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STL - SYD

Find cheap flights from St. Louis to Sydney from $998

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 9/25. 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
0 bags
Fri 5/24
Fri 5/31

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis 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.
In the last 7 days travelers have searched 44,632,927 times on KAYAK, and here is why:

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
6:20 am - 10:35 amSTL-SYD
37h 15m2 stops
11:50 am - 8:36 pmSYD-STL
23h 46m2 stops
$1,325Air New Zealand
Find Deal
Tue, Aug 13 - Wed, Sep 11
1:45 pm - 8:45 amSTL-SYD
28h 00m3 stops
11:50 am - 8:36 pmSYD-STL
23h 46m2 stops
$1,414
Find Deal
Tue, Aug 13 - Wed, Sep 11
6:02 pm - 7:05 amSTL-SYD
22h 03m1 stop
9:15 am - 11:17 pmSYD-STL
29h 02m1 stop
$1,563American Airlines
Find Deal
Thu, May 23 - Thu, May 30
6:02 pm - 7:05 amSTL-SYD
22h 03m1 stop
9:15 am - 7:30 pmSYD-STL
25h 15m2 stops
$1,566American Airlines
Find Deal
Thu, May 23 - Thu, May 30
8:05 am - 7:00 amSTL-SYD
31h 55m2 stops
10:20 am - 5:12 pmSYD-STL
21h 52m2 stops
$1,567United Airlines
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Thu, May 23 - Thu, May 30
11:00 am - 7:20 amSTL-SYD
29h 20m3 stops
9:20 am - 9:05 pmSYD-STL
26h 45m2 stops
$1,618Air Canada
Find Deal
Thu, May 23 - Thu, May 30
5:30 pm - 7:05 amSTL-SYD
22h 35m1 stop
9:10 am - 3:40 pmSYD-STL
21h 30m1 stop
$1,622Qantas Airways
Find Deal
Tue, Aug 13 - Wed, Sep 11
6:08 am - 7:00 amSTL-SYD
33h 52m2 stops
10:20 am - 5:03 pmSYD-STL
21h 43m1 stop
$1,715United Airlines
Find Deal
Tue, Aug 13 - Wed, Sep 11
5:30 pm - 7:05 amSTL-SYD
22h 35m1 stop
9:10 am - 3:40 pmSYD-STL
21h 30m1 stop
$1,716Qantas Airways
Find Deal
Thu, Aug 8 - Thu, Aug 15
12:00 pm - 7:20 amSTL-SYD
52h 20m3 stops
9:20 am - 9:05 pmSYD-STL
50h 45m3 stops
$1,917Air Canada
Find Deal
Tue, Aug 13 - Wed, Sep 11

Flights from St. Louis to Sydney - Travel Insights & Trends

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.

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

The average price of all 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 Sunday, as we generally find the cheapest rates on that day for this route. On the other hand, Wednesday is the most expensive day to fly from St. Louis to Sydney. For your return ticket, we recommend flying on a Monday 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 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 November, where tickets cost $1,410 on average. On the other hand, the most expensive months are December and January, where the average cost of tickets is $2,814 and $1,994 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for 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 month.
To get a below average price on the flight from St. Louis to Sydney, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 47 days before departure.

Which airlines provide the cheapest flights from St. Louis to Sydney?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the cheapest one-way ticket from St. Louis to Sydney found on KAYAK was with Cathay Pacific for $1,008. Air New Zealand proposed a round-trip connection from $1,325 and American Airlines from $1,563.

Good to know

Low season

April

High season

October

Cheapest flight

$998
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly and prices are also 10% lower on average.
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 $998 for a one-way ticket and $1,325 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?

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

  • What is the most popular layover when flying to Sydney from St. Louis?

    Los Angeles is the most popular layover city among KAYAK users traveling from St. Louis to Sydney.

  • Which is the best airline for flights from St. Louis to Sydney, Air New Zealand or Delta?

    The two airlines most popular with KAYAK users for flights from St. Louis to Sydney are Air New Zealand and Delta. With an average price for the route of $1,591 and an overall rating of 8.2, Air New Zealand is the most popular choice. Delta is also a great choice for the route, with an average price of $1,535 and an overall rating of 8.0.

