$1,055 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 18/8. 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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Cheap Flights from St. Louis to Australia

Cheapest return prices found by our users on KAYAK in the last 72 hours
Sydney
Sydney2 stops$1,395
Brisbane
Brisbane2 stops$1,794
Canberra
Canberra2 stops$2,300
Sydney
Sydney2 stops$1,395
Brisbane
Brisbane2 stops$1,794
Canberra
Canberra2 stops$2,300

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

Mon, 1 Dec - Sun, 1 Feb
Air Canada Logo
16:05 - 06:55STL-SYD
45h 50m2 stops
Air Canada Logo
11:20 - 15:29SYD-STL
45h 09m2 stops
$1,395Air Canada
Find Deal
Sun, 31 Aug - Thu, 18 Sep
Air Canada Logo
09:15 - 07:20STL-SYD
31h 05m2 stops
Air Canada Logo
09:20 - 19:57SYD-STL
49h 37m2 stops
$1,482Air Canada
Find Deal
Wed, 29 Oct - Sat, 15 Nov
 Logo
13:35 - 08:35STL-SYD
27h 00m2 stops
 Logo
11:20 - 15:29SYD-STL
45h 09m2 stops
$1,504
Find Deal
Sun, 21 Sep - Sun, 5 Oct
United Airlines Logo
15:20 - 06:55STL-SYD
24h 35m2 stops
United Airlines Logo
11:20 - 20:46SYD-STL
25h 26m2 stops
$1,681United Airlines
Find Deal
Mon, 1 Dec - Sun, 1 Feb
Qantas Airways Logo
13:20 - 06:55STL-SYD
24h 35m1 stop
Qantas Airways Logo
07:20 - 11:44SYD-STL
21h 24m2 stops
$1,682Qantas Airways
Find Deal
Sun, 21 Sep - Sun, 5 Oct
United Airlines Logo
15:20 - 06:55STL-SYD
24h 35m2 stops
United Airlines Logo
11:20 - 17:09SYD-STL
21h 49m1 stop
$1,685United Airlines
Find Deal
Sun, 14 Sep - Sun, 21 Sep
 Logo
06:20 - 07:30STL-SYD
34h 10m1 stop
 Logo
09:20 - 19:57SYD-STL
49h 37m2 stops
$1,724
Find Deal
Fri, 28 Nov - Sun, 14 Dec
Qantas Airways Logo
06:15 - 10:55STL-SYD
35h 40m2 stops
Qantas Airways Logo
14:20 - 18:15SYD-STL
20h 55m1 stop
$1,730Qantas Airways
Find Deal
Thu, 11 Sep - Thu, 18 Sep
American Airlines Logo
08:50 - 06:55STL-SYD
31h 05m1 stop
American Airlines Logo
17:45 - 22:59SYD-STL
20h 14m1 stop
$1,810American Airlines
Find Deal
Sun, 14 Sep - Sat, 27 Sep
American Airlines Logo
15:56 - 07:05STL-SYD
24h 09m2 stops
American Airlines Logo
09:10 - 20:15SYD-STL
26h 05m2 stops
$1,813American Airlines
Find Deal
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 $1,926 (return) on average. On the other hand, the most expensive months are December and September, when the average cost of return tickets is $2,857 and $2,353 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 23% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.


Good to know

Low seasonJuly
Cheapest flight$1,055
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly (7% 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.

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 8900 reviews
7.3Comfort
7.7Boarding
8.1Crew
7.1Entertainment
6.6Food
Airline reviews

Terrible. Delayed 7 hours, and cancelled the flight, leaving me stranded and out of pocket $500 for an alternative last minute flight

2.0 MediocreV, July 2025MIA - EWR
Read more United Airlines reviews

Terrible. Delayed 7 hours, and cancelled the flight, leaving me stranded and out of pocket $500 for an alternative last minute flight

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

the delay for 3 hours was understandable due to weather conditions but the flight should’ve provided some on flight compensations or at least provide more food.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

The best airline I have ever travel , really good customer service, attention and service !!

United could have one single once of customer service. No human United employee would help me with the invalid mileage plus number, they said I had to speak with the computer.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

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

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