HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sydney

$1,148+ Cheap flights from St. Louis (STL) to Sydney (SYD)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Feb 26 — Mar 51
Wed 2/26
Wed 3/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Sydney with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Lambert-St Louis to Sydney Kingsford Smith are usually found in November or August, booked 33 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from St. Louis to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,148
(oojo)

Popular in

December

Cheapest in

November

Average price

$1,427
Provider with most accurate pricing for Lambert-St Louis-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Sydney Kingsford Smith flights.
Search Deals
From Lambert-St Louis to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($129 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
Search Deals

Find flight deals from St. Louis to Sydney

Cheapest flights from St. Louis to Sydney
Explore the most affordable flight options available from St. Louis to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 21, 2025.

This oojo deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/107:05 pmSTL - SYD
2 stops25h 40mFiji Airways
Sat 5/311:45 pmSYD - STL
2 stops24h 02mFiji Airways
Deal found 2/19$1,148
This Gurufare deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/144:50 pmSTL - SYD
2 stops26h 45mAir New Zealand
Wed 5/289:55 amSYD - STL
2 stops25h 54mAir New Zealand
Deal found 2/20$1,171
This Air Canada deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/231:30 pmSTL - SYD
2 stops26h 50mAir Canada
Mon 9/19:20 amSYD - STL
2 stops25h 40mAir Canada
Deal found 2/21$1,235
This Air New Zealand deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/141:41 pmSTL - SYD
3 stops29h 54mMultiple Airlines
Wed 5/2811:50 amSYD - STL
3 stops27h 09mMultiple Airlines
Deal found 2/20$1,286
This Justfly.com deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/215:37 pmSTL - SYD
2 stops44h 58mQantas Airways
Fri 2/2811:15 amSYD - STL
1 stop28h 53mQantas Airways
Deal found 2/20$1,343
This American Airlines deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/213:43 pmSTL - SYD
2 stops24h 17mAmerican Airlines
Fri 2/2811:15 amSYD - STL
2 stops22h 18mAmerican Airlines
Deal found 2/20$1,346
This United Airlines deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/26:15 amSTL - SYD
1 stop31h 45mUnited Airlines
Mon 3/1011:50 amSYD - STL
1 stop19h 26mUnited Airlines
Deal found 2/19$1,357
This Delta deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/211:50 amSTL - SYD
2 stops27h 45mDelta
Mon 3/101:15 pmSYD - STL
2 stops21h 18mDelta
Deal found 2/19$1,371
This Mytrip deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/73:43 pmSTL - SYD
3 stops36h 17mTurkish Airlines
Sun 5/118:55 pmSYD - STL
3 stops56h 52mTurkish Airlines
Deal found 2/20$2,552
This British Airways deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/311:57 amSTL - SYD
3 stops49h 58mBritish Airways
Mon 3/104:20 pmSYD - STL
3 stops45h 58mBritish Airways
Deal found 2/19$3,763
This Ovago deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/310:26 amSTL - SYD
2 stops38h 14mLATAM Airlines
Tue 3/1111:40 amSYD - STL
3 stops40h 20mLATAM Airlines
Deal found 2/19$4,080
This AranGrant deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/48:25 amSTL - SYD
2 stops43h 50mANA
Wed 6/1811:50 amSYD - STL
2 stops39h 30mANA
Deal found 2/20$6,274

Find flights from St. Louis to Sydney within your budget

Customize your flight search to find flights from St. Louis to Sydney 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 2,558,603 searches. Data last updated February 21, 2025.

Fly from

St. Louis

Fly to

Sydney

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 5/10

7:05 pm-11:45 am

2 stops25h 40m

Sydney Kingsford Smith

Sat 5/31

1:45 pm-10:47 pm

2 stops24h 02m

$1,148

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/14

4:50 pm-10:35 am

2 stops26h 45m

Sydney Kingsford Smith

Wed 5/28

9:55 am-8:49 pm

2 stops25h 54m

$1,171

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 4/5

3:30 pm-7:20 am

2 stops48h 50m

Sydney Kingsford Smith

Sat 4/19

9:20 am-2:49 pm

2 stops44h 29m

$1,248

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/14

1:41 pm-10:35 am

3 stops29h 54m

Sydney Kingsford Smith

Wed 5/28

11:50 am-11:59 pm

3 stops27h 09m

$1,286

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/10

3:48 pm-9:00 am

2 stops25h 12m

Sydney Kingsford Smith

Fri 3/21

11:15 am-5:59 pm

2 stops22h 44m

$1,346

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/4

10:55 am-7:00 am

1 stop27h 05m

Sydney Kingsford Smith

Tue 3/11

11:50 am-3:16 pm

1 stop19h 26m

$1,357

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 3/22

6:50 am-7:45 am

2 stops32h 55m

Sydney Kingsford Smith

Sat 3/29

1:15 pm-9:10 am

2 stops35h 55m

$1,562

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 3/21

6:15 am-9:00 am

1 stop34h 45m

Sydney Kingsford Smith

Sun 3/23

11:15 am-11:09 pm

1 stop27h 54m

$2,129

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/7

3:43 pm-7:00 pm

3 stops36h 17m

Sydney Kingsford Smith

Sun 5/11

8:55 pm-2:47 pm

3 stops56h 52m

$2,552

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/3

11:57 am-6:55 am

3 stops49h 58m

Sydney Kingsford Smith

Mon 3/10

4:20 pm-10:18 pm

3 stops45h 58m

$3,763

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 12 results
1
2

Compare providers for flights from St. Louis to Sydney

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Sydney in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Sydney flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Sydney flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Sydney flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Sydney flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Sydney flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from St. Louis with our price prediction graph.
Estimated round-trip 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.

