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STL - SYD

$1,145 Find cheap flights from St. Louis to Sydney

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Sydney departing on 6/9. 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
Wed 6/12
Wed 6/19

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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 41,771,603 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
11:00 am - 7:20 amSTL-SYD
29h 20m2 stops
9:20 am - 9:05 pmSYD-STL
50h 45m2 stops
$1,145Air Canada
Find Deal
Sun, Jun 9 - Mon, Jul 29
12:00 pm - 7:20 amSTL-SYD
28h 20m2 stops
9:20 am - 8:01 pmSYD-STL
25h 41m2 stops
$1,148Air Canada
Find Deal
Mon, Aug 5 - Sun, Aug 25
9:08 am - 7:00 amSTL-SYD
30h 52m2 stops
10:20 am - 5:03 pmSYD-STL
21h 43m1 stop
$1,389United Airlines
Find Deal
Mon, Aug 5 - Sun, Aug 25
6:29 am - 7:05 amSTL-SYD
33h 36m1 stop
9:15 am - 10:58 pmSYD-STL
28h 43m1 stop
$1,412Qantas Airways
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Sun, Jun 9 - Sun, Jun 16
6:00 pm - 7:00 amSTL-SYD
22h 00m1 stop
10:20 am - 12:30 amSYD-STL
29h 10m1 stop
$1,435United Airlines
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Sun, Sep 22 - Fri, Oct 4
9:23 am - 7:05 amSTL-SYD
30h 42m2 stops
9:15 am - 10:58 pmSYD-STL
28h 43m1 stop
$1,488American Airlines
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Sun, Jun 9 - Sun, Jun 16
6:29 am - 8:10 amSTL-SYD
34h 41m1 stop
5:35 pm - 11:07 pmSYD-STL
20h 32m1 stop
$1,519Qantas Airways
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Fri, Jun 21 - Sat, Jul 13
5:30 pm - 8:10 amSTL-SYD
23h 40m1 stop
9:10 am - 3:40 pmSYD-STL
21h 30m1 stop
$1,534
Find Deal
Mon, Sep 23 - Sat, Oct 5
7:00 am - 7:05 amSTL-SYD
33h 05m1 stop
9:15 am - 10:42 pmSYD-STL
28h 27m1 stop
$1,597American Airlines
Find Deal
Sat, Aug 17 - Fri, Aug 30
8:05 am - 8:45 amSTL-SYD
33h 40m3 stops
10:50 am - 10:15 pmSYD-STL
26h 25m3 stops
$1,837
Find Deal
Sun, Sep 22 - Fri, Oct 4

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 February, where tickets cost $1,309 on average. On the other hand, the most expensive months are December and July, where the average cost of tickets is $2,610 and $2,144 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 1 week before departure. For the absolute cheapest price, our data suggests you should book 60 days before departure.

Good to know

Low season

July

High season

March

Cheapest flight

$1,145
Best time to beat the crowds but there is an average 27% increase in price.
Most popular time to fly and prices are also 20% 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 $1,145 for a round-trip ticket.

  • 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 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, Qantas Airways or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Sydney are Qantas Airways and United Airlines. With an average price for the route of $1,781 and an overall rating of 7.6, Qantas Airways is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,364 and an overall rating of 7.4.

  • 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 630 reviews
8.1Comfort
8.4Boarding
7.6Food
7.9Entertainment
8.8Crew
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.

The international flight from Sydney to Dallas had great food. I have travelled a lot over the years and this has been the most memorable in my experience so far.

flight delayed, wait in crowded gate. staff inattentive. had to remind them to get my coat from their closet. not many new movies, media choices were limited (nothing compared to Emirates.) Lounge was crowded

flight delayed, wait in crowded gate. staff inattentive. had to remind them to get my coat from their closet. not many new movies, media choices were limited (nothing compared to Emirates.)

Initial flight was cancelled so moved to an alternative flight. As a result, stuck in a middle seat. Flight then place in holding pattern prior to landing resulting in a very late trip home.

There was nothing I didn’t like, prices a little lower would help

Flight delay was informed at the last minute. Food quality is not up to Qantas standard I was unable to book an online boarding pass on any of my 6 flights.

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.

Energetic crew - flight full of swiftied going to Taylor's opening show in Paris! Long lines for bathroom made out kind of suck though

Check in etc was very good. As for on the plane, it was like flying in a freezer. It was so cold, i have flown for years and never been so cold on a plane. Staff on board said its always cold when flying which is a load of rubbish. They wouldnt put any heating on and now i have the flu because of this .

I’ve had a couple flights this week on United that were delayed by an hour or more

Flight was delayed 2.5 hours - a big deal on an overnight when you plan to sleep.

I feel like they have upgraded the app since I last flew United and I found it to be super helpful. I had stopped flying United unless absolutely necessary and my experience on this trip indicates they have been working hard to improve their services.

