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$563+ Cheap flights from St. Louis (STL) to Sydney (SYD)

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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Jan 27 — Feb 31
Mon 1/27
Mon 2/3
1 adult, Economy
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The best prices from Lambert-St Louis to Sydney Kingsford Smith are usually found in March or February, booked 60 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 January 22, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,145
(StudentUniverse)

One-way from

$563
(Fiji Airways)

Popular in

December

Cheapest in

March

Average price

$1,754
Provider with most accurate pricing for Lambert-St Louis-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Sydney Kingsford Smith flights.
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From Lambert-St Louis to Sydney Kingsford Smith
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One-way flight from Lambert-St Louis to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($125 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
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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 January 22, 2025.

This StudentUniverse deal was found by Cheapflights users on 1/22. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/85:12 pmSTL - SYD
2 stops26h 18mFiji Airways
Thu 2/276:15 amSYD - STL
2 stops30h 14mFiji Airways
Deal found 1/22$1,145
This Air Canada deal was found by Cheapflights users on 1/21. 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 stops50h 50mAir Canada
Mon 9/19:20 amSYD - STL
2 stops44h 56mAir Canada
Deal found 1/21$1,228
This American Airlines deal was found by Cheapflights users on 1/22. 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.
Thu 3/66:15 amSTL - SYD
1 stop33h 45mAmerican Airlines
Thu 3/1311:15 amSYD - STL
1 stop27h 54mAmerican Airlines
Deal found 1/22$1,251
This United Airlines deal was found by Cheapflights users on 1/22. 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.
Mon 2/241:03 pmSTL - SYD
2 stops24h 57mUnited Airlines
Sun 8/2410:20 amSYD - STL
1 stop21h 43mUnited Airlines
Deal found 1/22$1,305
This Air New Zealand deal was found by Cheapflights users on 1/21. 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 New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/231:30 pmSTL - SYD
3 stops28h 15mMultiple Airlines
Mon 9/18:45 amSYD - STL
3 stops29h 33mMultiple Airlines
Deal found 1/21$1,748
This Ovago deal was found by Cheapflights users on 1/21. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/257:00 amSTL - SYD
1 stop33h 15mAir New Zealand
Fri 1/317:15 pmSYD - STL
2 stops55h 40mAir New Zealand
Deal found 1/21$1,972
This Gotogate deal was found by Cheapflights users on 1/22. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/65:33 pmSTL - SYD
3 stops56h 27mTurkish Airlines
Thu 3/139:00 pmSYD - STL
3 stops58h 31mTurkish Airlines
Deal found 1/22$2,089
This Gurufare deal was found by Cheapflights users on 1/21. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/256:03 amSTL - SYD
1 stop32h 22mQantas Airways
Mon 1/275:25 pmSYD - STL
1 stop22h 38mQantas Airways
Deal found 1/21$2,691
This AranGrant deal was found by Cheapflights users on 1/22. 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.
Thu 2/2711:04 amSTL - SYD
2 stops31h 56mCathay Pacific
Wed 3/58:45 amSYD - STL
2 stops31h 23mCathay Pacific
Deal found 1/22$3,513
This Ovago deal was found by Cheapflights users on 1/22. 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.
Fri 3/1410:45 amSTL - SYD
3 stops54h 40mLATAM Airlines
Sat 3/2211:40 amSYD - STL
3 stops40h 20mLATAM Airlines
Deal found 1/22$5,092
This Delta deal was found by Cheapflights users on 1/22. 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.
Tue 2/2510:59 amSTL - SYD
2 stops26h 51mDelta
Wed 3/511:05 amSYD - STL
2 stops29h 31mDelta
Deal found 1/22$5,159
This KAYAK deal was found by Cheapflights users on 1/22. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/221:05 pmSTL - SYD
2 stops63h 10mANA
Wed 4/29:45 pmSYD - STL
2 stops32h 51mANA
Deal found 1/22$6,931

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 January 22, 2025.

