SYD - STL

$778 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 10/15. 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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Flights 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

Wed, Oct 15 - Tue, Oct 21
Air Canada Logo
10:20 am - 8:46 pmSYD-STL
26h 26m2 stops
Air Canada Logo
1:40 pm - 8:20 amSTL-SYD
26h 40m2 stops
$778Air Canada
Find Deal
Mon, Oct 13 - Tue, Oct 21
Air Canada Logo
10:20 am - 3:18 pmSYD-STL
44h 58m2 stops
Air Canada Logo
5:15 am - 8:20 amSTL-SYD
35h 05m2 stops
$792Air Canada
Find Deal
Mon, Aug 18 - Sat, Nov 8
American Airlines Logo
9:10 am - 7:09 pmSYD-STL
24h 59m2 stops
American Airlines Logo
3:59 pm - 9:00 amSTL-SYD
24h 01m2 stops
$814American Airlines
Find Deal
Mon, Aug 18 - Sat, Nov 8
American Airlines Logo
9:10 am - 8:18 pmSYD-STL
26h 08m2 stops
American Airlines Logo
11:39 am - 9:00 amSTL-SYD
28h 21m2 stops
$818American Airlines
Find Deal
Mon, Oct 13 - Mon, Oct 20
United Airlines Logo
10:30 am - 8:46 pmSYD-STL
26h 16m2 stops
United Airlines Logo
5:35 pm - 7:55 amSTL-SYD
22h 20m1 stop
$826United Airlines
Find Deal
Sun, Sep 14 - Sun, Sep 21
United Airlines Logo
9:30 am - 6:58 pmSYD-STL
24h 28m2 stops
United Airlines Logo
11:05 am - 6:55 amSTL-SYD
28h 50m2 stops
$830United Airlines
Find Deal
Wed, Oct 15 - Tue, Oct 21
Qantas Airways Logo
1:10 pm - 8:53 pmSYD-STL
23h 43m1 stop
Qantas Airways Logo
5:09 pm - 6:55 amSTL-SYD
21h 46m1 stop
$1,028Qantas Airways
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Mon, Oct 13 - Tue, Oct 21
Qantas Airways Logo
10:10 am - 11:05 pmSYD-STL
28h 55m1 stop
Qantas Airways Logo
6:39 am - 8:05 amSTL-SYD
33h 26m1 stop
$1,065Qantas Airways
Find Deal
Wed, Oct 15 - Tue, Oct 21
 Logo
9:55 am - 6:57 pmSYD-STL
25h 02m2 stops
 Logo
9:00 am - 8:45 amSTL-SYD
31h 45m3 stops
$1,189
Find Deal
Mon, Aug 18 - Sat, Nov 8
 Logo
12:10 pm - 7:09 pmSYD-STL
21h 59m2 stops
 Logo
3:59 pm - 12:30 pmSTL-SYD
27h 31m3 stops
$1,561
Find Deal
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 $1,065 (return) on average. On the other hand, the most expensive months are December and February, where the average cost of round-trip tickets is $1,619 and $1,565 respectively.

Good to know

Low seasonNovember
Cheapest flight$778
Best time to beat the crowds with an average 23% 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 $778 for a round-trip ticket.

  • 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 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 887 reviews
7.2Entertainment
7.7Boarding
7.4Comfort
6.9Food
8.2Crew
Airline reviews

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.

2.0 MediocreAnonymous, Jul 2025LAX - ORD
Read more Qantas Airways reviews

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.

Airline running better than post Covid, proper boarding process now implemented, some aircraft feeling a bit old and tired, crew fine, online experience better.

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.

Five hour flight instead of four hours due to westerly headwinds which wasn’t the fault of Qantas !

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.

The wifi was out. Otherwise it was great flight. Richard, as CSM, was excellent.

Traditional economy class. Not a full flight so spare seats. Food and drinks were good

Was bumped to a later flight because of inefficiency on part of the airline.

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

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