD
25h 31m2 stops
$845American Airlines
Find Deal
Mon, Dec 1 - Tue, Dec 9
United Airlines Logo
11:50 am - 10:04 amSYD-STL
39h 14m1 stop
United Airlines Logo
4:45 pm - 7:00 amSTL-SYD
21h 15m1 stop
$850United Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
United Airlines Logo
11:50 am - 10:45 pmSYD-STL
27h 55m2 stops
United Airlines Logo
9:00 am - 9:15 amSTL-SYD
31h 15m2 stops
$851United Airlines
Find Deal
Wed, Dec 3 - Thu, Dec 11
Delta Logo
10:40 am - 11:28 pmSYD-STL
53h 48m2 stops
Delta Logo
6:00 am - 8:30 amSTL-SYD
33h 30m2 stops
$1,027Delta
Find Deal
Sun, Nov 30 - Mon, Dec 8
Qantas Airways Logo
2:05 pm - 4:32 pmSYD-STL
19h 27m1 stop
Qantas Airways Logo
1:20 pm - 6:55 amSTL-SYD
24h 35m1 stop
$1,081Qantas Airways
Find Deal
Wed, Dec 3 - Wed, Dec 10
Qantas Airways Logo
2:05 pm - 4:34 pmSYD-STL
19h 29m1 stop
Qantas Airways Logo
1:20 pm - 6:55 amSTL-SYD
24h 35m1 stop
$1,200Qantas Airways
Find Deal
Sun, Nov 30 - Wed, Dec 10
Delta Logo
10:40 am - 11:23 pmSYD-STL
53h 43m2 stops
Delta Logo
6:00 am - 8:30 amSTL-SYD
57h 30m2 stops
$1,403Delta
Find Deal

Everything you should know

Top airlines
Air Canada
Cheapest • from $809 (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 • 25% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$809
Typical prices: $1,130-1372
Air Canada
Thu 3/12Mon 3/16
SYD - STL • 2 stops
Cheapest one-way
$509
Delta
Sat 3/7
SYD - STL • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
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.

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

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 January and December, where the average cost of round-trip tickets is $1,626 and $1,619 respectively.

Good to know

Low seasonAugust
Cheapest flight$509
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly with an average 17% 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 $509 for a one-way ticket and $809 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?

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

  • 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 airline 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 907 reviews
7.7Boarding
8.2Crew
7.5Comfort
7.0Food
7.2Entertainment
Airline reviews

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.

2.0 MediocreAnonymous, Aug 2025BDL - DFW
Read more Qantas Airways reviews

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

A few more inches of legroom is all i ask

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.

One of the oldest most uncomfortable "lay down" seats I've ever experienced. Old plane and old seats that don't lay flat. The seat back does not even recline - at all. Instead the legrest awkwardly extends to fill the gap between a small cubby into which you must insert your feet/legs. I am 5' 11" and could not lay straight but had to tuck my knees. Ticket was also very expensive. Would not recommend flying business/first on Finair from Melbourne to Bangkok and will not do so again myself.

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

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