Travel insights for flights from St. Louis to Sydney

Get recent, data-driven insights about flights from St. Louis to Sydney including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Sydney. Price data was last updated on February 14, 2025.

The best time to book flights from St. Louis to Sydney is 32 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, February is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,051). Flying from St. Louis to Sydney in December is currently the most expensive (average of $1,643). 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 STL to SYD?

Find hourly flight availability from St. Louis to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 21, 2025.

It’s optimal to fly from St. Louis to Sydney in the evening. By choosing this option you can save up to 24% on the cost of your flight, compared to a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Sydney. Price data was last updated on December 16, 2024.

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

Rainfall in Sydney by month

Plan your trip to Sydney by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sydney ranges from 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Sydney when rainfall is around 2.0 in.

Temperature in Sydney by month

Plan your trip to Sydney by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated February 21, 2025.
Get a feel of what it's like to fly with ANA, Fiji Airways and Delta from St. Louis to Sydney by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very good
842 reviews

Crew

8.7

Overall

8.4

Boarding

8.5

Entertainment

7.9

Food

7.7

Comfort

8.2

Reviews

1 / 20

10.0
Excellent

Anonymous,Feb 2025

MNL - HND

Great experience! Roomy economy leg room with foot rest, great crew and accommodations. Highly recommend!

ANA
8.4
Very good
842 reviews
ANA
8.4
Very good
842 reviews

Crew

8.7

Overall

8.4

Boarding

8.5

Entertainment

7.9

Food

7.7

Comfort

8.2

Reviews

1 / 20

10.0
Excellent

Anonymous,Feb 2025

MNL - HND

Great experience! Roomy economy leg room with foot rest, great crew and accommodations. Highly recommend!

Fiji Airways
8.0
Very good
184 reviews
ANA
8.4
Very good
842 reviews

Crew

8.7

Overall

8.4

Boarding

8.5

Entertainment

7.9

Food

7.7

Comfort

8.2

Reviews

1 / 20

10.0
Excellent

Anonymous,Feb 2025

MNL - HND

Great experience! Roomy economy leg room with foot rest, great crew and accommodations. Highly recommend!

Delta
8.0
Very good
8,219 reviews
ANA
8.4
Very good
842 reviews

Crew

8.7

Overall

8.4

Boarding

8.5

Entertainment

7.9

Food

7.7

Comfort

8.2

Reviews

1 / 20

10.0
Excellent

Anonymous,Feb 2025

MNL - HND

Great experience! Roomy economy leg room with foot rest, great crew and accommodations. Highly recommend!

Air New Zealand
7.9
Good
460 reviews
ANA
8.4
Very good
842 reviews

Crew

8.7

Overall

8.4

Boarding

8.5

Entertainment

7.9

Food

7.7

Comfort

8.2

Reviews

1 / 20

10.0
Excellent

Anonymous,Feb 2025

MNL - HND

Great experience! Roomy economy leg room with foot rest, great crew and accommodations. Highly recommend!

LATAM Airlines
7.5
Good
1,793 reviews
ANA
8.4
Very good
842 reviews

Crew

8.7

Overall

8.4

Boarding

8.5

Entertainment

7.9

Food

7.7

Comfort

8.2

Reviews

1 / 20

10.0
Excellent

Anonymous,Feb 2025

MNL - HND

Great experience! Roomy economy leg room with foot rest, great crew and accommodations. Highly recommend!

Related info for your journey

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

  • What are the cheapest airlines flying from St. Louis to Sydney round-trip?

    According to our current data, Fiji Airways ($1,148), Air New Zealand ($1,171), and Air Canada ($1,248) offers the cheapest pricing from St. Louis to Sydney. Fiji Airways is priced at 26% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Sydney 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 St. Louis to Sydney?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Sydney (average of $1,051). Flying from St. Louis to Sydney in December is currently the most expensive (average of $1,643). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Wollongong
Parramatta
Coogee
Manly

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Sydney flights
Columbia to Sydney flights
Springfield to Coolangatta flights

Top 6 airlines flying from St. Louis to Sydney

Discover the top 6 airlines that operate flights from St. Louis to Sydney. 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 2,558,603 searches. Data last updated February 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$942Average$1,468FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$962Average$1,297FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$1,193Average$1,467FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$1,201Average$1,465FlexibilityNo cancel feeOn-time69%
Qantas AirwaysCheapest$1,281Average$1,618FlexibilityNo cancel feeOn-time74%
Air New ZealandCheapest$1,404Average$1,836FlexibilityNo cancel feeOn-time78%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.