STL - SYD

$656 Find Cheap Flights from St. Louis to Sydney

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 Sydney departing on 4/4. 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 Sydney

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Sydney, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Sydney, as well as popular online travel agencies
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Flight Deals

Cheap Flights from St. Louis to Sydney (STL-SYD)

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

Wed, Mar 25 - Wed, Apr 15
Air Canada Logo
8:30 am - 8:35 amSTL-SYD
32h 05m2 stops
Air Canada Logo
9:20 am - 3:24 pmSYD-STL
45h 04m2 stops
$1,060Air Canada
Find Deal
Thu, Feb 12 - Tue, Feb 17
Qantas Airways Logo
6:30 am - 9:00 amSTL-SYD
33h 30m1 stop
Qantas Airways Logo
7:05 am - 11:48 pmSYD-STL
33h 43m2 stops
$1,061Qantas Airways
Find Deal
Thu, Jan 29 - Wed, Feb 18
Qantas Airways Logo
7:04 am - 9:00 amSTL-SYD
32h 56m1 stop
Qantas Airways Logo
7:05 am - 11:48 pmSYD-STL
33h 43m2 stops
$1,081Qantas Airways
Find Deal
Wed, Mar 11 - Wed, Mar 25
Multiple Airlines Logo
3:00 pm - 8:35 amSTL-SYD
25h 35m2 stops
Multiple Airlines Logo
10:20 am - 3:29 pmSYD-STL
45h 09m2 stops
$1,120Multiple Airlines
Find Deal
Wed, Mar 25 - Wed, Apr 15
American Airlines Logo
4:43 pm - 9:00 amSTL-SYD
24h 17m2 stops
American Airlines Logo
9:10 am - 11:16 pmSYD-STL
29h 06m1 stop
$1,251American Airlines
Find Deal
Wed, Mar 11 - Wed, Mar 25
American Airlines Logo
6:30 am - 7:25 amSTL-SYD
32h 55m1 stop
American Airlines Logo
11:20 am - 11:09 pmSYD-STL
27h 49m1 stop
$1,258American Airlines
Find Deal
Sun, Mar 8 - Wed, Mar 25
United Airlines Logo
5:25 pm - 9:15 amSTL-SYD
23h 50m1 stop
United Airlines Logo
11:50 am - 10:13 pmSYD-STL
26h 23m1 stop
$1,264United Airlines
Find Deal
Wed, Mar 11 - Mon, Mar 23
United Airlines Logo
3:00 pm - 9:15 amSTL-SYD
26h 15m2 stops
United Airlines Logo
12:10 pm - 4:44 pmSYD-STL
20h 34m1 stop
$1,269United Airlines
Find Deal
Sat, Apr 11 - Sat, Apr 25
Fiji Airways Logo
6:00 pm - 11:45 amSTL-SYD
26h 45m2 stops
Fiji Airways Logo
1:15 pm - 10:29 pmSYD-STL
24h 14m2 stops
$1,305Fiji Airways
Find Deal
Wed, Mar 11 - Wed, Mar 25
Multiple Airlines Logo
3:00 pm - 8:45 amSTL-SYD
25h 45m3 stops
Multiple Airlines Logo
1:55 pm - 10:49 pmSYD-STL
24h 54m3 stops
$1,509Multiple Airlines
Find Deal

Everything you should know

Top airlines
Air Canada
Cheapest • from $1,060 (round-trip)
Fiji Airways
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 29% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 13% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$1,060
Typical prices: $1,354-$1,660
Air Canada
Wed 3/25Wed 4/15
STL - SYD • 2 stops
Cheapest one-way
$656
Typical prices: $702-$975
Fiji Airways
Sat 4/4
STL - SYD • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sydney!
Booking Insights

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

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

How much is a round-trip flight from St. Louis to Sydney?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Sydney departing in March.

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

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

If your flying dates are flexible, you should consider flying to Sydney on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from St. Louis to Sydney. For your return ticket, we recommend flying on a Friday and avoiding Saturdays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Sydney, 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 Sydney is August, where tickets cost $1,266 (return) on average. On the other hand, the most expensive months are December and January, where the average cost of round-trip tickets is $1,766 and $1,512 respectively.

How far in advance should I book a flight from St. Louis to Sydney?

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 Sydney, 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 Sydney, you should book around 2 weeks before departure, which saves you about 29% 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$656
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from St. Louis to Sydney

When to book flights from St. Louis to Sydney

Are your dates flexible? Find out the best times to travel from St. Louis to Sydney based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Sydney

  • What is the cheapest flight from St. Louis to Sydney?

    In the last 3 days, the lowest price for a flight from St. Louis to Sydney was $656 for a one-way ticket and $1,060 for a round-trip.

  • Do I need a passport to fly between St. Louis and Sydney?

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Sydney.

  • Which aircraft models fly most regularly from St. Louis to Sydney?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Sydney?

    Star Alliance, and oneworld are the airline alliances operating flights between St. Louis and Sydney, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Sydney, Fiji Airways or Qantas Airways?

    The two airlines most popular with KAYAK users for flights from St. Louis to Sydney are Fiji Airways and Qantas Airways. With an average price for the route of $1,222 and an overall rating of 8.0, Fiji Airways is the most popular choice. Qantas Airways is also a great choice for the route, with an average price of $1,515 and an overall rating of 7.5.

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

    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 Sydney.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from 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 from St. Louis to Sydney?

    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 Sydney with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and SYD can sometimes prove cheaper using this method.

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

    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 Sydney from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from St. Louis to Sydney

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Sydney. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Sydney? 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.
8.0
Fiji AirwaysOverall score based on 208 reviews
8.0Comfort
7.5Entertainment
8.1Boarding
8.5Crew
7.5Food
Airline reviews

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

6.0 GoodHon, Oct 2025NAN - 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.

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 wifi was out. Otherwise it was great flight. Richard, as CSM, was excellent.

Was bumped to a later flight because of inefficiency on part of the airline.

The Emerits/Qantas flight was cancelled to Wellington. We need a refund. Had to buy another airline ticket. How do we get the refund. Still not in Wellington.

Delayed QF59 flight once again, Qantas doesn't fail in maintaining there delayed departures and arrivals. USB points do not work nor do the power point sockets on the plane, Qantas staff admitted that on the flight. Don't expect to your charge devices. Saving grace, was the ice cream. Bottom line, if you expect to fly to HND and make it on time avoid Qantas and if you're interested in ice cream - visit 7/11.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

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.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

We loved the steward on the plane. He made the night enjoyable

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

Flight delay was communicated before leaving for airport which caused it to be a non-event. Great flight and crew!

Did not get any refreshments. Crew was very nice but limited. Small seats

Wish some foods provided rather than just biscuit/cookie for flight more than 2 hours

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

The flight attendant, a black woman with curly hair who sat near Row 21, was wonderful and kind.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

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,

Plane left an hour late, I missed my connection and my bow case was never even loaded on the plane in VA. I deal with this type of nonsense everytime I fly air canada.

For goodness sake, board from the back of the plane to the front and assign overhead space. It would fix everything. Seriously.

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

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