$590 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 1/18. 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 round-trip prices found by our users on KAYAK in the last 72 hours
Sydney
Sydney2 stops$946
Brisbane
Brisbane2 stops$976
Perth
Perth2 stops$2,115
Cairns
Cairns2 stops$1,733
Hobart
Hobart2 stops$1,274
Canberra
Canberra2 stops$1,398
Sydney
Sydney2 stops$946
Brisbane
Brisbane2 stops$976
Perth
Perth2 stops$2,115
Cairns
Cairns2 stops$1,733
Hobart
Hobart2 stops$1,274
Canberra
Canberra2 stops$1,398

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 round-trip 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 round-trip flight deals from St. Louis to Australia

Sat, Feb 7 - Sat, Feb 21
Qantas Airways Logo
7:04 am - 7:35 am
STL
-
SYD
55h 31m2 stops
Qantas Airways Logo
5:45 pm - 11:48 pm
SYD
-
STL
23h 03m1 stop
$946Qantas Airways
Thu, Feb 5 - Fri, Feb 20
Qantas Airways Logo
7:04 am - 9:30 am
STL
-
MEL
33h 26m1 stop
Qantas Airways Logo
6:45 am - 11:48 pm
MEL
-
STL
34h 03m2 stops
$953Qantas Airways
Fri, Jan 30 - Fri, Feb 6
Multiple Airlines Logo
2:45 pm - 8:45 am
STL
-
BNE
26h 00m2 stops
Multiple Airlines Logo
10:45 am - 3:29 pm
BNE
-
STL
44h 44m2 stops
$976Multiple Airlines
Thu, Jan 29 - Thu, Feb 5
Air Canada Logo
4:05 pm - 8:45 am
STL
-
BNE
48h 40m2 stops
Air Canada Logo
10:45 am - 3:29 pm
BNE
-
STL
44h 44m2 stops
$983Air Canada
Fri, Jan 30 - Fri, Feb 6
Multiple Airlines Logo
2:45 pm - 8:45 am
STL
-
BNE
26h 00m2 stops
Multiple Airlines Logo
6:10 am - 3:29 pm
BNE
-
STL
49h 19m3 stops
$993Multiple Airlines
Fri, Jan 30 - Fri, Feb 6
American Airlines Logo
3:37 pm - 6:30 am
STL
-
BNE
22h 53m1 stop
American Airlines Logo
7:40 pm - 11:59 pm
BNE
-
STL
20h 19m1 stop
$1,014American Airlines
Fri, Jan 30 - Fri, Feb 6
American Airlines Logo
3:37 pm - 6:30 am
STL
-
BNE
22h 53m1 stop
American Airlines Logo
9:40 am - 6:14 pm
BNE
-
STL
24h 34m2 stops
$1,021American Airlines
Tue, Feb 3 - Tue, Feb 10
Air Canada Logo
4:15 pm - 9:35 am
STL
-
SYD
24h 20m2 stops
Air Canada Logo
11:20 am - 3:29 pm
SYD
-
STL
45h 09m2 stops
$1,029Air Canada
Mon, Mar 9 - Mon, Mar 23
United Airlines Logo
3:23 pm - 6:30 am
STL
-
BNE
24h 07m2 stops
United Airlines Logo
10:40 am - 10:25 pm
BNE
-
STL
26h 45m1 stop
$1,039United Airlines
Mon, Feb 2 - Wed, Feb 18
United Airlines Logo
4:15 pm - 9:30 am
STL
-
MEL
24h 15m2 stops
United Airlines Logo
1:00 pm - 10:14 pm
MEL
-
STL
26h 14m3 stops
$1,149United 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 $1,275 (return) on average. On the other hand, the most expensive months are December and February, when the average cost of round-trip tickets is $1,766 and $1,511 respectively.

What’s the cheapest day of the week to fly from St. Louis to Australia?

The average price of all round-trip flights from St. Louis to Australia clicked on KAYAK for each day over the last 12 months.

When flying from St. Louis to Australia, you should consider leaving on a Wednesday and avoid Saturdays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Fridays and the most expensive ones on Saturdays.

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, which saves you about 37% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low seasonSeptember
Cheapest flight$590
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from St. Louis to Brisbane

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 travelers 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 round-trip 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 at night, when round-trip flights cost $1,440 on average. Morning departures are around 10% more expensive than evening flights, on average. The most expensive time of day to fly to Australia is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,882.

