$872 Cheap Flights from Unalaska (DUT) to Seattle (SEA)

View $872 flight on Thu, Aug 21, 2025Opens in a new window

Popular airlines from Unalaska, AK (DUT) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Unalaska to Seattle (DUT-SEA)

Prices were available within the past 7 days and start at $872 for one-way flights and $1,707 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sterling-Aleutian Airways
Thu, Aug 21 - Thu, Sep 11
DUT
Unalaska
SEA
Seattle
$1,707 Roundtrip, found 1 day ago
$1,707
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Thu, Aug 21 from Unalaska to Seattle, returning Thu, Sep 11, priced at $1,707 found 1 day ago
Sterling-Aleutian Airways
Wed, Aug 20 - Sat, Aug 30
DUT
Unalaska
SEA
Seattle
$1,723 Roundtrip, found 1 day ago
$1,723
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Wed, Aug 20 from Unalaska to Seattle, returning Sat, Aug 30, priced at $1,723 found 1 day ago
Sterling-Aleutian Airways
Fri, Aug 15 - Fri, Aug 29
DUT
Unalaska
SEA
Seattle
$1,727 Roundtrip, found 1 day ago
$1,727
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Fri, Aug 15 from Unalaska to Seattle, returning Fri, Aug 29, priced at $1,727 found 1 day ago
Sterling-Aleutian Airways
Fri, Aug 22 - Thu, Sep 11
DUT
Unalaska
SEA
Seattle
$1,736 Roundtrip, found 1 day ago
$1,736
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Fri, Aug 22 from Unalaska to Seattle, returning Thu, Sep 11, priced at $1,736 found 1 day ago
Sterling-Aleutian Airways
Fri, Aug 15 - Sat, Aug 30
DUT
Unalaska
SEA
Seattle
$1,743 Roundtrip, found 1 day ago
$1,743
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Fri, Aug 15 from Unalaska to Seattle, returning Sat, Aug 30, priced at $1,743 found 1 day ago
Sterling-Aleutian Airways
Tue, Aug 12 - Fri, Aug 22
DUT
Unalaska
SEA
Seattle
$1,756 Roundtrip, found 1 day ago
$1,756
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Tue, Aug 12 from Unalaska to Seattle, returning Fri, Aug 22, priced at $1,756 found 1 day ago
Sterling-Aleutian Airways
Thu, Aug 14 - Fri, Aug 29
DUT
Unalaska
SEA
Seattle
$1,756 Roundtrip, found 1 day ago
$1,756
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Thu, Aug 14 from Unalaska to Seattle, returning Fri, Aug 29, priced at $1,756 found 1 day ago
Sterling-Aleutian Airways
Tue, Aug 5 - Thu, Aug 21
DUT
Unalaska
SEA
Seattle
$1,759 Roundtrip, found 1 day ago
$1,759
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Tue, Aug 5 from Unalaska to Seattle, returning Thu, Aug 21, priced at $1,759 found 1 day ago
Sterling-Aleutian Airways
Thu, Aug 14 - Sat, Aug 30
DUT
Unalaska
SEA
Seattle
$1,772 Roundtrip, found 1 day ago
$1,772
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Thu, Aug 14 from Unalaska to Seattle, returning Sat, Aug 30, priced at $1,772 found 1 day ago
Sterling-Aleutian Airways
Tue, Aug 5 - Mon, Aug 18
DUT
Unalaska
SEA
Seattle
$1,779 Roundtrip, found 1 day ago
$1,779
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Tue, Aug 5 from Unalaska to Seattle, returning Mon, Aug 18, priced at $1,779 found 1 day ago
Flights from Unalaska (DUT) to Seattle (SEA)
Origin airport
Unalaska
Destination airport
Seattle - Tacoma Intl.
Roundtrip price
$1,707
Distance
1953 mi

Unalaska to Seattle Flights

The cheapest times to fly from Unalaska to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Unalaska to Seattle are during the month of August. You can find some of the cheapest flights from Unalaska to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Unalaska to Seattle

Sunday is one of the best days to book for cheap flights from Unalaska to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Unalaska to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Unalaska to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $872 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Unalaska to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Unalaska to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA) cost?
Discover the latest flight deals from DUT to SEA by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from DUT to SEA?
The cheapest flights from DUT to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from DUT to SEA?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from DUT to SEA. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA)?
Direct flights from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from DUT to SEA?
Usually you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* But this can vary based on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA)?
To avoid possible delays on the Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA) route, aim to travel before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Last-minute bookings from DUT to SEA are typically more expensive. For the lowest prices, start searching for flights as early as possible. That being said, if your travel plans are flexible, you may score a cheap ticket right before you leave.
Is it cheaper to book a DUT to SEA flight and hotel package?
You'll typically save money by securing a DUT to SEA flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've selected your preferred accommodations and flights, consider other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA)?
Typically, you can reschedule or cancel your DUT to SEA flight. However, additional charges may apply, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you want more information, go to our Customer Service portal.

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*Available to One Key members.