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

View $872 flight on Fri, Sep 26, 2025Opens in a new window

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

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 $1,824 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sterling-Aleutian Airways
Tue, Sep 2 - Tue, Sep 9
DUT
Unalaska
SEA
Seattle
$1,824 Roundtrip, found 5 days ago
$1,824
Roundtrip
found 5 days ago
Select Sterling-Aleutian Airways flight, departing Tue, Sep 2 from Unalaska to Seattle, returning Tue, Sep 9, priced at $1,824 found 5 days ago
Sterling-Aleutian Airways
Wed, Sep 10 - Thu, Sep 11
DUT
Unalaska
SEA
Seattle
$1,840 Roundtrip, found 1 day ago
$1,840
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Wed, Sep 10 from Unalaska to Seattle, returning Thu, Sep 11, priced at $1,840 found 1 day ago
Sterling-Aleutian Airways
Tue, Sep 2 - Mon, Sep 8
DUT
Unalaska
SEA
Seattle
$1,840 Roundtrip, found 5 days ago
$1,840
Roundtrip
found 5 days ago
Select Sterling-Aleutian Airways flight, departing Tue, Sep 2 from Unalaska to Seattle, returning Mon, Sep 8, priced at $1,840 found 5 days ago
Sterling-Aleutian Airways
Wed, Sep 10 - Thu, Sep 11
DUT
Unalaska
SEA
Seattle
$1,845 Roundtrip, found 1 day ago
$1,845
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Wed, Sep 10 from Unalaska to Seattle, returning Thu, Sep 11, priced at $1,845 found 1 day ago
Sterling-Aleutian Airways
Mon, Sep 1 - Tue, Sep 9
DUT
Unalaska
SEA
Seattle
$1,853 Roundtrip, found 5 days ago
$1,853
Roundtrip
found 5 days ago
Select Sterling-Aleutian Airways flight, departing Mon, Sep 1 from Unalaska to Seattle, returning Tue, Sep 9, priced at $1,853 found 5 days ago
Sterling-Aleutian Airways
Sun, Aug 31 - Tue, Sep 9
DUT
Unalaska
SEA
Seattle
$1,861 Roundtrip, found 5 days ago
$1,861
Roundtrip
found 5 days ago
Select Sterling-Aleutian Airways flight, departing Sun, Aug 31 from Unalaska to Seattle, returning Tue, Sep 9, priced at $1,861 found 5 days ago
Sterling-Aleutian Airways
Sun, Aug 31 - Mon, Sep 8
DUT
Unalaska
SEA
Seattle
$1,866 Roundtrip, found 5 days ago
$1,866
Roundtrip
found 5 days ago
Select Sterling-Aleutian Airways flight, departing Sun, Aug 31 from Unalaska to Seattle, returning Mon, Sep 8, priced at $1,866 found 5 days ago
Sterling-Aleutian Airways
Thu, Aug 28 - Mon, Sep 8
DUT
Unalaska
SEA
Seattle
$1,869 Roundtrip, found 5 days ago
$1,869
Roundtrip
found 5 days ago
Select Sterling-Aleutian Airways flight, departing Thu, Aug 28 from Unalaska to Seattle, returning Mon, Sep 8, priced at $1,869 found 5 days ago
Sterling-Aleutian Airways
Tue, Sep 2 - Sun, Sep 7
DUT
Unalaska
SEA
Seattle
$1,870 Roundtrip, found 5 days ago
$1,870
Roundtrip
found 5 days ago
Select Sterling-Aleutian Airways flight, departing Tue, Sep 2 from Unalaska to Seattle, returning Sun, Sep 7, priced at $1,870 found 5 days ago
Sterling-Aleutian Airways
Wed, Sep 10 - Thu, Sep 11
DUT
Unalaska
SEA
Seattle
$1,890 Roundtrip, found 1 day ago
$1,890
Roundtrip
found 1 day ago
Select Sterling-Aleutian Airways flight, departing Wed, Sep 10 from Unalaska to Seattle, returning Thu, Sep 11, priced at $1,890 found 1 day ago
Flights from Unalaska (DUT) to Seattle (SEA)
Origin airport
Unalaska
Destination airport
Seattle - Tacoma Intl.
Roundtrip price
$1,824
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 September. 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?
Get a cheap one-way flight from $872 or cheap return flight from $1,824 from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from DUT to SEA is September, when demand is low. Off-peak season is often when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Unalaska Airport (DUT) to Seattle - Tacoma Intl. Airport (SEA)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll take you from DUT to SEA. Then, sort your results by "Price (lowest to highest)" to snag 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.