Fly from

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Fly to

Any airport

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 2/8

5:12 pm-12:30 pm

2 stops26h 18m

Sydney Kingsford Smith

Thu 2/27

6:15 am-7:29 pm

2 stops30h 14m

$1,145

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/17

1:30 pm-7:20 am

2 stops50h 50m

Sydney Kingsford Smith

Tue 7/1

9:20 am-3:16 pm

2 stops44h 56m

$1,229

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 3/20

2:22 pm-9:00 am

2 stops26h 38m

Sydney Kingsford Smith

Fri 3/28

11:15 am-11:09 pm

1 stop27h 54m

$1,244

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 2/9

2:49 pm-3:35 pm

2 stops31h 46m

Sydney Kingsford Smith

Sat 2/15

6:00 am-7:29 pm

2 stops30h 29m

$1,358

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 3/14

4:33 pm-7:00 am

1 stop22h 27m

Sydney Kingsford Smith

Sat 3/22

11:50 am-8:54 pm

1 stop25h 04m

$1,555

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 2/9

6:15 am-8:45 am

2 stops33h 30m

Sydney Kingsford Smith

Sat 2/15

12:10 pm-6:56 pm

1 stop23h 46m

$2,011

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 2/20

5:36 pm-7:00 pm

3 stops56h 24m

Sydney Kingsford Smith

Fri 2/28

9:00 pm-3:40 pm

3 stops59h 40m

$2,083

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 3/21

6:15 am-5:40 pm

3 stops43h 25m

Sydney Kingsford Smith

Mon 3/31

6:30 pm-11:09 pm

2 stops44h 39m

$3,222

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 3/21

10:45 am-9:25 am

3 stops54h 40m

Sydney Kingsford Smith

Mon 3/31

12:50 pm-12:00 pm

3 stops39h 10m

$3,296

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 2/27

11:04 am-12:00 pm

2 stops31h 56m

Sydney Kingsford Smith

Wed 3/5

8:45 am-11:08 pm

2 stops31h 23m

$3,513

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 18 results
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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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-Sydney flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 January 17, 2025.

The best time to book flights from St. Louis to Sydney is 60 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 January 22, 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 January 22, 2025.
ANA
8.4
Very good
849 reviews

Comfort

8.2

Crew

8.7

Overall

8.4

Entertainment

7.9

Food

7.7

Boarding

8.6

Reviews

1 / 10

Your hospitality was excellent, very polite and kind. The meal was tasty and good. The buns were cold. Who likes cold buns?

ANA
8.4
Very good
849 reviews
ANA
8.4
Very good
849 reviews

Comfort

8.2

Crew

8.7

Overall

8.4

Entertainment

7.9

Food

7.7

Boarding

8.6

Reviews

1 / 10

Your hospitality was excellent, very polite and kind. The meal was tasty and good. The buns were cold. Who likes cold buns?

Fiji Airways
8.1
Very good
188 reviews
ANA
8.4
Very good
849 reviews

Comfort

8.2

Crew

8.7

Overall

8.4

Entertainment

7.9

Food

7.7

Boarding

8.6

Reviews

1 / 10

Your hospitality was excellent, very polite and kind. The meal was tasty and good. The buns were cold. Who likes cold buns?

Delta
8.0
Very good
8,514 reviews
ANA
8.4
Very good
849 reviews

Comfort

8.2

Crew

8.7

Overall

8.4

Entertainment

7.9

Food

7.7

Boarding

8.6

Reviews

1 / 10

Your hospitality was excellent, very polite and kind. The meal was tasty and good. The buns were cold. Who likes cold buns?

Alaska Airlines
8.0
Very good
9,707 reviews
ANA
8.4
Very good
849 reviews

Comfort

8.2

Crew

8.7

Overall

8.4

Entertainment

7.9

Food

7.7

Boarding

8.6

Reviews

1 / 10

Your hospitality was excellent, very polite and kind. The meal was tasty and good. The buns were cold. Who likes cold buns?

Air New Zealand
7.9
Good
482 reviews
ANA
8.4
Very good
849 reviews

Comfort

8.2

Crew

8.7

Overall

8.4

Entertainment

7.9

Food

7.7

Boarding

8.6

Reviews

1 / 10

Your hospitality was excellent, very polite and kind. The meal was tasty and good. The buns were cold. Who likes cold buns?

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 ($1,145), Air Canada ($1,235), and American Airlines ($1,251) 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

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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 January 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$942Average$1,551FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$962Average$1,297FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,035Average$1,452FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,134Average$1,464FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,303Average$1,644FlexibilityNo cancel feeOn-time74%
Air New ZealandCheapest$1,404Average$1,836FlexibilityNo cancel feeOn-time78%
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