The cheapest times to fly from ADL to SEA are

  • January 22nd to March 18th (except the week of February 5th)
  • April 23rd to June 17th
  • October 8th to November 18th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from ADL to SEA is late October. Prices can be as high as $2104 for Saturday flights during early to mid December, or as low as $804 for Tuesday flights around late October.


When to Fly to Seattle

Flying from Adelaide (ADL) to Seattle, WA (SEA) will usually cost between $811 to $1607 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late October with an average ticket price of $837. Due to high demand the most expensive time to fly is early to mid December, with an average price of $1724. Planning your trip to low-cost times can easily save you $888 on economy flights and even more on first-class flights. Generally, any price below $994 can be considered a good price for a round-trip ADL to SEA flight.

See below for a graph of average weekly prices for the ADL to SEA route. All prices are for round-trip tickets in USD.

ADL to SEA Flight Prices

Compared to other flights, the ADL to SEA flight is priced close to the average and costs about as much as the average flight leaving from Adelaide. The average price per mile (for a direct flight) is $0.07, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to SEA, and Wednesday the cheapest day to fly back into ADL. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $143 (9%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $987. Return trip prices are from the SEA to ADL flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from ADL to SEA can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 15 hour 59 minutes may not be realistic.


Flight Questions Answered

Still have questions about flying from ADL to SEA? We’ve got answers.

Which airlines fly this route?

You can find 22 major airlines flying this route most often: Air Canada, Air France, Air New Zealand, Alaska, American, ANA, Asiana, Cathay Pacific, China Eastern, China Southern, Delta, Emirates, Etihad, EVA Air, Fiji Airways, Hawaiian, Qantas, Qatar Airways, Singapore Airlines, United, Virgin Atlantic, Virgin Australia, and potentially more during busy seasons.

How far away is it from Seattle/Tacoma International Airport to Adelaide International Airport?

The distance between the two airports is roughly 8336 miles or 13415 kilometers.

How long does it take to fly from ADL to SEA?

The real-world flight time for a nonstop ADL to SEA flight is about 15 hour 59 minutes.

How many flights go between Adelaide and Seattle, WA?

It depends on the day of the week and the date, but a typical day might have around 61 available flights from ADL to SEA.


Airport Location Info


Departing Airport

Origination code ADL
Origination airport name Adelaide International Airport
City Adelaide
Country Australia
Latitude -34.9
Longitude 138.5

Return Airport

Destination code SEA
Destination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.