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$401+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Dec 31 — Jan 71
Wed 12/31
Wed 1/7
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 December 1, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$786
(Priceline)

One-way from

$401
(Mytrip)

Popular in

December

Cheapest in

August

Average price

$1,395
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. 2% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in December 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 December 1, 2025.

This Air Canada deal was found by Cheapflights users on 11/28. 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.
Mon 12/17:00 pmPDX - BNE
1 stop19h 45mAir Canada
Mon 12/2210:45 amBNE - PDX
1 stop16h 30mAir Canada
Deal found 11/28$791
This Priceline deal was found by Cheapflights users on 11/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/293:40 pmSEA - BNE
1 stop23h 05mAir Canada
Sat 12/610:45 amBNE - SEA
1 stop21h 46mAir Canada
Deal found 11/28$809
This Air Canada deal was found by Cheapflights users on 11/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/293:15 pmPDX - BNE
1 stop23h 30mAir Canada
Sat 12/610:45 amBNE - PDX
1 stop21h 55mAir Canada
Deal found 11/29$829
This FlightHub deal was found by Cheapflights users on 11/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/298:00 pmSEA - BNE
2 stops25h 30mMultiple Airlines
Sat 12/610:45 amBNE - SEA
1 stop21h 46mMultiple Airlines
Deal found 11/28$847
This FlightHub deal was found by Cheapflights users on 11/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/297:00 pmPDX - BNE
2 stops27h 30mMultiple Airlines
Sat 12/610:45 amBNE - PDX
1 stop21h 55mMultiple Airlines
Deal found 11/29$848
This American Airlines deal was found by Cheapflights users on 11/28. 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.
Mon 12/18:35 amPDX - BNE
2 stops26h 25mAmerican Airlines
Mon 12/227:40 pmBNE - PDX
1 stop19h 44mAmerican Airlines
Deal found 11/28$849
This United Airlines deal was found by Cheapflights users on 11/29. 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.
Wed 12/101:05 pmSEA - BNE
1 stop24h 25mUnited Airlines
Wed 12/1711:40 amBNE - SEA
1 stop24h 48mUnited Airlines
Deal found 11/29$867
This United Airlines deal was found by Cheapflights users on 11/30. 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.
Mon 12/155:00 amPDX - BNE
2 stops32h 30mUnited Airlines
Wed 12/2411:40 amBNE - PDX
1 stop21h 06mUnited Airlines
Deal found 11/30$871
This United Airlines deal was found by Cheapflights users on 11/30. 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.
Fri 12/1211:59 pmPDX - BNE
2 stops37h 31mUnited Airlines
Tue 12/3011:40 amBNE - PDX
2 stops40h 21mUnited Airlines
Deal found 11/30$885
This Cheapflightsfares deal was found by Cheapflights users on 11/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/14:30 pmPDX - MEL
1 stop22h 00mQantas Airways
Sun 12/712:00 pmMEL - PDX
1 stop24h 28mQantas Airways
Deal found 11/29$932
This Qantas Airways deal was found by Cheapflights users on 11/29. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/25:59 pmPDX - MEL
1 stop20h 31mMultiple Airlines
Thu 12/412:00 pmMEL - PDX
1 stop24h 28mMultiple Airlines
Deal found 11/29$950
This Qantas Airways deal was found by Cheapflights users on 11/30. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/55:59 pmPDX - MEL
1 stop20h 31mMultiple Airlines
Fri 12/1212:00 pmMEL - PDX
1 stop24h 28mMultiple Airlines
Deal found 11/30$951

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 December 1, 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 2/12

3:40 pm-8:45 am

1 stop23h 05m

Brisbane

Sun 2/22

10:45 am-9:31 am

1 stop16h 46m

$791

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 2/8

8:00 pm-8:45 am

1 stop18h 45m

Brisbane

Sun 2/22

6:10 am-9:31 am

2 stops21h 21m

$809

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 3/23

7:00 pm-11:30 am

2 stops23h 30m

Brisbane

Fri 4/17

10:00 am-2:40 pm

1 stop21h 40m

$810

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sun 2/15

9:50 am-8:45 am

1 stop28h 55m

Brisbane

Tue 3/3

10:45 am-9:15 am

1 stop16h 30m

$852

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 3/13

7:32 pm-6:30 am

1 stop17h 58m

Brisbane

Fri 3/27

10:40 am-10:59 pm

2 stops29h 19m

$859

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Fri 2/20

11:17 am-8:20 am

1 stop27h 03m

Brisbane

Sun 3/1

10:40 am-12:58 pm

1 stop20h 18m

$866

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Mon 1/26

3:50 pm-7:30 am

1 stop21h 40m

Brisbane

Fri 2/6

11:40 am-12:33 pm

1 stop18h 53m

$867

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Sun 2/15

7:57 pm-7:30 am

1 stop17h 33m

Brisbane

Mon 3/2

11:40 am-2:48 pm

1 stop21h 08m

$867

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Fri 2/13

1:40 pm-7:30 am

1 stop23h 50m

Brisbane

Mon 3/2

11:40 am-6:55 pm

1 stop25h 15m

$867

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Tue 2/24

3:50 pm-7:30 am

1 stop21h 40m

Brisbane

Tue 3/24

10:40 am-6:48 pm

1 stop25h 08m

$867

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/28

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 December 1, 2025.

It’s typically best to fly out from State of Washington to Australia in the morning. 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 17h 58m. Air Canada provides one of the quickest options available for as low as $859. 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 $403 on Air Canada. Other airlines that offer cheap prices include American Airlines from $434 and United Airlines from $451 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 December 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$583Average$615FlexibilityNo cancel feeOn-time80%
Alaska AirlinesCheapest$591Average$1,402FlexibilityNo cancel feeOn-time75%
Philippine AirlinesCheapest$758Average$921FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$779Average$1,107FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$789Average$1,272FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$976FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$1,155FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$831Average$1,284FlexibilityNo cancel feeOn-time69%
DeltaCheapest$842Average$1,204FlexibilityNo cancel feeOn-timeN/A
Singapore AirlinesCheapest$1,239Average$1,483FlexibilityNo cancel feeOn-time81%

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