$635 Find Cheap Flights from St. Louis to Australia - Compare and Save

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 8/18. 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.
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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$1,303
Brisbane
Brisbane2 stops$1,262
Perth
Perth3 stops$1,699
Hobart
Hobart2 stops$1,664
Canberra
Canberra2 stops$1,456
Sydney
Sydney2 stops$1,303
Brisbane
Brisbane2 stops$1,262
Perth
Perth3 stops$1,699
Hobart
Hobart2 stops$1,664
Canberra
Canberra2 stops$1,456

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

Tue, Oct 27 - Wed, Nov 11
American Airlines Logo
10:22 am - 5:00 amSTL  Lambert-St Louis-MEL Melbourne
26h 38m2 stops Charlotte Douglas Dallas/Fort Worth
American Airlines Logo
10:45 pm - 8:07 amMEL  Melbourne-STL Lambert-St Louis
26h 22m2 stops Los Angeles Los Angeles Charlotte Douglas
$1,244American Airlines
Tue, Oct 27 - Wed, Nov 11
American Airlines Logo
5:40 am - 5:00 amSTL  Lambert-St Louis-MEL Melbourne
31h 20m1 stop Dallas/Fort Worth
American Airlines Logo
10:45 pm - 8:07 amMEL  Melbourne-STL Lambert-St Louis
26h 22m2 stops Los Angeles Los Angeles Charlotte Douglas
$1,244American Airlines
Sun, Nov 1 - Sun, Nov 8
Multiple Airlines Logo
7:05 pm - 5:15 pmSTL  Lambert-St Louis-BNE Brisbane
30h 10m2 stops Dallas/Fort Worth Auckland Intl
Multiple Airlines Logo
9:40 am - 12:28 pmBNE  Brisbane-STL Lambert-St Louis
18h 48m1 stop Dallas/Fort Worth
$1,262Multiple Airlines
Wed, Sep 16 - Wed, Sep 23
Delta Logo
2:30 pm - 7:50 amSTL  Lambert-St Louis-MEL Melbourne
26h 20m2 stops Atlanta Hartsfield-Jackson Los Angeles Los Angeles
Delta Logo
10:00 am - 11:16 pmMEL  Melbourne-STL Lambert-St Louis
28h 16m2 stops Los Angeles Los Angeles Minneapolis St Paul
$1,262Delta
Sun, Nov 1 - Sun, Nov 8
Qantas Airways Logo
2:54 pm - 6:30 amSTL  Lambert-St Louis-BNE Brisbane
23h 36m1 stop Dallas/Fort Worth
Qantas Airways Logo
9:40 am - 6:15 pmBNE  Brisbane-STL Lambert-St Louis
24h 35m1 stop Dallas/Fort Worth
$1,265Qantas Airways
Tue, Oct 20 - Tue, Nov 3
United Airlines Logo
11:10 am - 9:15 amSTL  Lambert-St Louis-MEL Melbourne
30h 05m2 stops Houston George Bush Intcntl San Francisco
United Airlines Logo
12:45 pm - 6:05 pmMEL  Melbourne-STL Lambert-St Louis
22h 20m1 stop San Francisco
$1,266United Airlines
Tue, Oct 20 - Tue, Nov 3
United Airlines Logo
11:10 am - 9:15 amSTL  Lambert-St Louis-MEL Melbourne
30h 05m2 stops Houston George Bush Intcntl San Francisco
United Airlines Logo
12:45 pm - 6:05 pmMEL  Melbourne-STL Lambert-St Louis
22h 20m1 stop San Francisco
$1,267United Airlines
Sun, Jan 31 - Fri, Jun 11
Qantas Airways Logo
11:55 am - 5:00 amSTL  Lambert-St Louis-MEL Melbourne
24h 05m1 stop Dallas/Fort Worth
Qantas Airways Logo
8:00 am - 11:56 pmMEL  Melbourne-STL Lambert-St Louis
30h 56m2 stops Brisbane Los Angeles Los Angeles
$1,305Qantas Airways
Thu, Oct 15 - Wed, Oct 21
Air Canada Logo
2:40 pm - 11:30 amSTL  Lambert-St Louis-BNE Brisbane
29h 50m3 stops Toronto Pearson Intl Vancouver Intl Sydney Kingsford Smith
Air Canada Logo
5:05 am - 8:00 pmBNE  Brisbane-STL Lambert-St Louis
29h 55m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl
$1,467Air Canada
Sat, Sep 12 - Sat, Sep 19
Air Canada Logo
2:40 pm - 5:00 pmSTL  Lambert-St Louis-PER Perth
37h 20m3 stops Toronto Pearson Intl Vancouver Intl Sydney Kingsford Smith
Air Canada Logo
1:15 pm - 8:20 pmPER  Perth-STL Lambert-St Louis
44h 05m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl
$1,699Air Canada
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 May, when tickets cost $992 (return) on average. On the other hand, the most expensive months are August and December, when the average cost of round-trip tickets is $1,554 and $1,531 respectively.

Good to know

Low season

July

Cheapest flight

$635
Best time to beat the crowds with an average 5% drop in price.
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 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.

Reviews of the top 4 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.
7.5
Qantas AirwaysOverall score based on 1079 reviews
7.2Entertainment
7.7Boarding
8.1Crew
7.0Food
7.4Comfort
Airline reviews

Despite having numerous passengers held up by American Airlines delays. Qantas (an AA partner) closed boarding with 0 flexibility

2.0 MediocreAnonymous, Aug 2026
Read more Qantas Airways reviews

Despite having numerous passengers held up by American Airlines delays. Qantas (an AA partner) closed boarding with 0 flexibility

Boarding , crew and meals were all amazing. Couldn't wish for a better LOOONG flight from Dallas to Sydney .

