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$530+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Jun 30 — Jul 71
Tue 6/30
Tue 7/7
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 May 31, 2026.

This Expedia deal was found by Cheapflights users on 5/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1510:03 am
SEA
-
MEL
1 stop27h 42m
Multiple Airlines
Sat 8/299:45 am
MEL
-
SEA
1 stop28h 54m
Multiple Airlines
Deal found 5/27$996
This Expedia deal was found by Cheapflights users on 5/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/72:39 pm
PDX
-
MEL
1 stop23h 06m
Multiple Airlines
Fri 8/149:45 am
MEL
-
PDX
1 stop28h 03m
Multiple Airlines
Deal found 5/27$996
This Trip.com deal was found by Cheapflights users on 5/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/317:20 pm
SEA
-
SYD
1 stop19h 00m
Air Canada
Sun 6/149:20 am
SYD
-
SEA
1 stop30h 20m
Air Canada
Deal found 5/30$997
This Expedia deal was found by Cheapflights users on 5/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/47:00 am
SEA
-
MEL
1 stop30h 45m
Multiple Airlines
Thu 6/119:45 am
MEL
-
SEA
1 stop31h 14m
Multiple Airlines
Deal found 5/28$1,004
This Expedia deal was found by Cheapflights users on 5/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/125:10 pm
SEA
-
MEL
1 stop20h 35m
Multiple Airlines
Wed 8/199:45 am
MEL
-
SEA
1 stop26h 54m
Multiple Airlines
Deal found 5/28$1,008
This Expedia deal was found by Cheapflights users on 5/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/47:15 am
PDX
-
MEL
1 stop30h 30m
Multiple Airlines
Mon 6/159:45 am
MEL
-
PDX
1 stop40h 36m
Multiple Airlines
Deal found 5/26$1,016
This Expedia deal was found by Cheapflights users on 5/31. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/286:36 pm
SEA
-
SYD
1 stop18h 49m
Multiple Airlines
Wed 8/129:10 am
SYD
-
SEA
1 stop19h 42m
Multiple Airlines
Deal found 5/31$1,026
This Expedia deal was found by Cheapflights users on 5/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/242:53 pm
PDX
-
BNE
1 stop21h 07m
Multiple Airlines
Sat 9/58:35 pm
BNE
-
PDX
1 stop20h 24m
Multiple Airlines
Deal found 5/30$1,027
This Vliegwinkel deal was found by Cheapflights users on 5/26. 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 5/313:30 pm
PDX
-
SYD
1 stop22h 50m
Air Canada
Sun 6/149:20 am
SYD
-
PDX
1 stop17h 10m
Air Canada
Deal found 5/26$1,028
This Expedia deal was found by Cheapflights users on 5/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:36 pm
SEA
-
MEL
2 stops22h 39m
Multiple Airlines
Tue 8/189:45 am
MEL
-
SEA
1 stop20h 03m
Multiple Airlines
Deal found 5/30$1,034
This Air Canada deal was found by Cheapflights users on 5/30. 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 10/203:30 pm
PDX
-
BNE
1 stop22h 35m
Air Canada
Tue 11/310:45 am
BNE
-
PDX
1 stop16h 41m
Air Canada
Deal found 5/30$1,036
This Expedia deal was found by Cheapflights users on 5/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/97:26 am
SEA
-
MEL
1 stop30h 19m
Multiple Airlines
Sun 8/234:45 pm
MEL
-
SEA
2 stops23h 25m
Multiple Airlines
Deal found 5/27$1,036

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 May 31, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$996
(Expedia)

One-way from

$530
(Expedia)

Popular in

December

Cheapest in

August

Average price

$1,051
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. 18% potential increase in price ($234 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($51 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 31, 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

Sat 10/31

10:00 am-8:45 am

1 stop29h 45m

Brisbane

Sun 11/8

10:45 am-2:41 pm

1 stop21h 56m

$1,036

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 11/2

7:10 pm-1:25 pm

2 stops24h 15m

Brisbane

Mon 11/16

6:10 am-9:26 am

2 stops21h 16m

$1,082

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 10/27

5:30 pm-9:00 am

1 stop21h 30m

Melbourne

Mon 11/16

1:00 pm-2:18 pm

1 stop20h 18m

$1,092

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Tue 7/7

11:16 am-8:15 am

1 stop27h 59m

Melbourne

Tue 7/14

10:55 am-4:47 pm

1 stop22h 52m

$1,092

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 8/5

3:33 pm-8:15 am

1 stop23h 42m

Melbourne

Sun 8/23

9:30 am-9:15 pm

2 stops28h 45m

$1,093

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 7/3

2:33 pm-8:15 am

2 stops24h 42m

Melbourne

Sat 7/11

10:55 am-9:19 pm

2 stops27h 24m

$1,097

PascoMelbourne

PSC - MEL

PSCMEL

Pasco Tri Cities

Wed 7/15

1:35 pm-8:15 am

1 stop25h 40m

Melbourne

Wed 7/22

9:30 am-8:52 pm

2 stops28h 22m

$1,097

PortlandMelbourne

PDX - MEL

PDXMEL

Portland

Wed 7/1

11:05 am-8:15 am

2 stops28h 10m

Melbourne

Wed 8/19

9:30 am-5:49 pm

2 stops25h 19m

$1,097

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 10/22

7:35 pm-8:50 am

2 stops43h 15m

Melbourne

Tue 11/17

12:00 pm-2:47 pm

1 stop21h 47m

$1,104

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sat 11/7

7:10 pm-8:45 am

1 stop19h 35m

Brisbane

Wed 11/11

10:45 am-6:31 pm

1 stop25h 46m

$1,113

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/27

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 $97). Flying from State of Washington to Australia in September 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.

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 72 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.

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 30m. 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 September 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 May 31, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,402FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$385Average$1,087FlexibilityNo cancel feeOn-time67%
ANACheapest$583Average$638FlexibilityNo cancel feeOn-time80%
United AirlinesCheapest$598Average$1,261FlexibilityNo cancel feeOn-time69%
Qantas AirwaysCheapest$621Average$1,243FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$1,033FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$1,153FlexibilityNo cancel feeOn-time85%
DeltaCheapest$842Average$1,374FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$947Average$1,577FlexibilityNo cancel feeOn-time78%
Cathay PacificCheapest$1,153Average$1,271FlexibilityNo cancel feeOn-time72%

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