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$379+ 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 11/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Dec 17 — Dec 241
Wed 12/17
Wed 12/24
1 adult, Economy
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Cheap flight deals from Washington to Australia

Keep the following information in mind while searching for Washington to Australia flight deals. Data was last updated November 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$771
(Air Canada)

One-way from

$379
(SmartFares)

Popular in

December

Cheapest in

August

Average price

$960
Provider with most accurate pricing for Seattle/Tacoma Intl-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sydney Kingsford Smith flights.
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From Washington to Australia
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One-way flight from Washington to Australia
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Highest demand for flights based on searches. 14% potential increase in price ($174 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find 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 November 17, 2025.

This Air Canada deal was found by Cheapflights users on 11/15. 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 11/298:00 pmSEA - BNE
1 stop18h 45mAir Canada
Tue 12/210:45 amBNE - SEA
1 stop21h 46mAir Canada
Deal found 11/15$779
This lol.travel deal was found by Cheapflights users on 11/15. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/213:40 pmSEA - BNE
1 stop23h 05mAir Canada
Thu 12/410:45 amBNE - SEA
1 stop16h 46mAir Canada
Deal found 11/15$799
This Priceline deal was found by Cheapflights users on 11/16. 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.
Sun 11/3010:05 amSEA - BNE
1 stop28h 40mAir Canada
Wed 12/32:05 pmBNE - SEA
2 stops47h 11mAir Canada
Deal found 11/16$823
This United Airlines deal was found by Cheapflights users on 11/16. 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 12/23:25 pmSEA - BNE
1 stop22h 05mUnited Airlines
Fri 12/1211:40 amBNE - SEA
1 stop24h 52mUnited Airlines
Deal found 11/16$867
This United Airlines deal was found by Cheapflights users on 11/17. 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 12/155:00 amPDX - BNE
2 stops32h 30mUnited Airlines
Wed 12/2411:40 amBNE - PDX
1 stop25h 08mUnited Airlines
Deal found 11/17$872
This United Airlines deal was found by Cheapflights users on 11/16. 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 12/155:00 amSEA - BNE
2 stops32h 30mUnited Airlines
Thu 12/1811:40 amBNE - SEA
1 stop18h 47mUnited Airlines
Deal found 11/16$872
This United Airlines deal was found by Cheapflights users on 11/16. 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.
Thu 11/201:00 pmPDX - BNE
1 stop24h 30mUnited Airlines
Sat 11/2211:40 amBNE - PDX
1 stop24h 56mUnited Airlines
Deal found 11/16$949
This lol.travel deal was found by Cheapflights users on 11/17. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/303:40 pmSEA - SYD
1 stop22h 55mAir Canada
Sun 12/1411:20 amSYD - SEA
1 stop22h 11mAir Canada
Deal found 11/17$959
This American Airlines deal was found by Cheapflights users on 11/17. 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 11/205:42 pmPDX - MEL
1 stop20h 48mAmerican Airlines
Tue 12/21:30 pmMEL - PDX
2 stops22h 42mAmerican Airlines
Deal found 11/17$969
This Air Canada deal was found by Cheapflights users on 11/15. 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 12/87:00 pmPDX - BNE
2 stops24h 25mMultiple Airlines
Mon 12/1510:45 amBNE - PDX
1 stop16h 30mMultiple Airlines
Deal found 11/15$970
This American Airlines deal was found by Cheapflights users on 11/15. 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.
Mon 12/85:30 amPDX - MEL
1 stop28h 30mAmerican Airlines
Tue 12/1612:30 pmMEL - PDX
2 stops23h 58mAmerican Airlines
Deal found 11/15$980
This oojo deal was found by Cheapflights users on 11/15. 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 12/55:41 amPDX - SYD
2 stops54h 54mQantas Airways
Mon 12/2911:20 amSYD - PDX
1 stop24h 51mQantas Airways
Deal found 11/15$981

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 November 17, 2025.
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

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 3/12

5:50 am-7:45 am

1 stop32h 55m

Brisbane

Mon 3/16

9:45 am-10:06 pm

1 stop29h 21m

$853

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 3/13

5:20 pm-6:30 am

1 stop20h 10m

Brisbane

Thu 3/26

10:40 am-4:14 pm

1 stop22h 34m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 3/13

2:00 pm-7:20 am

1 stop24h 20m

Brisbane

Fri 3/27

9:40 am-6:32 pm

2 stops25h 52m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 3/14

5:20 pm-6:30 am

1 stop20h 10m

Brisbane

Wed 3/25

10:40 am-4:14 pm

1 stop22h 34m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 3/16

6:55 pm-7:20 am

1 stop19h 25m

Brisbane

Fri 3/27

9:40 am-12:11 am

2 stops31h 31m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 3/16

7:35 pm-6:30 am

1 stop17h 55m

Brisbane

Sun 3/29

10:30 am-10:54 pm

2 stops29h 24m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 3/13

2:00 pm-7:20 am

1 stop24h 20m

Brisbane

Wed 3/25

10:05 am-6:32 pm

2 stops25h 27m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 3/15

7:32 pm-6:30 am

1 stop17h 58m

Brisbane

Thu 3/26

10:40 am-6:30 pm

1 stop24h 50m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 3/14

12:55 pm-6:30 am

2 stops24h 35m

Brisbane

Sun 3/29

10:30 am-10:38 am

1 stop17h 08m

$858

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 3/17

12:55 pm-6:30 am

2 stops24h 35m

Brisbane

Thu 3/26

10:40 am-11:24 am

1 stop17h 44m

$858

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/15

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 $535). 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.

What is the cheapest time of day to fly from WA to AU?

Find hourly flight availability from Washington to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 17, 2025.

It’s typically best to fly out from State of Washington to Australia in the evening. Doing so could potentially save you 22% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from State of Washington to Australia?

Use this chart to determine the cheapest time to fly round-trip from Washington to Australia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their State of Washington to Australia flight should consider departing on Friday at noon when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 20h 10m. Air Canada provides one of the quickest options available for as low as $858. There are 7346 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 $391 on Air Canada. Other airlines that offer cheap prices include Philippine Airlines from $392 and Qantas Airways from $550 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 $535). 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

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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 November 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$583Average$615FlexibilityNo cancel feeOn-time80%
Alaska AirlinesCheapest$591Average$1,399FlexibilityNo cancel feeOn-time75%
Qantas AirwaysCheapest$647Average$1,274FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$779Average$1,116FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$804Average$1,194FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$820Average$1,143FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$832Average$1,245FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,162FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,239Average$1,483FlexibilityNo cancel feeOn-time81%
Qatar AirwaysCheapest$1,307Average$1,499FlexibilityNo cancel feeOn-time68%

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