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Cheap flights from Washington to Adelaide from $770

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ADL
6 Aug — 13 Aug1
1 adult

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 1 August 2025.

Round-trip from

$1,612

One-way from

$770

Popular in

January

Cheapest in

November

Average price

$1,934
27/8-3/9
  • 27/8-3/9
  • 4 total stops
  • 67h 42m total
  • Washington to Adelaide
Search Deals
Qantas Airways
  • Qantas Airways
  • 7/9
  • 2 total stops
  • 26h 27m total
  • Washington to Adelaide
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($854 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($172 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find 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 1 August 2025.

Wed 27/819:15SEA - ADL
2 stops34h 20mMultiple Airlines
Wed 3/916:30ADL - SEA
2 stops33h 22mMultiple Airlines
Deal found 29/7$1,612
Thu 28/817:59SEA - ADL
2 stops25h 36mQantas Airways
Thu 4/912:45ADL - SEA
2 stops25h 21mQantas Airways
Deal found 30/7$1,620
Wed 1/1017:26SEA - ADL
2 stops24h 09mUnited Airlines
Fri 31/1006:00ADL - SEA
3 stops32h 21mUnited Airlines
Deal found 30/7$2,406
Wed 27/816:30SEA - ADL
1 stop30h 50mQatar Airways
Wed 3/918:20ADL - SEA
2 stops34h 55mQatar Airways
Deal found 29/7$2,510
Thu 28/819:05SEA - ADL
2 stops24h 00mFiji Airways
Thu 4/912:35ADL - SEA
3 stops51h 14mFiji Airways
Deal found 30/7$2,716

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 1 August 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

Wed 27/8

19:15-22:05

2 stops34h 20m

Adelaide

Wed 3/9

16:30-09:22

2 stops33h 22m

$1,612

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 28/8

17:59-12:05

2 stops25h 36m

Adelaide

Thu 4/9

12:45-21:36

2 stops25h 21m

$1,620

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 1/10

17:26-10:05

2 stops24h 09m

Adelaide

Fri 31/10

06:00-20:51

3 stops32h 21m

$2,406

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 27/8

16:30-15:50

1 stop30h 50m

Adelaide

Wed 3/9

18:20-12:45

2 stops34h 55m

$2,510

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Thu 28/8

19:05-11:35

2 stops24h 00m

Adelaide

Thu 4/9

12:35-23:19

3 stops51h 14m

$2,716

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 7/9

15:23-10:20

2 stops26h 27m

$770

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 7/9

14:15-07:55

3 stops49h 10m

$944

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 7/9

10:15-07:25

1 stop28h 40m

$1,765

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 27/8

16:30-15:50

1 stop30h 50m

$2,039

Flights are sorted by cheapest return flights first.

Deals found on 29/7

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.

Reviews of airlines servicing Adelaide

Get insights into the airlines that provide service to Adelaide. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Adelaide. Reviews last updated 1 August 2025.
Read reviews from past customers who have flown with Singapore Airlines, Fiji Airways, andQantas Airways from Washington to Adelaide. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very Good
1,338 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

7.9

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.
Singapore Airlines
8.1
Very Good
1,338 reviews
Singapore Airlines
8.1
Very Good
1,338 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

7.9

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.
Fiji Airways
8.0
Very Good
202 reviews
Singapore Airlines
8.1
Very Good
1,338 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

7.9

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.
Qantas Airways
7.5
Good
887 reviews
Singapore Airlines
8.1
Very Good
1,338 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

7.9

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.
Qatar Airways
7.4
Good
3,609 reviews
Singapore Airlines
8.1
Very Good
1,338 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

7.9

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.
United Airlines
7.4
Good
8,900 reviews
Singapore Airlines
8.1
Very Good
1,338 reviews
Check prices

Crew

8.6

Food

7.7

Boarding

8.2

Comfort

7.9

Entertainment

8.0

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

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.

  • What are the cheapest airlines to fly from State of Washington to Adelaide one-way?

    For one-way options, check prices for Qantas Airways. According to our data, you can fly for as low as $770. Users have also found prices from $1,765 and $2,039 on Singapore Airlines and Qatar Airways, respectively.

  • 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.

  • What is the cheapest month to book a flight from State of Washington to Adelaide?

    Currently, June is the cheapest month in which you can book a flight from State of Washington to Adelaide (average of $168). Flying from State of Washington to Adelaide in October is currently the most expensive (average of $241). 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

Travelling to a place near Adelaide?

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

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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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