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$520+ 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 11/26. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SYD
Aug 29 — Sep 51
Sat 8/29
Sat 9/5
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 July 30, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Wed 11/182:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$957
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/911:06 am
SEA
-
BNE
1 stop24h 44m
Multiple Airlines
Wed 11/1811:25 am
BNE
-
SEA
2 stops25h 01m
Multiple Airlines
Deal found 7/30$957
This Kiwi.com deal was found by Cheapflights users on 7/29. 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.
Wed 10/2811:06 am
SEA
-
SYD
1 stop25h 19m
Multiple Airlines
Tue 11/172:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/29$961
This Kiwi.com deal was found by Cheapflights users on 7/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Mon 11/162:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$962
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/210:34 am
SEA
-
SYD
1 stop27h 56m
Multiple Airlines
Tue 10/272:00 pm
SYD
-
SEA
2 stops22h 26m
Multiple Airlines
Deal found 7/30$965
This Kiwi.com deal was found by Cheapflights users on 7/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Tue 11/172:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$968
This Kiwi.com deal was found by Cheapflights users on 7/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/311:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Mon 11/162:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$971
This Kiwi.com deal was found by Cheapflights users on 7/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/311:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Tue 11/172:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$977
This Kiwi.com deal was found by Cheapflights users on 7/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/311:06 am
SEA
-
SYD
1 stop24h 19m
Multiple Airlines
Wed 11/182:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/26$979
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:15 pm
SEA
-
SYD
1 stop42h 15m
Multiple Airlines
Tue 11/32:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/30$981
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/218:15 pm
SEA
-
SYD
1 stop42h 15m
Multiple Airlines
Thu 11/52:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/30$983
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/610:34 am
SEA
-
SYD
1 stop27h 56m
Multiple Airlines
Wed 11/182:00 pm
SYD
-
SEA
2 stops23h 26m
Multiple Airlines
Deal found 7/30$984

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 July 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$957
(Kiwi.com)

One-way from

$520
(Jetabroad)

Popular in

December

Cheapest in

August

Average price

$1,298
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. 17% potential increase in price ($239 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 30, 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

Tue 10/20

10:10 am-7:05 am

1 stop27h 55m

Brisbane

Tue 11/3

10:45 am-9:26 am

1 stop16h 41m

$1,025

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 8/18

1:25 pm-7:50 am

2 stops49h 25m

Melbourne

Fri 8/28

10:00 am-12:27 pm

1 stop19h 27m

$1,054

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 9/9

9:59 am-7:50 am

1 stop28h 51m

Melbourne

Wed 9/16

10:00 am-2:53 pm

1 stop21h 53m

$1,060

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 8/23

1:16 pm-8:15 am

1 stop25h 59m

Melbourne

Sun 8/30

9:30 am-9:15 pm

2 stops28h 45m

$1,065

PortlandBrisbane

PDX - BNE

PDXBNE

Portland

Wed 8/12

12:45 pm-6:30 am

2 stops24h 45m

Brisbane

Wed 8/26

10:30 am-5:49 pm

2 stops24h 19m

$1,069

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 11/1

1:30 pm-8:30 am

2 stops49h 00m

Brisbane

Wed 11/11

10:40 am-4:52 pm

2 stops24h 12m

$1,080

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 9/7

5:22 pm-7:05 am

1 stop20h 43m

Sydney Kingsford Smith

Sun 9/20

9:25 pm-11:10 pm

1 stop18h 45m

$1,084

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 9/7

3:30 pm-6:55 am

1 stop22h 25m

Sydney Kingsford Smith

Sun 9/20

9:30 am-9:15 pm

2 stops28h 45m

$1,089

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 9/17

12:55 pm-6:45 am

1 stop24h 50m

Melbourne

Wed 9/23

9:45 am-12:25 pm

1 stop19h 40m

$1,092
Quickest round-trip

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 8/26

6:52 pm-7:30 am

1 stop19h 38m

Melbourne

Wed 9/2

9:30 am-11:34 am

1 stop19h 04m

$1,093

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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, February is the cheapest month in which you can book a flight from State of Washington to Australia (average of $970). Flying from State of Washington to Australia in December is currently the most expensive (average of $1,668). 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 90 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 25h 59m. Air Canada provides one of the quickest options available for as low as $1,065. 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 $366 on Air Canada. Other airlines that offer cheap prices include Qantas Airways from $380 and Philippine Airlines from $394 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, February is the cheapest month in which you can book a flight from State of Washington to Australia (average of $970). Flying from State of Washington to Australia in December is currently the most expensive (average of $1,668). 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 July 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$97Average$1,495FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$385Average$1,099FlexibilityNo cancel feeOn-time67%
ANACheapest$583Average$632FlexibilityNo cancel feeOn-time80%
United AirlinesCheapest$598Average$1,246FlexibilityNo cancel feeOn-time69%
Qantas AirwaysCheapest$803Average$1,297FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$804Average$1,126FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$813Average$899FlexibilityNo cancel feeOn-time85%
DeltaCheapest$842Average$1,401FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$947Average$1,470FlexibilityNo cancel feeOn-time78%
Cathay PacificCheapest$1,153Average$1,271FlexibilityNo cancel feeOn-time72%

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