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$377+ 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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Jan 31 — Feb 71
Sat 1/31
Sat 2/7
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 January 1, 2026.

This United Airlines deal was found by Cheapflights users on 12/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:12 pmSEA - BNE
1 stop18h 18mUnited Airlines
Fri 1/1611:40 amBNE - SEA
1 stop24h 47mUnited Airlines
Deal found 12/31$870
This United Airlines deal was found by Cheapflights users on 12/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:12 pmSEA - MEL
1 stop19h 48mUnited Airlines
Mon 2/21:00 pmMEL - SEA
1 stop21h 44mUnited Airlines
Deal found 12/30$1,012
This Justfly.com deal was found by Cheapflights users on 12/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:00 amSEA - SYD
1 stop32h 00mQantas Airways
Wed 1/74:20 pmSYD - SEA
2 stops44h 45mQantas Airways
Deal found 12/30$1,160
This Air Canada deal was found by Cheapflights users on 12/31. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:40 pmSEA - SYD
1 stop22h 55mAir Canada
Tue 2/1011:20 amSYD - SEA
1 stop22h 11mAir Canada
Deal found 12/31$1,230
This United Airlines deal was found by Cheapflights users on 12/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:45 pmPDX - SYD
1 stop18h 30mUnited Airlines
Tue 1/62:00 pmSYD - PDX
1 stop19h 55mUnited Airlines
Deal found 12/31$1,272
This oojo deal was found by Cheapflights users on 12/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/303:49 pmSEA - MEL
2 stops44h 21mCathay Pacific
Mon 2/23:35 pmMEL - SEA
2 stops41h 43mCathay Pacific
Deal found 12/30$1,319
This oojo deal was found by Cheapflights users on 12/31. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:49 pmSEA - SYD
2 stops44h 26mCathay Pacific
Tue 2/1011:05 amSYD - SEA
2 stops41h 56mCathay Pacific
Deal found 12/31$1,343
This Expedia deal was found by Cheapflights users on 12/30. 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.
Wed 12/318:00 pmSEA - SYD
1 stop18h 35mMultiple Airlines
Tue 1/65:50 pmSYD - SEA
2 stops34h 25mMultiple Airlines
Deal found 12/30$1,527
This Expedia deal was found by Cheapflights users on 12/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:00 pmSEA - SYD
2 stops24h 15mMultiple Airlines
Mon 1/57:15 pmSYD - SEA
2 stops33h 00mMultiple Airlines
Deal found 12/29$1,542
This United Airlines deal was found by Cheapflights users on 12/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:57 amSEA - SYD
2 stops27h 03mUnited Airlines
Tue 1/611:20 amSYD - SEA
2 stops26h 06mUnited Airlines
Deal found 12/30$1,559
This Delta deal was found by Cheapflights users on 12/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:45 amSEA - SYD
1 stop24h 05mDelta
Mon 1/510:40 amSYD - SEA
1 stop25h 18mDelta
Deal found 12/29$1,703
This United Airlines deal was found by Cheapflights users on 12/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:12 pmSEA - SYD
1 stop19h 03mUnited Airlines
Tue 1/612:10 pmSYD - SEA
1 stop18h 20mUnited Airlines
Deal found 12/29$1,730

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 January 1, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$767
(lol.travel)

One-way from

$377
(SmartFares)

Popular in

December

Cheapest in

August

Average price

$1,332
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. 15% potential increase in price ($194 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 1, 2026.
Use the filters below to find and compare flights from Washington to Australia that are best for you.

Fly from

Washington

Fly to

Australia

Route

Depart

Return

Price

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Fri 2/13

3:15 pm-8:45 am

1 stop23h 30m

Brisbane

Fri 2/20

10:45 am-9:15 am

1 stop16h 30m

$797

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 3/5

3:15 pm-8:45 am

1 stop23h 30m

Brisbane

Thu 3/19

9:45 am-2:40 pm

1 stop21h 55m

$797

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Tue 1/20

7:00 pm-8:45 am

1 stop19h 45m

Brisbane

Sat 1/31

10:45 am-6:30 pm

1 stop25h 45m

$835

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 3/4

9:50 am-8:45 am

1 stop28h 55m

Brisbane

Wed 3/11

9:45 am-6:30 pm

1 stop25h 45m

$836

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sun 2/8

3:15 pm-8:45 am

1 stop23h 30m

Brisbane

Thu 2/12

10:45 am-2:40 pm

1 stop21h 55m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 1/26

12:25 pm-7:30 am

2 stops25h 05m

Brisbane

Fri 2/6

11:40 am-12:59 am

1 stop31h 19m

$860

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Thu 3/5

7:49 pm-7:30 am

1 stop17h 41m

Brisbane

Wed 3/11

10:40 am-12:33 pm

1 stop18h 53m

$870

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sat 3/7

3:45 pm-7:30 am

1 stop21h 45m

Brisbane

Tue 3/10

10:40 am-12:33 pm

1 stop18h 53m

$870

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 3/2

7:57 pm-7:30 am

1 stop17h 33m

Brisbane

Tue 3/10

10:40 am-12:33 pm

1 stop18h 53m

$870

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 2/25

1:40 pm-7:30 am

1 stop23h 50m

Brisbane

Wed 3/11

10:40 am-12:33 pm

1 stop18h 53m

$870

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/31

Showing 1-10 of 60 results
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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, July is the cheapest month in which you can book a flight from State of Washington to Australia (average of $518). Flying from State of Washington to Australia in December is currently the most expensive (average of $851). 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 22h 04m. Air Canada provides one of the quickest options available for as low as $954. There are 8111 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, July is the cheapest month in which you can book a flight from State of Washington to Australia (average of $518). Flying from State of Washington to Australia in December is currently the most expensive (average of $851). 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

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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 January 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,406FlexibilityNo cancel feeOn-time75%
ANACheapest$583Average$615FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$647Average$1,273FlexibilityNo cancel feeOn-time74%
Philippine AirlinesCheapest$758Average$880FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$779Average$1,097FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$804Average$976FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$812Average$1,162FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$830Average$1,275FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,222FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,265Average$1,490FlexibilityNo cancel feeOn-time81%

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