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$689+ Cheap flights from Washington to Adelaide (ADL)

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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ADL
Jan 25 — Feb 11
Sun 1/25
Sun 2/1
1 adult, Economy
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Cheap flight deals from Washington to Adelaide

Cheapest flights from Washington to Adelaide
Explore the most affordable flight options available from Washington to Adelaide. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 26, 2025.

This FlightHub deal was found by Cheapflights users on 12/24. 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.
Sun 12/284:26 pmPDX - ADL
2 stops26h 44mQantas Airways
Tue 1/137:50 amADL - PDX
2 stops24h 21mQantas Airways
Deal found 12/24$1,303
This United Airlines deal was found by Cheapflights users on 12/24. 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.
Sun 12/287:45 pmPDX - ADL
2 stops23h 40mUnited Airlines
Tue 1/136:00 amADL - PDX
3 stops31h 26mUnited Airlines
Deal found 12/24$1,701
This United Airlines deal was found by Cheapflights users on 12/25. 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 12/257:12 pmSEA - ADL
1 stop19h 48mUnited Airlines
Wed 1/72:55 pmADL - SEA
1 stop24h 47mUnited Airlines
Deal found 12/25$1,789
This United Airlines deal was found by Cheapflights users on 12/25. 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.
Sat 12/2712:35 pmSEA - ADL
1 stop26h 25mUnited Airlines
Mon 1/52:55 pmADL - SEA
1 stop28h 34mUnited Airlines
Deal found 12/25$1,852
This United Airlines deal was found by Cheapflights users on 12/25. 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 12/2511:59 pmSEA - ADL
2 stops63h 01mUnited Airlines
Mon 1/52:55 pmADL - SEA
2 stops37h 29mUnited Airlines
Deal found 12/25$1,882
This United Airlines deal was found by Cheapflights users on 12/25. 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 12/295:54 pmSEA - ADL
1 stop21h 06mUnited Airlines
Thu 1/16:00 amADL - SEA
2 stops31h 15mUnited Airlines
Deal found 12/25$2,113
This United Airlines deal was found by Cheapflights users on 12/25. 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.
Sun 12/287:12 pmSEA - ADL
2 stops24h 28mUnited Airlines
Thu 1/16:00 amADL - SEA
2 stops31h 15mUnited Airlines
Deal found 12/25$2,133
This United Airlines deal was found by Cheapflights users on 12/25. 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.
Sat 12/277:12 pmSEA - ADL
2 stops48h 13mUnited Airlines
Thu 1/16:00 amADL - SEA
2 stops31h 15mUnited Airlines
Deal found 12/25$2,149
This United Airlines deal was found by Cheapflights users on 12/25. 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 12/267:12 pmSEA - ADL
2 stops48h 13mUnited Airlines
Thu 1/16:00 amADL - SEA
2 stops31h 15mUnited Airlines
Deal found 12/25$2,192

Find flight deals from Washington to Adelaide

Keep the following information in mind while searching for Washington to Adelaide flight deals. Data was last updated December 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$947
(Air Canada)

One-way from

$689
(Qantas Airways)

Popular in

January

Cheapest in

September

Average price

$1,274
Provider with most accurate pricing for Seattle/Tacoma Intl-Adelaide flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Adelaide flights.
Search Deals
From Washington to Adelaide
Search Deals
One-way flight from Washington to Adelaide
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($234 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($90 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Adelaide 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 26, 2025.
Use the filters below to find and compare flights from Washington to Adelaide that are best for you.

Fly from

Washington

Fly to

Adelaide

Route

Depart

Return

Price

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 2/8

8:00 pm-1:55 pm

2 stops23h 25m

Adelaide

Sun 2/15

6:10 am-2:31 pm

2 stops26h 51m

$947

PortlandAdelaide

PDX - ADL

PDXADL

Portland

Sun 2/8

7:05 pm-7:10 pm

2 stops29h 35m

Adelaide

Sun 2/15

6:10 am-2:40 pm

2 stops27h 00m

$952

PortlandAdelaide

PDX - ADL

PDXADL

Portland

Mon 2/9

7:05 pm-3:25 pm

2 stops25h 50m

Adelaide

Thu 2/19

6:00 am-9:15 am

2 stops21h 45m

$1,001

PortlandAdelaide

PDX - ADL

PDXADL

Portland

Fri 1/23

7:00 pm-8:45 pm

2 stops31h 15m

Adelaide

Tue 2/17

6:10 am-9:15 am

2 stops21h 35m

$1,055

PortlandAdelaide

PDX - ADL

PDXADL

Portland

Thu 2/19

9:50 am-1:55 pm

2 stops33h 35m

Adelaide

Mon 2/23

6:10 am-9:15 am

2 stops21h 35m

$1,084

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sat 2/21

8:00 pm-7:10 pm

2 stops28h 40m

Adelaide

Tue 2/24

7:55 pm-2:31 pm

2 stops37h 06m

$1,088

PortlandAdelaide

PDX - ADL

PDXADL

Portland

Mon 2/9

7:51 pm-9:30 am

1 stop19h 09m

Adelaide

Mon 2/16

2:55 pm-10:59 pm

1 stop26h 34m

$1,114

PortlandAdelaide

PDX - ADL

PDXADL

Portland

Thu 3/5

9:50 am-1:55 pm

2 stops33h 35m

Adelaide

Mon 3/9

7:55 pm-2:40 pm

2 stops36h 15m

$1,164

PortlandAdelaide

PDX - ADL

PDXADL

Portland

Sun 1/11

2:57 pm-3:45 pm

2 stops30h 18m

Adelaide

Sat 1/31

6:05 am-5:52 pm

2 stops30h 17m

$1,362

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Tue 1/13

3:45 pm-10:55 am

2 stops24h 40m

Adelaide

Sat 2/28

7:50 am-6:57 pm

2 stops29h 37m

$1,409

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

Showing 1-10 of 19 results
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Best time to book a flight from Washington to Adelaide

Have a flexible travel schedule? Discover the best time to fly to Adelaide 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 Adelaide

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

Find hourly flight availability from Washington to Adelaide. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 26, 2025.

One of the essential ways to save on airfare from State of Washington to Adelaide is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 34% on airfare.

Related info for your journey

Find useful and relevant information for your journey from Washington to Adelaide. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Adelaide from Washington?

    Located just 4.1 mi from the city center, Adelaide (ADL) is the airport most travelers will use when flying to Adelaide from Washington.

  • How long is the flight from State of Washington to Adelaide?

    For as low as $947, Air Canada can have you in Adelaide from State of Washington in 23h 25m. There are 8332 mi between State of Washington and Adelaide. This flight may include one or multiple stops.

  • Can I find deals for flights from Washington to Adelaide that include hotel bookings?

    Yes. In addition to deals on Washington to Adelaide flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Adelaide?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Adelaide.

  • Can I find deals for business class flights from Washington to Adelaide?

    Yes. Cheapflights offers flight deals from Washington to Adelaide by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Adelaide?

Book flights to Adelaide if you plan to visit one of these locations
Glenelg

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Top airline flying from Washington to Adelaide

Discover the top airline that operate flights from Washington to Adelaide. 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 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,088Average$1,166FlexibilityNo cancel feeOn-time74%

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