  • 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.

See more FAQs

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.
8.2
Air New ZealandOverall score based on 658 reviews
8.8crew
8.1comfort
7.9entertainment
7.6food
8.4boarding
Airline reviews

All was good, the only thing was it didn't run on time.

8.0 ExcellentDaniel, Apr 2024ZQN - SYD
Read more about Air New Zealand reviews

All was good, the only thing was it didn't run on time.

Great meal. Best seats ever! They need to teach other airlines how to do that.

Overall excellent but the Captain kept the seat belt sign on for far too long, especially at the beginning and end of the flight. It was 2 hours after take-off before the crew were able to start the service (on an 11 hour night flight, reducing our sleeping time) and the seat belt sign on went on during breakfast (90 mins before landing) and was not turned off again until we landed. This made for an uncomfortable journey of trying to limit fluid intake because it was unclear when the toilets would be available for use.

United flight from SFO to PDX was cancelled. I will ask for a refund. Had to book on Alaska

They announced food service but then never came around. We also couldn’t land so kept trying to get to runway and then had to come up and go around happened like 3 times and cause the child next to me to start throwing up

Good food and entertainment options. Great Staff that were all welcoming and caregiving.

The recline on the seat in front of me came back so that I was staring at the top of the man’s head in front of me the whole trip. He refused to bring his seat back up twice every time he was instructed to do so and only relented when he had a tray of good in front of him. And then right back in my lap!!! Horrible man!! I complained to the staff multiple times, but no one would address the issue. Otherwise, it would have been a perfect flight.

There was a snafu with confirming seats at check which left us in limbo for the second leg of our trip. I believe the ANZ app is not well integrated with the systems at the terminal resulting in this disconcerting error.

Flight was canceled due to technical issue shortly before the check-in counters opened. Passengers were rebooked on a flight three days later. Request to be accommodated on Air Tahiti Nui could not be processed. Customer service sorted out the refund after calling and being put on hold for almost an hour.

The pilot tried to make up for lost time due to delays that were out of her control. She communicated the issues openly and clearly and made every effort to do what she could to alleviate issues.

Rescheduled after ticket purchased and issued, not 2 or 3 times and not a fourth but by 5 times, by Qantas, that's right, 5 changes! Forcing an overnight stay in Chile and need for visa. Qantas can no longer provide basic services as a national or international service provider. Professionalism is extinct and the provider needs to be mentored and educated in perfecting who to operate as an airline. Qantas is the spirit of Australian dissatisfaction.

Amazing! Was put on the earlier flight and I requested for an aisle seat and was given it. Thanks Qantas!

The crew were amazing - A great job. They made me feel special and valued.

Boarding was terrible - the ground staff member Fredeya at lax was more military than customer service, have never encountered a customer service representative as rude as her. Apart from that all other staff were wonderful and the flight was good.

The flight met my expectations. It left and landed on time

My bag didn’t make it but otherwise it was a great experience.

I travelled first class from LAX to MEL and it was a series of disasters which I put down to lax staff who dont care and a suck it attitude to customers - its all lip service and no delivery. The flight was delayed due to aircraft refuellers putting on 300,000 litres of fuel on a 380Q1. I entered via the first class bridge loaded my bags in the overhead locker. the lady in the next isle in first class also had hers in there as she wasn't allocated a locker over her seat. The attendant asked would I like a champagne - I said yes please. he promptly delivered a empty glass and the glass left on the desk. Then he ignored me for 20 minutes. When i asked him is he out of champagne he gave me the usual rubbish I was distracted. There are four staff and 15 first class passengers - give me a break. the glass stayed there on takeoff and then was still there 9 hours into the flight. When I arrived to my seat I told him I had eaten and wouldn't be eating on the flight - it was 10.30pm. Yet he comes by later 4am ( I happen to be awake) and says are you eating with us? I asked for the bed to be made up - they put a 3 inch 7cm mattress on the chair but as usual the break in the chair - the mattress sinks into it - so I had to move it around so I didnt get my back sunk in the V - Im 187cm tall. The cabinet next to 1K is for staff bags and the toilet is next door. I tried to avoid this seat but couldn't change - in to the flight 8 hours and the cabin rest change over kicks in - this attendant is shining his torch in my eyes taking out and returning his bag. Then the toilet starts flushing and forget trying to get to sleep. Yet no-one else needed torch! 11 hours into the 15.5 hour flight I ask for breakfast - I order two poached eggs, bacon on multigrain toast, tomatos and mushrooms. I get no bacon or toast and have to order it and the eggs are cold. Then I order a coffee which is so badly spilled - and not by air turbulence she brings back a serviette and replaces the first one rather than providing a clean dry saucer! First class in Qantas is a joke as the staff just don't get the meaning of prompt service and attention to detail. I will fly business class rather than first on Qantas as its better value for money but I have been very impressed with United First Polaris and given I fly internationally every month this is going to be my choice.

