$1,101 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 1/11. 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

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Best Australia Flight Deals from St. Louis

Cheapest return prices found by our users on KAYAK in the last 72 hours
Sydney
Sydney2 stops$1,653
Brisbane
Brisbane2 stops$1,818
Canberra
Canberra2 stops$4,171
Sydney
Sydney2 stops$1,653
Brisbane
Brisbane2 stops$1,818
Canberra
Canberra2 stops$4,171

Cheap Flights from St. Louis to Australia

 
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

Fri, 28 Nov - Sun, 14 Dec
Qantas Airways Logo
06:15 - 22:25STL-SYD
47h 10m2 stops
Qantas Airways Logo
14:20 - 16:07SYD-STL
18h 47m1 stop
$1,653Qantas Airways
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Sun, 14 Sep - Sat, 27 Sep
Logo
13:30 - 07:20STL-SYD
26h 50m2 stops
Logo
09:20 - 16:32SYD-STL
22h 12m2 stops
$1,795
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Sun, 14 Sep - Sat, 27 Sep
Air Canada Logo
13:39 - 07:20STL-SYD
26h 41m2 stops
Air Canada Logo
09:20 - 23:58SYD-STL
29h 38m2 stops
$1,825Air Canada
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Sat, 22 Nov - Fri, 26 Dec
Air Canada Logo
16:15 - 15:30STL-BNE
55h 15m3 stops
Air Canada Logo
10:45 - 15:26BNE-STL
44h 41m2 stops
$1,856Air Canada
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Sun, 14 Sep - Sat, 27 Sep
American Airlines Logo
16:02 - 06:55STL-SYD
23h 53m1 stop
American Airlines Logo
09:10 - 18:00SYD-STL
23h 50m2 stops
$1,933American Airlines
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Sun, 27 Jul - Sun, 3 Aug
Air New Zealand Logo
06:15 - 10:50STL-MEL
37h 35m2 stops
Air New Zealand Logo
08:35 - 22:15MEL-STL
28h 40m2 stops
$1,968Air New Zealand
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Sun, 14 Sep - Sat, 27 Sep
American Airlines Logo
16:02 - 06:55STL-SYD
23h 53m1 stop
American Airlines Logo
09:10 - 18:27SYD-STL
24h 17m2 stops
$2,002American Airlines
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Tue, 29 Jul - Tue, 12 Aug
Air New Zealand Logo
18:15 - 10:35STL-SYD
25h 20m2 stops
Air New Zealand Logo
08:45 - 16:45SYD-STL
47h 00m2 stops
$2,020Air New Zealand
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Fri, 28 Nov - Sun, 14 Dec
United Airlines Logo
10:30 - 07:00STL-SYD
27h 30m2 stops
United Airlines Logo
14:00 - 17:53SYD-STL
20h 53m1 stop
$2,095United Airlines
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Wed, 13 Aug - Mon, 18 Aug
United Airlines Logo
17:41 - 06:55STL-SYD
22h 14m1 stop
United Airlines Logo
10:20 - 16:45SYD-STL
21h 25m1 stop
$2,200United Airlines
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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 $1,957 (return) on average. On the other hand, the most expensive months are December and September, when the average cost of return tickets is $2,826 and $2,419 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 the flight from St. Louis to Australia, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

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Good to know

Low seasonAugust
High seasonDecember
Cheapest flight$1,101
Best time to beat the crowds (9% less expensive on average)
Most popular time to fly (20% more expensive on average)
Flight from St. Louis to Melbourne

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.

  • What is the cheapest time of day to fly to Australia?

    The cheapest time of day to fly to Australia is generally in the evening, when retur flights cost $1,253 on average. Morning departures are around 40% more expensive than evening flights, on average. The most expensive time of day to fly to Australia is generally in the morning, which is peak travel time and where the average cost of a ticket is $1,764.

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 8790 reviews
6.6Food
7.7Boarding
7.3Comfort
7.0Entertainment
8.1Crew
Airline reviews

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

2.0 MediocreAnonymous, June 2025LAX - SEA
Read more United Airlines reviews

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

Terrible. Out flight was delayed for 21 (twenty one) hours. United is a joke.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Very comfortable (upgraded to business class). The audio on my screen didn’t work, but I managed to play the audio through my phone while watching the screen.

The food was the worst I’ve had on any flight I’ve ever been on.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

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

Information on your arrival and departure airports

St. Louis (STL)

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