$579 Find Cheap Flights from Australia 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 to St. Louis departing on 1/14. 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

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 for flights 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 for flights to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$1,122
Typical prices: $1,281-$1,699
Air Canada
Fri 5/1Fri 5/29
SYD - STL • 2 stops
Cheapest one-way
$579
American Airlines
Wed 1/14
MEL - STL • 2 stops
When to travel
August
Cheapest • 17% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Australia to St. Louis

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

Fri, May 1 - Fri, May 29
Air Canada Logo
9:20 am - 3:16 pm
SYD
-
STL
44h 56m2 stops
Air Canada Logo
1:30 pm - 7:20 am
STL
-
SYD
50h 50m2 stops
$1,122Air Canada
Fri, May 1 - Fri, May 29
Air Canada Logo
9:20 am - 3:16 pm
SYD
-
STL
44h 56m2 stops
Air Canada Logo
9:10 am - 7:20 am
STL
-
SYD
31h 10m1 stop
$1,125Air Canada
Fri, May 1 - Fri, May 29
Air Canada Logo
9:20 am - 3:16 pm
SYD
-
STL
44h 56m2 stops
Air Canada Logo
1:30 pm - 7:20 am
STL
-
SYD
50h 50m3 stops
$1,128Air Canada
Thu, Jan 15 - Sun, Feb 15
Air Canada Logo
4:00 pm - 3:29 pm
SYD
-
STL
40h 29m2 stops
Air Canada Logo
6:00 pm - 9:35 am
STL
-
SYD
46h 35m2 stops
$1,130Air Canada
Fri, Jan 16 - Mon, Feb 16
Air Canada Logo
11:20 am - 3:29 pm
SYD
-
STL
45h 09m2 stops
Air Canada Logo
2:45 pm - 9:35 am
STL
-
SYD
25h 50m2 stops
$1,173Air Canada
Thu, Jan 15 - Mon, Feb 16
United Airlines Logo
11:20 am - 7:27 pm
SYD
-
STL
25h 07m2 stops
United Airlines Logo
5:25 pm - 9:15 am
STL
-
SYD
22h 50m1 stop
$1,183United Airlines
Sat, Jan 17 - Sat, Feb 21
Qantas Airways Logo
6:05 am - 4:14 pm
SYD
-
STL
27h 09m2 stops
Qantas Airways Logo
5:55 pm - 8:50 pm
STL
-
SYD
33h 55m2 stops
$1,196Qantas Airways
Wed, Jan 14 - Sun, Feb 15
Qantas Airways Logo
9:55 pm - 2:47 pm
SYD
-
STL
33h 52m2 stops
Qantas Airways Logo
6:50 pm - 11:35 am
STL
-
SYD
23h 45m2 stops
$1,198Qantas Airways
Sat, Jan 17 - Tue, Feb 17
American Airlines Logo
11:20 am - 4:14 pm
SYD
-
STL
21h 54m2 stops
American Airlines Logo
6:30 am - 9:00 am
STL
-
SYD
33h 30m1 stop
$1,216American Airlines
Fri, Jan 16 - Wed, Feb 18
United Airlines Logo
11:50 am - 3:52 pm
SYD
-
STL
21h 02m1 stop
United Airlines Logo
4:39 pm - 7:00 am
STL
-
SYD
21h 21m1 stop
$1,233United Airlines
Booking Insights

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights 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 to St. Louis is August, where tickets cost $931 on average for one-way flights. On the other hand, the most expensive months are July and January, where the average cost of tickets from Australia is $1,855 and $1,548 respectively. For return trips, the best month to travel is August with an average price of $1,128.

Good to know

Low seasonFebruary
Cheapest flight$579
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly with an average 9% increase in price.
Flight from Melbourne to St. Louis

FAQs - booking St. Louis flights

  • How far is Lambert-St Louis Airport from central St. Louis?

    There are 13 miles between St. Louis city center and Lambert-St Louis Airport.

  • What is the name of St. Louis’s airport?

    When flying to St. Louis, you'll arrive at Lambert-St Louis Airport (STL). The airport is also known as Lambert Field, Lambert-St Louis, St. Louis Lambert, or St. Louis Lambert Intl.

  • What is the cheapest day to fly to St. Louis?

    Based on KAYAK data, the cheapest day to fly to St. Louis is Friday where tickets can be as cheap as $1,050. On the other hand, the most expensive day to fly is Saturday, where prices are $1,861 on average.

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

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

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

  • What is the Hacker Fare option on flights 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 with another airline.

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

    The cheapest time of day to fly to St. Louis is generally in the morning, when flights cost $1,352 on average. The most expensive time of day to fly to St. Louis is generally in the evening, which is peak travel time and where the average cost of a ticket is $1,824.

  • How many direct flights to St. Louis are there each week?

    Each week there are around 2,422 direct flights from within Australia to St. Louis. The most common day for departures is Monday, with 19% of flights taking off on this day.

Top tips for finding cheap flights to St. Louis

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest St. Louis flight deals.

Reviews of the top airlines flying from Australia to St. Louis

 
See real verified KAYAK customer reviews for airlines flying to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Australia to St. Louis. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with 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 947 reviews
7.2Entertainment
7.5Comfort
7.0Food
7.7Boarding
8.1Crew
Airline reviews

Flight was canceled. I was not alerted. It was only kayak that alerted me

2.0 MediocreGerard, Nov 2025
CBR - BNE
Read more Qantas Airways reviews

Flight was canceled. I was not alerted. It was only kayak that alerted me

Flight was 2.5 hours late leaving. We spent 50 minutes of that sitting on the plane with no explanation. They did reduce the time in the air so we arrived a little less late which was something. The cheese and crackers were okay but the wine was terrible.

Excellent as always, I won't fly to Australia, and back to the US on any other airline. The flight crew is always top notch, and have a way to make one feel extra special. Thank you for your service, I would rate Qantas Airways a 10+.

Basic airline, aircraft and service. AA gets you from point A to B. My flight was delayed by 2 hours too.

No internet on flight, which makes log travels really hard.

Not great. The inflight entertainment was all on an app, and I did not want to watch a film on my phone. Also, the range of options of films was limited.

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

The food is terrible. The same pasta or chicken with bad taste and presentation

United have really come back. Airport and boarding process is clear and good, app and information also very good

The Sears in the 800s are not too good perfect Airbus why cant the new 737 fix that

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

It was probably one of the worst flights I’ve been on. The restrooms were never cleaned or stocked. The food was very subpar, and i usually enjoy airline food, so I was disappointed. It was just all around a bad experience. The only saving grace was the flight attendants.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Flight team stood out for perzonal attention, kindness at bright cheery attitudes at 8am. Very helpful.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Wentzville
Farmington
Eureka
Litchfield
Grafton
Shrewsbury
Glencoe

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

Information on the airport you'll fly into in St. Louis