Experience was great. My only advice is to have a pasta dish on the menu. Otherwise everything was excellent.

Flights delayed multiple times, travellers requests for updates ignored. Qantas continues to desatisfy travelling basics.

I find the food in business class is just old and boring, it was once good but now just trying to hard to be "on Trend" with plant based for the minority of people, while those people can order a special meal anyway, while the majority have to suffer and loose a choice. only 2 choices for entree one boring plant based and 4 for main which two were seafood, one was plant based and one meat dish.

Flight delayed from Cape Town to Washington then got diverted to miami and in miami we had to fend for ourselves , im still trying to get to Shreveport now

delay several times and wait extra long to board. no entertainment service because there are problem for some rows. always encounter some delays for the last flight of the day.

I just wrote a text which was supposed to be for the flight from Denver to spokane not Frankfurt to Denver.

On time every leg of the journey and exceptional staff at counter, gate, and on board. I haven’t travelled in US for a long time and was genuinely surprised how pleasant this was.

Hated every minute of it. This flight should have only taken 1.5hrs but was delayed over 10hours. Now I am being told I cannot be compensated or refunded my ticket price or extra leg room, which I purchased but did not receive, because the airline is throwing the blame on the 3rd party I purchased tickets through and 3rd party putting the blame on airline. No one wants to help. They received their money and that's all they care about. Im going on 3 days of still trying to get to my final destination, had to cancel car rental, car insurance and hotel. Currently staying in airport until hotels open up. Thank you Lufthansa, Kayak, Underpricer and United for making this trip the worst ever.

The delays (5 hrs) were a comedy of errors, and the multiple safety issues encountered were very concerning.

flight delays, staff only communicating when pushed, food service lasting a grand total of 7 minutes, stuck in seat from 45mins into flight until landing

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

the flight from Tampa departed with a delay. The food on board was poor, usually on international airlines alcoholic beverages are offered free of charge , but here it was for a fee, the cutlery was wooden, there were no hot drinks (tea, coffee). Unfortunately, I didn't take pictures of the portions of food, but it wouldn't have been enough for a child either.And in the future, I will try not to use the services of this airline

they made me check my carryon. There was space in the overhead bins.

It was spectacular. I had basic Economy and was given so much space and their seats lean back so far. Staff was superb, food was superb, everything was superb, Finnair is Fantastic.

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

Flight boarded without pilots. Sat on plane for 3 hrs. after over an hour late boarding. Plane never took off. Had to deplane near midnight. Line for rebooking was 3 hours + long. I had to leave.

The flight was great but board was a nightmare. The gate was changed 4 times during the layover period

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

Cold air blew constantly on my legs almost making me numb.

Ac was broken so we deplaned, waited 2 hours, taxiing for takeoff they said the plane would not fly so we went back to the gate and got a new plane which took another hour. In all a 4 hour delay for an 80 min flight.

Missed the flight because of them and up geting a rental car

Delayd flight out of atl as always miss my conection in dfw no flight untill next day

Terrible experience! All flights delayed, staff had no idea of what they were doing, and at the end luggage lost for 2 days!

