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$393+ Cheap flights from Washington to Australia

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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Mar 29 — Apr 51
Sun 3/29
Sun 4/5
1 adult, Economy
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Cheap flight deals from Washington to Australia

Cheapest flights from Washington to Australia
Explore the most affordable flight options available from Washington to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 27, 2026.

This Booking.com deal was found by Cheapflights users on 2/26. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:30 pm
SEA
-
SYD
1 stop33h 45m
ANA
Sun 6/148:55 pm
SYD
-
SEA
1 stop34h 30m
ANA
Deal found 2/26$730
This oojo deal was found by Cheapflights users on 2/25. 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 9/211:10 pm
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 9/1510:15 am
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 2/25$789
This Air Canada deal was found by Cheapflights users on 2/27. 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 3/1010:10 am
SEA
-
BNE
1 stop28h 35m
Air Canada
Sun 5/1010:00 am
BNE
-
SEA
1 stop25h 30m
Air Canada
Deal found 2/27$794
This FlightHub deal was found by Cheapflights users on 2/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2211:10 pm
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 10/711:15 am
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 2/24$801
This Air Canada deal was found by Cheapflights users on 2/27. 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 10/313:15 pm
PDX
-
BNE
1 stop23h 30m
Air Canada
Sun 11/810:45 am
BNE
-
PDX
1 stop25h 45m
Air Canada
Deal found 2/27$807
This Air Canada deal was found by Cheapflights users on 2/24. 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 3/1010:10 am
SEA
-
BNE
1 stop28h 35m
Air Canada
Fri 3/139:45 am
BNE
-
SEA
1 stop22h 16m
Air Canada
Deal found 2/24$809
This Air Canada deal was found by Cheapflights users on 2/24. 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 3/78:00 pm
SEA
-
BNE
1 stop18h 45m
Air Canada
Fri 3/139:45 am
BNE
-
SEA
1 stop26h 31m
Air Canada
Deal found 2/24$816
This oojo deal was found by Cheapflights users on 2/26. 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 9/1811:10 pm
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 9/3010:15 am
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 2/26$817
This Air Canada deal was found by Cheapflights users on 2/26. 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 4/69:50 am
PDX
-
BNE
1 stop28h 15m
Air Canada
Fri 4/1710:00 am
BNE
-
PDX
1 stop16h 10m
Air Canada
Deal found 2/26$824
This KAYAK deal was found by Cheapflights users on 2/23. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:10 pm
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Tue 9/2910:15 am
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 2/23$827
This KAYAK deal was found by Cheapflights users on 2/24. 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.
Sun 9/2011:10 pm
SEA
-
SYD
1 stop39h 50m
Philippine Airlines
Wed 10/711:15 am
SYD
-
SEA
1 stop26h 50m
Philippine Airlines
Deal found 2/24$828
This Air Canada deal was found by Cheapflights users on 2/25. 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 5/37:45 pm
PDX
-
BNE
1 stop18h 20m
Air Canada
Sun 5/1710:00 am
BNE
-
PDX
1 stop21h 45m
Air Canada
Deal found 2/25$833

Find flight deals from Washington to Australia

Keep the following information in mind while searching for Washington to Australia flight deals. Data was last updated February 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$730
(Booking.com)

One-way from

$393
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$848
Provider with most accurate pricing for Seattle/Tacoma Intl-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sydney Kingsford Smith flights.
Search Deals
From Washington to Australia
Search Deals
One-way flight from Washington to Australia
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($204 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($50 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Australia 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 27, 2026.
Use the filters below to find and compare flights from Washington to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/31

8:45 am-6:55 am

1 stop29h 10m

Sydney Kingsford Smith

Tue 6/30

9:30 am-2:36 pm

1 stop22h 06m

$894

PortlandSydney

PDX - SYD

PDXSYD

Portland

Mon 4/27

3:15 pm-7:20 am

1 stop23h 05m

Sydney Kingsford Smith

Wed 5/6

9:20 am-9:30 am

1 stop17h 10m

$914

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 6/1

11:59 am-5:00 am

2 stops24h 01m

Brisbane

Wed 6/10

8:35 pm-9:59 am

2 stops30h 24m

$939

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Wed 5/13

7:45 pm-8:15 am

1 stop19h 30m

Melbourne

Sun 5/17

10:55 am-4:33 pm

1 stop22h 38m

$944

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Thu 3/19

5:05 am-9:00 am

2 stops33h 55m

Melbourne

Tue 3/24

10:30 am-5:51 pm

2 stops25h 21m

$948

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

9:50 am-6:50 am

2 stops28h 00m

Sydney Kingsford Smith

Thu 5/14

9:15 am-4:44 pm

2 stops24h 29m

$953

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 5/13

5:00 am-6:30 am

2 stops32h 30m

Brisbane

Wed 5/27

10:30 am-10:53 pm

2 stops29h 23m

$954

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sun 5/3

5:00 am-6:30 am

2 stops32h 30m

Brisbane

Sun 5/17

10:30 am-10:54 pm

2 stops29h 24m

$954

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Tue 4/21

11:59 pm-6:30 am

2 stops37h 31m

Brisbane

Tue 5/5

10:30 am-9:09 pm

2 stops27h 39m

$954

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Fri 5/8

1:37 pm-8:15 am

1 stop25h 38m

Melbourne

Thu 5/21

10:55 am-12:08 pm

1 stop18h 13m

$956

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/26

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Washington to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Washington 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 Washington to Australia

What is the cheapest month to book a flight from State of Washington to Australia?

Currently, January is the cheapest month in which you can book a flight from State of Washington to Australia (average of $426). Flying from State of Washington to Australia in December is currently the most expensive (average of $845). 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.

Related info for your journey

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

  • How long is the flight from State of Washington to Australia?

    A quick flight from State of Washington to Australia can take about 23h 08m. ANA provides one of the quickest options available for as low as $876. There are 7744 mi between State of Washington and Australia. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from State of Washington to Australia one-way?

    One-way options have recently been found by users for as low as $253 on ANA. Other airlines that offer cheap prices include Air Canada from $366 and Qantas Airways from $380 one-way.

  • Can I find deals for flights from Washington to Australia that include hotel bookings?

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

  • How can I find direct flights from Washington to Australia?

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

  • Can I find deals for business class flights from Washington to Australia?

    Yes. Cheapflights offers flight deals from Washington to Australia 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 State of Washington to Australia?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Australia (average of $426). Flying from State of Washington to Australia in December is currently the most expensive (average of $845). 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

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

Top 10 airlines flying from Washington to Australia

Discover the top 10 airlines that operate flights from Washington to Australia. 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 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,408FlexibilityNo cancel feeOn-time75%
ANACheapest$583Average$655FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$621Average$1,275FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$779Average$1,088FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$804Average$1,033FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$812Average$1,159FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$819Average$1,275FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,261FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$1,126Average$1,268FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,218Average$1,562FlexibilityNo cancel feeOn-time81%

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