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Cheap flights from Australia to St. Louis from $863

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/1. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Australia to St. Louis

Keep the following information in mind while searching for Australia to St. Louis flight deals. Data was last updated 31 October 2025.

Round-trip from

$1,337

One-way from

$863

Popular in

December

Cheapest in

November

Average price

$1,910
Air Canada
  • Air Canada
  • 12/3-16/3
  • 4 total stops
  • 70h 39m total
  • Australia to St. Louis
Search Deals
18/1
  • 18/1
  • 3 total stops
  • 59h 39m total
  • Australia to St. Louis
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($61 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from Australia to St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from Australia to St. Louis
Explore the most affordable flight options available from Australia to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 October 2025.

Mon 24/1111:20SYD - STL
2 stops45h 09mAir Canada
Sun 30/1116:05STL - SYD
2 stops48h 30mAir Canada
Deal found 30/10$1,393
Sun 21/1211:30MEL - STL
2 stops41h 57mUnited Airlines
Wed 28/115:11STL - MEL
2 stops25h 19mUnited Airlines
Deal found 31/10$1,421
Mon 24/1111:20SYD - STL
1 stop29h 22mAmerican Airlines
Sun 30/1107:00STL - SYD
1 stop33h 00mAmerican Airlines
Deal found 30/10$1,483
Mon 24/1111:50SYD - STL
2 stops22h 49mUnited Airlines
Sun 30/1111:20STL - SYD
1 stop26h 40mUnited Airlines
Deal found 30/10$1,509
Sun 14/1217:45SYD - STL
1 stop23h 12mAmerican Airlines
Sun 21/1206:20STL - SYD
1 stop32h 05mAmerican Airlines
Deal found 30/10$2,630
Sun 21/1212:00MEL - STL
1 stop28h 51mQantas Airways
Wed 28/111:55STL - MEL
1 stop24h 05mQantas Airways
Deal found 31/10$2,683
Sun 14/1217:45SYD - STL
1 stop23h 12mQantas Airways
Sun 21/1206:20STL - SYD
1 stop32h 05mQantas Airways
Deal found 30/10$2,720
Thu 20/1106:30LST - STL
2 stops34h 12mQantas Airways
Mon 24/1107:00STL - LST
2 stops44h 00mQantas Airways
Deal found 28/10$3,067
Thu 20/1106:30DPO - STL
2 stops34h 12mQantas Airways
Mon 24/1113:20STL - DPO
2 stops34h 15mQantas Airways
Deal found 27/10$3,148
Sun 21/1213:30MEL - STL
3 stops27h 15mMultiple Airlines
Wed 28/117:12STL - MEL
2 stops24h 08mMultiple Airlines
Deal found 31/10$3,464
Sat 20/1200:45MEL - STL
2 stops33h 01mCathay Pacific
Wed 28/111:05STL - MEL
2 stops32h 25mCathay Pacific
Deal found 31/10$4,474
Sun 14/1208:30SYD - STL
3 stops27h 35mMultiple Airlines
Sun 21/1211:41STL - SYD
2 stops27h 54mMultiple Airlines
Deal found 30/10$4,484

Cheapflights Fare Finder

 
Customise your flight search to find flights from Australia to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 31 October 2025.
Use the filters below to find and compare flights from Australia to St. Louis that are best for you.

Fly from

Australia

Fly to

St. Louis

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

10:25-15:29

2 stops45h 04m

Lambert-St Louis

Mon 16/3

15:00-08:35

2 stops25h 35m

$1,337

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

Sun 30/11

16:05-09:35

2 stops48h 30m

$1,393

BrisbaneSt. Louis

BNE - STL

BNESTL

Brisbane

Sun 8/3

10:45-14:29

2 stops43h 44m

Lambert-St Louis

Tue 10/3

17:54-07:45

2 stops46h 51m

$1,399

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:20-23:42

1 stop29h 22m

Lambert-St Louis

Sun 30/11

07:00-09:00

1 stop33h 00m

$1,483

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:50-17:39

2 stops22h 49m

Lambert-St Louis

Sun 30/11

11:20-07:00

1 stop26h 40m

$1,509

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Fri 6/3

11:30-16:52

2 stops22h 22m

Lambert-St Louis

Tue 10/3

16:35-09:00

2 stops48h 25m

$1,648

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Fri 6/3

16:05-19:26

1 stop20h 21m

Lambert-St Louis

Tue 10/3

17:59-05:00

1 stop43h 01m

$1,705

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Fri 6/3

10:10-18:04

2 stops24h 54m

Lambert-St Louis

Tue 10/3

17:30-07:00

2 stops45h 30m

$1,712

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sun 5/4

09:30-16:26

2 stops21h 56m

Lambert-St Louis

Sat 11/4

16:30-08:15

2 stops48h 45m

$1,967

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 10/1

08:45-19:51

2 stops28h 06m

Lambert-St Louis

Sun 7/6

06:30-07:05

1 stop33h 35m

$1,975

Flights are sorted by cheapest return flights first.

Deals found on 29/10

Showing 1-10 of 34 results
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Best time to book a flight from Australia to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Australia with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Australia to St. Louis?

Currently, December is the cheapest month in which you can book a flight from Australia to St. Louis (average of $1,121). Flying from Australia to St. Louis in April is currently the most expensive (average of $1,678). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from AU to STL?

Find hourly flight availability from Australia to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 October 2025.

One of the essential ways to save on airfare from Australia to St. Louis is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the morning could potentially save you up to 9% on airfare.

What is the cheapest day to fly from Australia to St. Louis?

Use this chart to determine the cheapest time to fly return from Australia to St. Louis. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their Australia to St. Louis flight should consider departing on Sunday mornings when fares are most often at their lowest. Saturday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated 31 October 2025.
Read reviews from past customers who have flown with Qantas Airways, United Airlines, andAir Canada from Australia to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
Qantas Airways
7.5
Good
926 reviews
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
United Airlines
7.4
Good
8,995 reviews
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
Air Canada
7.1
Good
10,385 reviews
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.

Related info for your journey

Find useful and relevant information for your journey from Australia to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from Australia?

    Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Australia. Lambert-St Louis is conveniently located just 20.4 km from St. Louis’s city centre.

  • How long is the flight from Australia to St. Louis?

    Air Canada, American Airlines, and United Airlines can get you from Australia to St. Louis in just under 22h 49m. Your travel time can differ by up to 22h 15m. Airlines will cover a distance of 14571 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most popular routes from Australia to St. Louis?

    Most travellers choose Sydney Kingsford Smith - Lambert-St Louis, Melbourne - Lambert-St Louis or Devonport - Lambert-St Louis when deciding on the best route from Australia to St. Louis.

  • Can I find deals for flights from Australia to St. Louis that include hotel bookings?

    Yes. In addition to deals on Australia to St. Louis flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Australia to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Australia to St. Louis.

  • Can I find deals for business class flights from Australia to St. Louis?

    Yes. Cheapflights offers flight deals from Australia to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Australia to St. Louis?

    Currently, December is the cheapest month in which you can book a flight from Australia to St. Louis (average of $1,121). Flying from Australia to St. Louis in April is currently the most expensive (average of $1,678). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Australia to St. Louis

Discover the top 3 airlines that operate flights from Australia to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,155Average$1,776FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,246Average$2,129FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Qantas AirwaysCheapest$1,507Average$2,264FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Australia to St. Louis?

When you search for this flight from Australia to St. Louis, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Australia to St. Louis?

Cheapflights simply makes it quick and affordable to book flights from Australia to St. Louis by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Australia to St. Louis with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Australia to St. Louis flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Australia to St. Louis become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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