Cabin crew were great. Seats are criminal for tall people

Flight was delayed 1.5 hrs due to problem with a previous flight to mine; I was informed appropriately via Text & Email, however, website did not keep up with messages sent by nearly an hour. When checking-in warm & friendly reception at check-in desk until female Air Canada Rep noticed my flight number and instantly pivoted to a condescending & sarcastic comments about getting my bag checked in since I’m running so late; then tone instantly changed again few minutes later when she muttered, “Oh, they’ve delayed it” another sign systems & worse front line staff, not fully informed or simply not reading their flight status updates. Flight crew were very friendly & did a great job trying to make up lost time due to the delay.

It was great, love the experience and will definitely recommend 👌. Communication was great

My flight was great! Gate attendants and crew were great… pleasant and in good spirits. Flight delayed several hours and we were well informed of the status while on plane. Thank you!

The fact that I got to Toronto alive and well and safe is a huge plus. I thank the captain and crew for a safe flight The comfort of the aircraft leaves much to be desired. Human beings should not have to be that cramped and squashed on a flight that we pay a lot for and even have to pay for lousy food choices The cabin crew were pleasant and helpful Kudos to them as the flight was packed to capacity and there was a lot of work for them in a short space of time All in all a good experience, but too cramped

It was great to check carryon luggage at no charge when there was no room for ours. A hidden benefit of having low-tier tickets. Also great to stay off plane as long as possible. Airline gave us seats we wanted on this last leg, again at no charge.

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.

The late departure Of two hours waitresses, immature, and gossiping

Crowded plane but it flew on time and had friendly staff

Book cheap flights from St. Louis to Sydney

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Sydney found on KAYAK in the last 72 hours.
9/25Wed
2 stops
35h 40mSTL-SYD
$998
9/27Fri
2 stopsCathay Pacific
50h 20mSTL-SYD
$1,008
9/26Thu
2 stopsCathay Pacific
50h 20mSTL-SYD
$1,009
9/25Wed
1 stop
23h 40mSTL-SYD
$1,026
10/8Tue
2 stopsUnited Airlines
33h 45mSTL-SYD
$1,027
9/26Thu
1 stopQantas Airways
22h 35mSTL-SYD
$1,029
10/9Wed
2 stopsDelta
29h 35mSTL-SYD
$1,038
10/9Wed
1 stopUnited Airlines
32h 45mSTL-SYD
$1,049
9/27Fri
1 stopQantas Airways
23h 40mSTL-SYD
$1,089
9/27Fri
2 stopsAmerican Airlines
25h 27mSTL-SYD
$1,090

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Last minute flights from St. Louis to Sydney

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to Sydney that are departing in the next 10 days.
4/29Mon
multi-stopAir Canada
26h 43mSTL-SYD
5/8Wed
multi-stopAir Canada
26h 49mSYD-STL
$2,188
4/29Mon
multi-stopAir Canada
47h 20mSTL-SYD
5/8Wed
multi-stopAir Canada
50h 45mSYD-STL
$2,540
4/29Mon
multi-stopQantas Airways
21h 06mSTL-SYD
5/8Wed
multi-stopQantas Airways
29h 02mSYD-STL
$2,562
4/26Fri
multi-stopQantas Airways
21h 06mSTL-SYD
4/28Sun
multi-stopQantas Airways
28h 39mSYD-STL
$2,609
4/29Mon
multi-stopAmerican Airlines
21h 06mSTL-SYD
5/8Wed
multi-stopAmerican Airlines
25h 15mSYD-STL
$2,718
4/26Fri
multi-stopQantas Airways
21h 06mSTL-SYD
4/28Sun
multi-stopQantas Airways
44h 24mSYD-STL
$2,762
4/26Fri
multi-stopAir New Zealand
35h 26mSTL-SYD
4/28Sun
multi-stopAir New Zealand
25h 24mSYD-STL
$2,783
4/26Fri
multi-stop
24h 56mSTL-SYD
4/28Sun
multi-stop
25h 24mSYD-STL
$2,971
4/29Mon
multi-stopBritish Airways
44h 45mSTL-SYD
5/8Wed
multi-stopBritish Airways
44h 01mSYD-STL
$3,948

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St. Louis - Sydney Flights

Departure:

St. Louis (STL)United States

Destination:

Sydney (SYD)Australia

Return flight deals:

Sydney - St. Louis

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