Boarding was effortless, the food was outstanding, the seats in Premium Economy were extremely comfortable, and the staff and crew were excellent.

PREMIUM ECONOMY - excellent !Brilliant new plane. Excellent tv catalogue. Good food. Good communication and service from all friend Australian crew. Good communication from captain. Best travel experience in years.

I couldn't hear all of the announcements. It was nice when they put them on the screen.

I liked boarding the plane. The staff were rude, the food was appalling and the chairs the most uncomfortable I have ever experienced

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

Loved the staff. The economy seats could have been bigger.

The food was terrible. And the flight attendants were very rude. One flight attendant wouldn’t help a passenger lift their carry-on. Another flight attendant wouldn’t give a man an extra blanket. And they walked by not even looking at the passengers to see if they needed a glass of water.

I have flown Qantas multiple times in the past it seemed this flight the plane had less seat room or the seats were way less comfortable than before. Everything else was about the same. Thanks

The flight to America was freezing. The overnight flight back to the UK was boiling hot and the cabin stank of toilet or occasionally perfume, even though I was several rows back from either bathroom. Food was tiny portions. Two small pieces of tough and dry beef in random gravy with pretend mashed potato raking up most of it. Very little veg. Salad was ok. Wooden cutlery broke within minutes of using. Lots of old films for entertainment. Some new ones. Generally a bit rubbish.

I almost missed my connection in Chicago due to having to wait on a gate to be open I am assuming. Having to run from E terminal to C terminal and I barely made it there before they closed the door. This may not be the actual airline's fault it's crazy how there is so little time between flight especially when they are placed so far apart in the airport.

Our flight was great with an unexpected upgrade. However, four days into our travel we are still without a piece of luggage. The bag tracker has not been accurate, the airline is not communicating with me or the luggage delivery service and no one is willing to take responsibility or guarantee any kind of support or reimbursement. Unfortunately, we do not have the option to easily shop to replace items as we are currently on a cruise. I have been very disappointed by United Airlines response.

Fine not above and beyond as I had a connection that was delayed due to maintenance

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.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Overall a very poor experience - booked premium economy tickets but due to last minute flight delays , all my itinery went for a toss and had to fly economy class with no access to lounge or any compensation by united airlines to make up for the flight delays . i had expected better experience than that from united.

Onboarding - it would be great to see on the screen what group they were boarding. It was very confusing on who was boarding (even though they called it out) they were not clear and the space to board was strange.

Older plane. Food was really bad, almost not worth the effort. Huge difference with European based airlines.

My luggage was not sent with us. Not sure if this is Envoy Air responsibility but that was a very BAD experience

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

No enough space plus only allowing one laggage instead of two like other airlines.

Qatar airways ,boarding arrangements at Hamid international airport could been better

Two flight changes before the scheduled flight. On the day of the flight, the flight was delayed, which caused the connecting flight to be missed. Then, I was directed to another airport (CUN) and traveled to Tulum. American gave a $12 voucher for lunch. The least expensive item on the menu at a Mexican restaurant was $9.99. Driving to Tulum was a bad auto crash, and traffic was delayed two-plus hours. The bottom line is that we should have been at the hotel at noon, but it ended up at 11:30 PM.

Miami lounges were overcrowded and we were unable to get in. We only had a short time. But the banks are too tight in all American hubs

Overall boarding and debarking is a joke. I dont even bring luggage anymore on trips because you can never allow them to be place then in the overhead bin or you have to pay or you check them which is even worse having to wait for your luggage on the tarmac.

First time flying internationally with AA and probably my last. Not military friendly at all. Didn't allow free checked bag for military family members (dependents) on orders like other airlines. We were charged $100 for baggage weight overage (5 lbs!)even though we had military orders allowing us extra.. Didn’t allow military members to board early. Inefficient and long wait time to board. Seats are smaller and more uncomfortable than other airlines.. no drink service for over 7 hrs of flight! After initial meal was served, the crew never offered a snack or drinks until the breakfast's was served 1 1/2 hrs before landing. Overall expensive and poor experience for the entire flight.

Good but I don’t received my bags yet is been 5days still no update

My original booking was through AirCanada and unbeknownst to me they altered flights and providers which caused a complete disaster for checking in for my flights and seat assignments. The original gate agent in Auckland had me basically doing gymnastics to get onto the future flights and have my luggage follow me.

Flight cancelled. Major disruption to our travel. Do not use Air Canada from KC. To few flights.

I think overall both Air Canada and Air New Zealand did a good job the their flights. It is nice to have movies, music, podcasts etc to watch for the long flights. Just wish the seats were wider and had a foot rest to change my leg positions during the trips.

Friendlier staff who are nice to the elderly who need assistance

Service was great. Flight was delayed an hour which made our connection very tight and stressful. But we fortunately made it.

There was a mistake with the first name we only discovered at security. Air canada was unable to correct it to match then passport since it was booked through an agency. The agency could not correct it either since they need at least two hours to do that. We could not fly and lost a bunch of money. Learned my lesson about kayak.

Fresh fuit or veg snacks would be so great, but there are two good restaurants in Denver airport. Try Etais UDIS or Freshens DIA for nutritious delicious pita sandwiches/ donairs and crepes in Freshens.

I appreciate the fact that the flight took off and landed on time What I didn’t like they never offer a snack eg nuts/cookies/chips

Air Canada seems to be understaffed which caused delays at every point of the flight—delays at departure, delays in the air (circling), delay after landing, delays at the gate before disembarking. Horrible experience. And my son, who departed Toronto today, experienced delays because the passport scanning system was down and was told that he would not be able to board his flight. Toronto airport is a mess!!!!

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

Information on your arrival and departure airports