The cheapest times to fly from SEA to DUT are

  • January 22nd to February 18th
  • August 13th to December 9th

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 SEA to DUT is late September. Prices can be as high as $1689 for Wednesday flights during mid July, or as low as $1209 for Thursday flights around late September.


When to Fly to Unalaska

Flying from Seattle, WA (SEA) to Unalaska, AK (DUT) will usually cost between $1209 to $1361 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late September with an average ticket price of $1219. Due to high demand the most expensive time to fly is mid July, with an average price of $1384. Planning your trip to low-cost times can easily save you $165 on economy flights and even more on first-class flights. Generally, any price below $1242 can be considered a good price for a round-trip SEA to DUT flight.

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

SEA to DUT Flight Prices

Compared to other flights, the SEA to DUT flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.4, which is a bit above average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to depart and return on this flight. Wednesdays 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 $23 (2%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $1249. Return trip prices are from the DUT to SEA 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 SEA to DUT can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 4 hour 30 minutes may not be realistic.


Flight Questions Answered

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

Which airlines fly this route?

You can find 4 major airlines flying this route most often: Alaska, American, Delta, United, and potentially more during busy seasons.

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

The distance between the two airports is roughly 1953 miles or 3143 kilometers.

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

The real-world flight time for a nonstop SEA to DUT flight is about 4 hour 30 minutes.

How many flights go between Seattle, WA and Unalaska, AK?

It depends on the day of the week and the date, but a typical day might have around 37 available flights from SEA to DUT.


Airport Location Info


Departing Airport

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

Return Airport

Destination code DUT
Destination airport name Unalaska Airport
City Unalaska, AK
Country the United States
Latitude 53.9
Longitude -166.5


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.