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Cheap flights from Washington to Adelaide from $929

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ADL
4 Dec — 11 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Washington to Adelaide

Enter your travel dates to find the best prices.

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 4 November 2025.

Thu 25/1213:55SEA - ADL
2 stops25h 05mUnited Airlines
Sat 3/114:55ADL - SEA
1 stop24h 42mUnited Airlines
Deal found 3/11$2,532
Mon 15/1207:00SEA - ADL
2 stops32h 00mUnited Airlines
Mon 22/1214:55ADL - SEA
1 stop20h 27mUnited Airlines
Deal found 2/11$3,198
Sun 14/1200:10SEA - ADL
2 stops35h 35mMultiple Airlines
Mon 22/1206:25ADL - SEA
2 stops30h 15mMultiple Airlines
Deal found 2/11$3,788
Mon 15/1206:05SEA - ADL
3 stops42h 40mCathay Pacific
Mon 22/1207:50ADL - SEA
3 stops43h 42mCathay Pacific
Deal found 2/11$4,222
Mon 15/1211:35SEA - ADL
3 stops54h 10mFiji Airways
Mon 22/1213:15ADL - SEA
2 stops23h 58mFiji Airways
Deal found 2/11$4,367
Mon 15/1216:05SEA - ADL
1 stop30h 30mQatar Airways
Mon 22/1222:00ADL - SEA
1 stop32h 10mQatar Airways
Deal found 2/11$4,419
Thu 25/1209:05SEA - ADL
3 stops32h 40mFiji Airways
Sat 3/113:15ADL - SEA
2 stops23h 58mFiji Airways
Deal found 3/11$4,966
Thu 25/1209:25SEA - ADL
3 stops32h 20mMultiple Airlines
Sat 3/106:35ADL - SEA
3 stops30h 05mMultiple Airlines
Deal found 3/11$5,540

Cheap flight deals from Washington to Adelaide

Keep the following information in mind while searching for Washington to Adelaide flight deals. Data was last updated 4 November 2025.

Round-trip from

$1,585

One-way from

$929

Popular in

January

Cheapest in

September

Average price

$1,662
Air Canada
  • Air Canada
  • 12/2-21/2
  • 4 total stops
  • 58h 16m total
  • Washington to Adelaide
Search Deals
10/2
  • 10/2
  • 2 total stops
  • 25h 48m total
  • Washington to Adelaide
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($639 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($202 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 4 November 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 15/3

10:05-13:55

2 stops34h 20m

Adelaide

Thu 19/3

06:10-19:16

2 stops30h 36m

$1,808

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 12/2

12:37-09:30

1 stop26h 23m

Adelaide

Sat 21/2

14:55-18:27

1 stop22h 02m

$1,852

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Tue 20/1

09:00-10:55

2 stops31h 25m

Adelaide

Sat 14/2

17:10-11:25

2 stops36h 45m

$2,092

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 19/1

00:10-06:15

2 stops35h 35m

Adelaide

Sat 14/2

06:15-19:16

3 stops31h 31m

$2,407

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 15/3

09:45-08:50

1 stop29h 35m

Adelaide

Thu 19/3

18:35-08:10

1 stop31h 05m

$2,802

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 25/12

05:02-09:30

2 stops33h 58m

Adelaide

Sat 3/1

06:10-08:23

2 stops44h 43m

$2,926

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 9/11

00:10-14:05

3 stops43h 25m

$1,024

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 10/11

00:10-07:25

2 stops36h 45m

$1,039

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Tue 10/2

15:45-11:15

3 stops25h 00m

$1,041

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 12/11

23:45-20:35

3 stops50h 20m

$1,054

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 16 results
1
2

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 return 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
No data available for this route at this time. Please check back soon.

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?

    Adelaide (ADL), located 6.6 km from the city centre, is the airport you fly into when you book flights from Washington to Adelaide.

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

    Air Canada, United Airlines, and Air New Zealand can get you from State of Washington to Adelaide in just under 26h 23m. Your travel time can differ by up to 7h 57m. State of Washington and Adelaide are separated by a distance of 13409 km. 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 holiday 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

Travelling to a place near Adelaide?

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

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Can Cheapflights find flights from Washington to Adelaide with no change fees?

Yes, we can. To see specific flights from Washington to Adelaide with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Washington to Adelaide become cheaper?

Yes, Cheapflights offers price alerts on Washington to Adelaide flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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