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$469+ 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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
May 29 — Jun 51
Fri 5/29
Fri 6/5
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 April 29, 2026.

This Vliegwinkel deal was found by Cheapflights users on 4/26. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/37:20 pm
SEA
-
SYD
1 stop19h 00m
Air Canada
Tue 5/199:20 am
SYD
-
SEA
1 stop17h 45m
Air Canada
Deal found 4/26$1,033
This oojo deal was found by Cheapflights users on 4/29. 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.
Mon 6/16:14 pm
SEA
-
SYD
1 stop20h 16m
Multiple Airlines
Mon 6/299:10 am
SYD
-
SEA
1 stop19h 42m
Multiple Airlines
Deal found 4/29$1,052
This lastminute.com deal was found by Cheapflights users on 4/26. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/34:30 pm
SEA
-
SYD
1 stop33h 40m
ANA
Tue 5/198:55 pm
SYD
-
SEA
1 stop34h 30m
ANA
Deal found 4/26$1,054
This Vliegwinkel deal was found by Cheapflights users on 4/29. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:31 pm
SEA
-
SYD
1 stop20h 34m
Multiple Airlines
Fri 6/59:10 am
SYD
-
SEA
1 stop19h 51m
Multiple Airlines
Deal found 4/29$1,055
This oojo deal was found by Cheapflights users on 4/28. 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.
Mon 5/186:40 pm
SEA
-
SYD
1 stop19h 50m
Multiple Airlines
Wed 6/39:10 am
SYD
-
SEA
1 stop18h 51m
Multiple Airlines
Deal found 4/28$1,060
This lastminute.com deal was found by Cheapflights users on 4/28. 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.
Thu 7/302:20 pm
SEA
-
SYD
1 stop23h 45m
Qantas Airways
Tue 8/255:50 pm
SYD
-
SEA
1 stop18h 52m
Qantas Airways
Deal found 4/28$1,065
This oojo deal was found by Cheapflights users on 4/29. 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 8/12:20 pm
SEA
-
SYD
1 stop23h 45m
Qantas Airways
Fri 8/145:50 pm
SYD
-
SEA
1 stop20h 06m
Qantas Airways
Deal found 4/29$1,069
This Air Canada deal was found by Cheapflights users on 4/28. 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.
Wed 5/1310:10 am
PDX
-
BNE
1 stop27h 55m
Air Canada
Wed 5/2710:00 am
BNE
-
PDX
1 stop26h 10m
Air Canada
Deal found 4/28$1,071
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/114:30 pm
SEA
-
SYD
1 stop33h 40m
ANA
Tue 5/198:55 pm
SYD
-
SEA
1 stop34h 30m
ANA
Deal found 4/29$1,071
This Air Canada deal was found by Cheapflights users on 4/28. 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 7/33:30 pm
PDX
-
BNE
1 stop22h 35m
Air Canada
Mon 7/1310:00 am
BNE
-
PDX
1 stop26h 11m
Air Canada
Deal found 4/28$1,072
This American Airlines deal was found by Cheapflights users on 4/28. 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 7/3011:40 am
SEA
-
MEL
2 stops26h 05m
American Airlines
Tue 8/259:45 am
MEL
-
SEA
1 stop23h 47m
American Airlines
Deal found 4/28$1,074
This Justfly.com deal was found by Cheapflights users on 4/28. 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.
Sat 5/163:30 pm
PDX
-
BNE
1 stop22h 35m
Air Canada
Wed 6/1010:00 am
BNE
-
PDX
1 stop26h 10m
Air Canada
Deal found 4/28$1,081

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 April 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,052
(oojo)

One-way from

$469
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$1,065
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 ($206 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 29, 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

Cheapest round-trip

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 5/13

3:30 pm-7:05 am

1 stop22h 35m

Brisbane

Wed 5/27

10:00 am-2:45 pm

1 stop21h 45m

$1,071

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 8/15

5:22 pm-8:15 am

1 stop21h 53m

Melbourne

Thu 9/3

10:55 am-2:22 pm

1 stop20h 27m

$1,092

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 8/15

10:54 am-8:15 am

1 stop28h 21m

Melbourne

Sun 8/30

9:30 am-11:33 am

1 stop19h 03m

$1,092

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 8/4

11:16 am-8:15 am

1 stop27h 59m

Melbourne

Tue 8/18

10:55 am-12:07 pm

1 stop18h 12m

$1,092

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 6/9

11:02 am-8:15 am

2 stops28h 13m

Melbourne

Tue 6/16

10:55 am-5:59 pm

2 stops24h 04m

$1,097

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 6/7

5:00 am-8:15 am

2 stops34h 15m

Melbourne

Wed 6/17

10:55 am-12:34 pm

1 stop18h 39m

$1,097

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Sun 8/9

5:00 am-8:15 am

2 stops34h 15m

Melbourne

Sat 8/22

10:55 am-8:55 pm

2 stops27h 00m

$1,097

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Wed 5/27

12:50 pm-8:15 am

2 stops26h 25m

Melbourne

Wed 6/3

9:30 am-5:44 pm

2 stops25h 14m

$1,097

PascoMelbourne

PSC - MEL

PSCMEL

Pasco Tri Cities

Thu 6/11

1:35 pm-8:15 am

1 stop25h 40m

Melbourne

Thu 6/18

10:55 am-12:50 am

1 stop30h 55m

$1,099

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 5/13

10:10 am-7:05 am

1 stop27h 55m

Brisbane

Wed 5/27

7:25 pm-9:30 am

2 stops31h 05m

$1,100

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

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

How far ahead should I book a flight from State of Washington to Australia?

The best time to book flights from State of Washington to Australia is 23 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 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 $97). Flying from State of Washington to Australia in March is currently the most expensive (average of $778). 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 21h 53m. Air Canada provides one of the quickest options available for as low as $1,092. There are 8180 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 $97). Flying from State of Washington to Australia in March is currently the most expensive (average of $778). 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 April 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,397FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$385Average$1,089FlexibilityNo cancel feeOn-time67%
ANACheapest$583Average$655FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$621Average$1,275FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$1,011FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$1,153FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$833Average$1,280FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,452FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$947Average$1,220FlexibilityNo cancel feeOn-time78%
Alaska AirlinesCheapest$1,126Average$1,268FlexibilityNo cancel feeOn-timeN/A

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