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$504+ 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 3/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Apr 10 — Apr 171
Fri 4/10
Fri 4/17
1 adult, Economy
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Cheap 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 March 11, 2026.

This lastminute.com deal was found by Cheapflights users on 3/6. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:21 am
STL
-
SYD
2 stops35h 59m
Qantas Airways
Mon 4/2712:00 pm
SYD
-
STL
1 stop20h 21m
Qantas Airways
Deal found 3/6$1,128
This oojo deal was found by Cheapflights users on 3/6. 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.
Tue 11/105:35 pm
MCI
-
SYD
1 stop20h 20m
Qantas Airways
Sun 12/206:00 am
SYD
-
MCI
2 stops24h 08m
Qantas Airways
Deal found 3/6$1,143
This oojo deal was found by Cheapflights users on 3/7. 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 12/93:59 pm
STL
-
SYD
1 stop21h 56m
Qantas Airways
Tue 12/157:00 am
SYD
-
STL
2 stops22h 32m
Qantas Airways
Deal found 3/7$1,143
This oojo deal was found by Cheapflights users on 3/6. 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 4/196:21 am
STL
-
SYD
2 stops37h 34m
Qantas Airways
Sat 4/2512:00 pm
SYD
-
STL
1 stop22h 30m
Qantas Airways
Deal found 3/6$1,146
This Air Canada deal was found by Cheapflights users on 3/8. 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.
Mon 5/45:17 pm
MCI
-
SYD
2 stops23h 03m
Multiple Airlines
Sat 5/99:20 am
SYD
-
MCI
2 stops25h 50m
Multiple Airlines
Deal found 3/8$1,171
This United Airlines deal was found by Cheapflights users on 3/6. 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 4/207:05 pm
STL
-
SYD
1 stop20h 50m
United Airlines
Mon 4/2710:20 am
SYD
-
STL
1 stop23h 04m
United Airlines
Deal found 3/6$1,194
This Priceline deal was found by Cheapflights users on 3/6. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/17:10 pm
MCI
-
SYD
2 stops45h 10m
Air Canada
Fri 7/179:20 am
SYD
-
MCI
2 stops29h 05m
Air Canada
Deal found 3/6$1,199
This United Airlines deal was found by Cheapflights users on 3/6. 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 9/74:40 pm
STL
-
SYD
2 stops23h 15m
United Airlines
Mon 9/1410:20 am
SYD
-
STL
1 stop23h 04m
United Airlines
Deal found 3/6$1,199
This Qantas Airways deal was found by Cheapflights users on 3/6. 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.
Thu 4/306:21 am
STL
-
SYD
2 stops35h 59m
Qantas Airways
Mon 5/412:00 pm
SYD
-
STL
1 stop20h 21m
Qantas Airways
Deal found 3/6$1,200
This Orbitz deal was found by Cheapflights users on 3/7. 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.
Fri 8/141:45 pm
MCI
-
SYD
2 stops26h 35m
Air Canada
Fri 8/219:20 am
SYD
-
MCI
2 stops42h 19m
Air Canada
Deal found 3/7$1,207
This Air Canada deal was found by Cheapflights users on 3/6. 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.
Tue 4/211:54 pm
MCI
-
SYD
2 stops26h 26m
Multiple Airlines
Tue 4/289:20 am
SYD
-
MCI
2 stops21h 56m
Multiple Airlines
Deal found 3/6$1,208
This oojo deal was found by Cheapflights users on 3/9. 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.
Tue 10/204:17 pm
STL
-
SYD
2 stops24h 28m
Air New Zealand
Wed 11/49:55 am
SYD
-
STL
2 stops25h 43m
Air New Zealand
Deal found 3/9$1,216

Find flight deals from Missouri to Sydney

Keep the following information in mind while searching for Missouri to Sydney flight deals. Data was last updated March 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,128
(lastminute.com)

One-way from

$504
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,254
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 Missouri to Sydney Kingsford Smith
Search Deals
One-way flight from Missouri to Sydney Kingsford Smith
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($80 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 11, 2026.
Use the filters below to find and compare flights from Missouri to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:46 pm-6:50 am

2 stops26h 04m

Sydney Kingsford Smith

Mon 5/18

9:15 am-9:09 pm

2 stops26h 54m

$1,199

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 4/30

6:21 am-9:20 am

2 stops35h 59m

Sydney Kingsford Smith

Mon 5/4

12:00 pm-5:21 pm

1 stop20h 21m

$1,200

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/23

8:52 am-6:55 am

1 stop31h 03m

Sydney Kingsford Smith

Sat 8/29

10:20 am-6:24 pm

1 stop23h 04m

$1,235

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 5/7

2:35 pm-7:00 am

2 stops25h 25m

Sydney Kingsford Smith

Tue 5/12

9:30 am-7:51 pm

2 stops25h 21m

$1,240

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

7:45 am-8:45 am

3 stops34h 00m

Sydney Kingsford Smith

Mon 5/18

9:55 am-10:30 pm

2 stops27h 35m

$1,319

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/20

7:45 am-8:45 am

3 stops34h 00m

Sydney Kingsford Smith

Wed 6/10

11:55 am-11:57 pm

3 stops27h 02m

$1,374

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 4/24

9:10 am-8:45 am

3 stops32h 35m

Sydney Kingsford Smith

Fri 5/1

11:55 am-10:30 pm

2 stops25h 35m

$1,414

Kansas CitySydney

MCI - SYD

MCISYD

Kansas City

Wed 7/1

4:26 pm-7:00 am

1 stop23h 34m

Sydney Kingsford Smith

Fri 7/17

9:30 am-3:45 pm

1 stop21h 15m

$1,453

Kansas CitySydney

MCI - SYD

MCISYD

Kansas City

Sat 7/18

12:16 pm-6:50 am

2 stops27h 34m

Sydney Kingsford Smith

Wed 7/29

9:15 am-2:45 pm

1 stop20h 30m

$1,458

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/18

6:21 am-7:05 am

1 stop33h 44m

Sydney Kingsford Smith

Tue 8/11

9:10 am-11:08 pm

1 stop28h 58m

$1,494

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 40 resultsSorted by cheapest first
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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, August is the cheapest month in which you can book a flight from Missouri to Sydney (average of $649). Flying from Missouri to Sydney in May is currently the most expensive (average of $1,229). 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.

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 $1,199, Delta can have you in Sydney from Missouri in 26h 04m. The distance from Missouri to Sydney is about 9054 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 Kansas City - Sydney Kingsford Smith. You may also consider Lambert-St Louis - 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, August is the cheapest month in which you can book a flight from Missouri to Sydney (average of $649). Flying from Missouri to Sydney in May is currently the most expensive (average of $1,229). 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
Coogee
Manly

Browse thousands of different options on Cheapflights for your next trip

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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 March 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$551Average$1,318FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$608Average$1,173FlexibilityNo cancel feeOn-time67%
DeltaCheapest$917Average$1,466FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$1,044Average$1,486FlexibilityNo cancel feeOn-time71%
Qantas AirwaysCheapest$1,130Average$1,404FlexibilityNo cancel feeOn-time74%
Fiji AirwaysCheapest$1,132Average$1,222FlexibilityNo cancel feeOn-time74%

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