Reviews of the top 5 airlines serving 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.
8.1
Fiji AirwaysOverall score based on 210 reviews
8.2Boarding
7.5Food
8.0Comfort
7.5Entertainment
8.5Crew
Airline reviews

The airline is ok, but it needs to improve it schedules.

6.0 GoodHon, Oct 2025
NAN - SFO
Read more Fiji Airways reviews

The airline is ok, but it needs to improve it schedules.

Again, Fijian hospitality was genuine, very comfortable, only improvement would be the entertainment. Why Do they only have 5 episodes of TV shows and from like season three...

Fiji Airways was amazing, will definately be lfying them again. The "Fijian hospitality" is not a catch phrase, it is genuine. the only things that could be improved is the entertainment. Not a great choice of movies, and the TV shows only have about 5 or so episodes, and often of a random season.

They will look to squeeze every penny they can out of you!! Pick your seat$$...bring luggage$$$$... if they could charge you for the air on the plane they would!!

.very good and as I needed wheelchair assistance all staff excellent.. only suggestion is get rid of those plastic chairs hard to ride in and staff have trouble compared to others. Everything else very good experience. Will use Fiji Air again.

In-flight entertainment options could use a refresh, Consider a tie-up with Spotify for more current music and with IMDB or other service for newer selections/movie ratings.

See previous comments. Didn’t take this flight because my other flight was so delayed. Ending up on two other flights as a result and was more than a day late.

6 hour delay and they didnt try to make up any time during an over 10 hour flight

Very good; seat made ready for bed after meal, a plus since one airline covered the seat at the start.

Entertainment was not good. Seems like liquor should’ve been advertised only beer and wine was even though I saw others getting liquor didn’t realize I could. And the food to me could’ve been a little bit.

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.

Couldn't access entertainment on app as said in an email

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+.

After already paying for excess luggage prior to flight, i was advised AT check in that i had to pay $816 or forfeit my flight! The lady at the counter was SO rude and had already started offboarding me when i said i would pay it after asking her three times for the exact amount! Have lodged a formal complaint yet heard nothing. Will not ever travel via Qantas again

A few more inches of legroom is all i ask

One of the best Qantas business flights I've had. Quality product

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.

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

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

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

They charged a fee for 1st bag checked. Others in same party were free.

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.

The movies offered were great. Staff were very pleasant and very efficient.

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

Gate was overcrowded. Gate agents performed very well. Flight crew was top notch! Efficient & professional & courteous. Both meals not thermalized well. Dinner main dish was actually cold in the center. Almost inedible. Breakfast sandwich was lukewarm.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

Not comparable to Qatar Airways services on flights to Doha. Flight attendants provided basic services; I was never recognized by name or as an Executive Platinum member. Restrooms were not kept clean during the flight.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

It was just fine. I managed to make all my connection too sbut had trouble in Munich with no wheel chair and trouble trying to get help from the airport people to get to the other terminal for my flight. Finally a wonderful lady Amelia, helped me to make my flight connection Timon with zero time to spare.

Over 40 years ago my AC return flight was canceled, during this last summer the same thing happened. AC denied everything Canadian like paying for accommodations and basic necessities. So why would I ever want to fly AC again? This last flight my wife took the return flight had problems and left late, so I guess they are getting better. However I have no faith in this airline so I drove to this last destination! I'll never fly AC again!!!

Great check in process in LA and good service The check in process as well as at the gate is way better in the US versus canada 🇨🇦

Super experience. Earlier than schedule departure and arrival. Baggage handling was very good

Allow me to book extra bag check in as free though I packed in 1 luggage but that was 7 LBS overweight so make another bag to free check in.

I would like to get my money back. I flight was 4 hours late on the way to detroit, And same on my way back to Brussels they cancelled my flight and give me an other ticket and i had to wait 5 hours.

All attendents were very efficient, pleasant and happy. Everything went smoothly. The seats could have been wider. There could have been more free food instead of just one small bar.

My seat was one of those that couldn't recline, but the problem was that it was abnormally upright, so the headrest actually made the seat concave, which was uncomfortable and hard on my lower back. I had to ball my jacket up and use it as lumbar support. goodness I had it with me.

Boarding was so so after zone 3 was called all other zones went in

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

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

Information on your arrival and departure airports