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$511+ Cheap flights from Missouri 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 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Dec 24 — Dec 311
Wed 12/24
Wed 12/31
1 adult, Economy
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Cheap flight deals from Missouri to Sydney

Keep the following information in mind while searching for Missouri to Sydney flight deals. Data was last updated November 24, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$957
(Expedia)

One-way from

$587
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$1,361
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 Missouri to Sydney Kingsford Smith
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One-way flight from Missouri to Sydney Kingsford Smith
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Highest demand for flights based on searches. 5% potential increase in price ($88 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Missouri to Sydney

Cheapest flights from Missouri to Sydney
Explore the most affordable flight options available from Missouri to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 24, 2025.

This oojo deal was found by Cheapflights users on 11/23. 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.
Fri 11/287:00 amSTL - SYD
2 stops46h 25mQantas Airways
Sun 12/142:05 pmSYD - STL
1 stop20h 00mQantas Airways
Deal found 11/23$1,070
This Air Canada deal was found by Cheapflights users on 11/22. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/304:05 pmSTL - SYD
2 stops48h 30mAir Canada
Thu 12/411:20 amSYD - STL
2 stops45h 09mAir Canada
Deal found 11/22$1,330
This oojo deal was found by Cheapflights users on 11/22. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/35:38 pmMCI - SYD
1 stop20h 17mQantas Airways
Wed 1/75:30 pmSYD - MCI
2 stops36h 35mQantas Airways
Deal found 11/22$1,401
This Qantas Airways deal was found by Cheapflights users on 11/22. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:55 amSTL - SYD
2 stops44h 45mQantas Airways
Sun 12/287:05 amSYD - STL
2 stops24h 59mQantas Airways
Deal found 11/22$1,481
This Air Canada deal was found by Cheapflights users on 11/22. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:35 pmSTL - SYD
2 stops24h 20mAir Canada
Mon 12/811:20 amSYD - STL
2 stops45h 09mAir Canada
Deal found 11/22$1,567
This Ovago deal was found by Cheapflights users on 11/21. 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.
Tue 11/2511:42 amSTL - SYD
1 stop26h 13mQantas Airways
Thu 11/279:55 pmSYD - STL
2 stops35h 32mQantas Airways
Deal found 11/21$1,639
This oojo deal was found by Cheapflights users on 11/22. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/236:13 pmSTL - SYD
2 stops27h 12mQantas Airways
Sun 11/306:20 amSYD - STL
2 stops27h 12mQantas Airways
Deal found 11/22$1,743
This American Airlines deal was found by Cheapflights users on 11/23. 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 11/287:00 amSTL - SYD
1 stop30h 55mAmerican Airlines
Sun 12/142:05 pmSYD - STL
1 stop22h 22mAmerican Airlines
Deal found 11/23$1,745
This Orbitz deal was found by Cheapflights users on 11/22. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/304:05 pmSTL - SYD
2 stops48h 30mMultiple Airlines
Thu 12/411:20 amSYD - STL
1 stop29h 37mMultiple Airlines
Deal found 11/22$1,752
This oojo deal was found by Cheapflights users on 11/22. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/268:10 amMCI - SYD
2 stops31h 35mAir New Zealand
Fri 11/2812:10 pmSYD - MCI
1 stop21h 27mAir New Zealand
Deal found 11/22$1,754
This Air Canada deal was found by Cheapflights users on 11/22. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/121:35 pmSTL - SYD
2 stops27h 00mMultiple Airlines
Wed 12/3111:20 amSYD - STL
2 stops45h 09mMultiple Airlines
Deal found 11/22$1,778
This oojo deal was found by Cheapflights users on 11/23. 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 12/275:40 pmMCI - SYD
2 stops27h 15mQantas Airways
Sat 1/104:15 pmSYD - MCI
2 stops46h 39mQantas Airways
Deal found 11/23$1,919

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri 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 November 24, 2025.
Use the filters below to find and compare flights from Missouri to Sydney that are best for you.