Surprisingly easy! I was hesitant to try this, but the cost swayed me. I actually felt like I had less stress than all the taxiing and possible delays that occur with short regional flights where you spend less time in the air than getting to and from the plane..

This flight was delayed multiple times and eventually canceled around 2-3ish. Original take off time was around 10:30am. By 3, there were no other options out of Houston, so stuck in Houston for from 3pm - 11am the next day.

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Liked - nothing. Disliked - delayed 35+ min sitting on the plane. Caused me to miss my connection in Charlotte. American Airlines is the worst US Air Carrier company with atrocious customer service.

Worst situation ever! I booked my tickets for this trip on Alaska Airlines. I guess AA is a partner and we flew nonstop from Eugene to PHX on an AA jet. I had to pay for luggage from PHX to EUG. And this was an Alaska Airlines reservation paid for with Alaska airlines credit card! Got to the PHX airport and was not able to check bags because of some weird issue with the AA software. My reservation had to be the-entered by the agent. I will never pick another American Airlines flight on the Alaska Airlines website. While on vacation, I tried to upgrade our seats for the trip home. The request just buffered and never went through. I tried four times and was charged four times on my credit card. The card was charged but the seats were never changed. What a wreck!

Left from gate 30 minutes before flight. Never been late to a flight ever. It says 15 minutes before explicitly on the ticket.

I like the boarding process, it was fast. The seat doesn’t have a TV for a long flight and food wasn’t served, just snacks.

Use planes with TVs on flights over 4 hours. The free entertainment was a cheap in between solution for a very long flight that you don't even bother providing meals or decent snacks.

Even though we left CMI late, we mostly made up the time.

Delayed almost 4 hours for a 45 minute flight with no explanation.

Again, multiple delays and I eventually just canceled and drove!

Great crew. Very comfortable business seats with nice bedding. Good food. We were delayed to let late passengers on the flight, but otherwise great experience.

Great crew. We were delayed so that late passengers could get on the flight. Love the bedding in business class. Good food. Great experience.

They canceled the flight on us very close to the flight date .

It took 66 hours to get from Seattle to Tel Aviv. As a minor, I was left for more than 12 hours in Toronto and Frankfurt without hotel and food vouchers. It took 5 layovers. It was insane and not okay

It was delayed but got us to YYZ. I had great copassengers.

Flew SEA-CA, then CA-NRT. First flight was short but very uncomfortable, dirty, and had very small overhead storage space. The seats and fans were not cleaned and had visible dirt on them. Second flight was perfect.

My second flight ended up being through United and it was fine. Again, just frustrating that it was so late.

My experience was pretty frustrating because the first leg of my flight on United (though booked through Air Canada) was delayed causing me to miss my connecting flight on Air Canada. This could have been an easy solve as there was a direct flight later that morning via Air Canada that they easily could have put me on which would have only gotten me to my destination 2 1/2 hours later but because United and Air Canada don’t seem to have good communication they gave me the run around both telling me to talk with the other which I did three times to no avail. I ended up taking the delayed flight and getting on a new connecting flight which ended up getting me to my destination 6 hours later and I missed the event I was planning to go to this evening.

Everything went smoothly and as expected. We were on time and one flight arrived early.

First time flying Air Canada and the trip was very pleasant! They did a great job getting us out of Toronto and into Rome (early!) For an international flight it was very enjoyable.

This is not a Business Class equipped airplane and even the crew apologize before take over BUT BUT Air Canada charged full business class fare

All was good, except our baggage was lost for most of a day. We are thankful that it was found quickly and delivered to our hotel. Rouge was fine outside of that problem.

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.
5/16Thu
multi-stopAir New Zealand
32h 25mSTL-SYD
5/18Sat
multi-stopAir New Zealand
61h 13mSYD-STL
$2,261
5/16Thu
multi-stop
22h 03mSTL-SYD
5/18Sat
multi-stop
20h 42mSYD-STL
$2,816
5/16Thu
multi-stop
22h 03mSTL-SYD
5/18Sat
multi-stop
21h 21mSYD-STL
$2,821
5/16Thu
multi-stopCathay Pacific
32h 10mSTL-SYD
5/18Sat
multi-stopCathay Pacific
44h 41mSYD-STL
$10,299
5/16Thu
multi-stop
26h 43mSTL-SYD
5/18Sat
multi-stop
50h 45mSYD-STL
$10,540
5/16Thu
multi-stopQantas Airways
22h 03mSTL-SYD
5/18Sat
multi-stopQantas Airways
29h 02mSYD-STL
$12,172
5/16Thu
multi-stop
22h 03mSTL-SYD
5/18Sat
multi-stop
21h 21mSYD-STL
$14,298

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St. Louis - Sydney Flights

Departure:

St. Louis (undefined)United States

Destination:

Sydney (SYD)Australia

Return flight deals:

Sydney - St. Louis

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