$821 Find Cheap Flights from St. Louis to Australia

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 Australia departing on 1/3. 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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Cheap Flights from St. Louis to Australia

Cheapest return prices found by our users on KAYAK in the last 72 hours
Sydney
Sydney2 stops$1,394
Brisbane
Brisbane2 stops$1,365
Sydney
Sydney2 stops$1,394
Brisbane
Brisbane2 stops$1,365

Book Cheap St. Louis to Australia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from St. Louis to Australia 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 return flight deals from St. Louis to Australia

Sun, 24 May - Sun, 7 Jun
Air Canada Logo
13:00 - 07:05
STL
-
BNE
51h 05m
2 stops
Air Canada Logo
10:00 - 20:05
BNE
-
STL
25h 05m
2 stops
$1,365Air Canada
Tue, 10 Mar - Wed, 18 Mar
Qantas Airways Logo
18:08 - 17:10
STL
-
BNE
32h 02m
2 stops
Qantas Airways Logo
19:40 - 23:58
BNE
-
STL
19h 18m
1 stop
$1,372Qantas Airways
Sun, 29 Mar - Wed, 8 Apr
Delta Logo
18:59 - 08:50
STL
-
MEL
45h 51m
2 stops
Delta Logo
10:00 - 17:07
MEL
-
STL
22h 07m
2 stops
$1,675Delta
Fri, 3 Apr - Sun, 19 Apr
Delta Logo
07:15 - 08:50
STL
-
MEL
33h 35m
2 stops
Delta Logo
10:00 - 00:25
MEL
-
STL
29h 25m
2 stops
$1,746Delta
Thu, 12 Mar - Sat, 21 Mar
American Airlines Logo
14:31 - 09:30
STL
-
MEL
26h 59m
2 stops
American Airlines Logo
16:05 - 20:32
MEL
-
STL
20h 27m
1 stop
$1,815American Airlines
Sun, 15 Mar - Sun, 22 Mar
Multiple Airlines Logo
06:38 - 13:35
STL
-
HBA
38h 57m
2 stops
Multiple Airlines Logo
19:35 - 17:13
HBA
-
STL
37h 38m
2 stops
$2,126Multiple Airlines
Mon, 11 May - Sat, 16 May
Cathay Pacific Logo
06:20 - 22:40
STL
-
PER
51h 20m
2 stops
Cathay Pacific Logo
00:10 - 23:59
PER
-
STL
36h 49m
2 stops
$2,167Cathay Pacific
Thu, 5 Mar - Mon, 9 Mar
Cathay Pacific Logo
18:50 - 22:55
STL
-
PER
38h 05m
2 stops
Cathay Pacific Logo
08:30 - 17:58
PER
-
STL
46h 28m
2 stops
$2,527Cathay Pacific
Mon, 11 May - Sun, 17 May
Multiple Airlines Logo
07:30 - 15:45
STL
-
PER
43h 15m
3 stops
Multiple Airlines Logo
23:55 - 12:06
PER
-
STL
49h 11m
3 stops
$2,620Multiple Airlines
Sat, 14 Feb - Fri, 27 Feb
American Airlines Logo
08:00 - 12:25
STL
-
PER
38h 25m
3 stops
American Airlines Logo
22:40 - 17:13
PER
-
STL
32h 33m
2 stops
$25,887American Airlines
Booking Insights

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Australia, 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 Australia is August, when tickets cost $1,720 (return) on average. On the other hand, the most expensive months are December and February, when the average cost of return tickets is $2,326 and $2,157 respectively.

How far in advance should I book a flight from St. Louis to Australia?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Australia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below-average price on a flight from St. Louis to Australia, you should book around 2 weeks before departure, which saves you about 34% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Find deals

Good to know

Low seasonMarch
Cheapest flight$821
Best time to beat the crowds (3% less expensive on average)
Most popular time to fly and prices are also 5% lower on average.
Flight from St. Louis to Sydney

FAQs - booking Australia flights

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

    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 Australia.

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

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

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from St. Louis to Australia with an airline and back with another airline.

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

    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 from St. Louis to Australia 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 St. Louis to Australia

 
Need help choosing which airline to fly with from St. Louis to Australia? 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.
7.4
United AirlinesOverall score based on 9215 reviews
7.3Comfort
8.1Crew
6.6Food
7.7Boarding
7.1Entertainment
Airline reviews

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

8.0 ExcellentAnonymous, Jan 2026
ORD - TPA
Read more United Airlines reviews

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

The food was terrible this time. Otherwise pleasant, quiet, on-time.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

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

Information on your arrival and departure airports

St. Louis (STL)