Fly from

Missouri

Fly to

Sydney

Route

Depart

Return

Price

Kansas CitySydney

MCI - SYD

MCISYD

Kansas City

Wed 4/8

6:00 am-7:20 am

2 stops34h 20m

Sydney Kingsford Smith

Tue 4/14

9:20 am-8:37 pm

2 stops26h 17m

$957

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:30 pm-7:20 am

2 stops26h 50m

Sydney Kingsford Smith

Mon 5/18

9:20 am-3:16 pm

2 stops44h 56m

$1,026

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/1

2:50 pm-8:20 am

2 stops25h 30m

Sydney Kingsford Smith

Sun 4/12

9:20 am-8:45 pm

2 stops26h 25m

$1,145

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:27 pm-7:00 am

2 stops26h 33m

Sydney Kingsford Smith

Mon 5/18

10:20 am-6:22 pm

1 stop23h 02m

$1,165

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 1/20

11:23 am-6:50 am

2 stops26h 27m

Sydney Kingsford Smith

Tue 1/27

10:40 am-9:38 pm

2 stops27h 58m

$1,165

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/1

8:30 am-7:55 am

1 stop31h 25m

Sydney Kingsford Smith

Sun 4/12

9:30 am-9:03 pm

2 stops26h 33m

$1,165

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 2/27

4:05 pm-9:35 am

2 stops48h 30m

Sydney Kingsford Smith

Wed 4/15

9:20 am-3:24 pm

2 stops45h 04m

$1,185

Kansas CitySydney

MCI - SYD

MCISYD

Kansas City

Tue 2/10

3:46 pm-8:30 am

1 stop23h 44m

Sydney Kingsford Smith

Thu 2/26

10:40 am-2:49 pm

1 stop21h 09m

$1,195

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 2/27

5:25 pm-9:15 am

1 stop22h 50m

Sydney Kingsford Smith

Wed 4/15

10:20 am-6:22 pm

1 stop23h 02m

$1,210

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

6:30 am-7:30 am

1 stop34h 00m

Sydney Kingsford Smith

Mon 5/18

9:10 am-11:16 pm

1 stop29h 06m

$1,285

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/23

Showing 1-10 of 30 results
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Best time to book a flight from Missouri to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Missouri 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.

Cheapflights Insights

Everything you need to know about your flight from Missouri to Sydney

What is the cheapest month to book a flight from Missouri to Sydney?

Currently, May is the cheapest month in which you can book a flight from Missouri to Sydney (average of $568). Flying from Missouri to Sydney in July is currently the most expensive (average of $1,239). 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 MO to SYD?

Find hourly flight availability from Missouri 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 November 24, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 9% on flights from Missouri to Sydney by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Missouri to Sydney?

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

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

How much does it cost to fly round-trip from Missouri to Sydney?

Related info for your journey

Find useful and relevant information for your journey from Missouri to Sydney. 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 Sydney from Missouri?

    Sydney Kingsford Smith (SYD) is the airport you will fly into if you book a flight from Missouri to Sydney. It is only a 4.6 mi journey from Kingsford Smith (SYD) to Sydney’s city center.

  • How long is the flight from Missouri to Sydney?

    For as low as $1,195, Air Canada can have you in Sydney from Missouri in 23h 44m. The distance from Missouri to Sydney is about 8839 mi. This flight may include one or multiple stops.

  • What are the most popular routes from Missouri to Sydney?

    The most popular route from Missouri to Sydney is Lambert-St Louis - Sydney Kingsford Smith. You may also consider Kansas City - Sydney Kingsford Smith or Columbia Regional - Sydney Kingsford Smith.

  • Can I find deals for flights from Missouri to Sydney that include hotel bookings?

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

  • How can I find direct flights from Missouri to Sydney?

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

  • Can I find deals for business class flights from Missouri to Sydney?

    Yes. Cheapflights offers flight deals from Missouri 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 Missouri to Sydney?

    Currently, May is the cheapest month in which you can book a flight from Missouri to Sydney (average of $568). Flying from Missouri to Sydney in July is currently the most expensive (average of $1,239). 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 Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Manly
Coogee

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Top 6 airlines flying from Missouri to Sydney

Discover the top 6 airlines that operate flights from Missouri 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 November 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$822Average$1,315FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$897Average$1,202FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$1,044Average$1,485FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,130Average$1,485FlexibilityNo cancel feeOn-time74%
Fiji AirwaysCheapest$1,132Average$1,222FlexibilityNo cancel feeOn-time74%
DeltaCheapest$1,211Average$1,436FlexibilityNo cancel feeOn-timeN/A

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