$431 Cheap Flights from Seattle (SEA) to Tromsø (TOS)

View $431 flight on Sun, Mar 22, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Tromsø (TOS-Langnes)

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Cheap Flights from Seattle to Tromsø (SEA-TOS)

Prices were available within the past 7 days and start at $431 for one-way flights and $468 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Tue, Oct 7 - Tue, Oct 14
SEA
Seattle
TOS
Tromsø
$468 Roundtrip, found 4 days ago
$468
Roundtrip
found 4 days ago
Select Scandinavian Airlines flight, departing Tue, Oct 7 from Seattle to Tromsø, returning Tue, Oct 14, priced at $468 found 4 days ago
Scandinavian Airlines
Tue, Oct 7 - Tue, Oct 14
SEA
Seattle
TOS
Tromsø
$472 Roundtrip, found 4 days ago
$472
Roundtrip
found 4 days ago
Select Scandinavian Airlines flight, departing Tue, Oct 7 from Seattle to Tromsø, returning Tue, Oct 14, priced at $472 found 4 days ago
Scandinavian Airlines
Wed, Oct 29 - Wed, Nov 5
SEA
Seattle
TOS
Tromsø
$518 Roundtrip, found 2 days ago
$518
Roundtrip
found 2 days ago
Select Scandinavian Airlines flight, departing Wed, Oct 29 from Seattle to Tromsø, returning Wed, Nov 5, priced at $518 found 2 days ago
American Airlines
Tue, Jan 20 - Tue, Jan 27
SEA
Seattle
TOS
Tromsø
$518 Roundtrip, found 4 days ago
$518
Roundtrip
found 4 days ago
Select American Airlines flight, departing Tue, Jan 20 from Seattle to Tromsø, returning Tue, Jan 27, priced at $518 found 4 days ago
American Airlines
Tue, Jan 20 - Tue, Jan 27
SEA
Seattle
TOS
Tromsø
$519 Roundtrip, found 4 days ago
$519
Roundtrip
found 4 days ago
Select American Airlines flight, departing Tue, Jan 20 from Seattle to Tromsø, returning Tue, Jan 27, priced at $519 found 4 days ago
Scandinavian Airlines
Fri, Dec 5 - Fri, Dec 12
SEA
Seattle
TOS
Tromsø
$521 Roundtrip, found 6 days ago
$521
Roundtrip
found 6 days ago
Select Scandinavian Airlines flight, departing Fri, Dec 5 from Seattle to Tromsø, returning Fri, Dec 12, priced at $521 found 6 days ago
Scandinavian Airlines
Fri, Feb 20 - Fri, Feb 27
SEA
Seattle
TOS
Tromsø
$522 Roundtrip, found 3 days ago
$522
Roundtrip
found 3 days ago
Select Scandinavian Airlines flight, departing Fri, Feb 20 from Seattle to Tromsø, returning Fri, Feb 27, priced at $522 found 3 days ago
Delta
Mon, Jan 12 - Tue, Jan 20
SEA
Seattle
TOS
Tromsø
$523 Roundtrip, found 6 days ago
$523
Roundtrip
found 6 days ago
Select Delta flight, departing Mon, Jan 12 from Seattle to Tromsø, returning Tue, Jan 20, priced at $523 found 6 days ago
British Airways
Tue, Jan 20 - Tue, Jan 27
SEA
Seattle
TOS
Tromsø
$533 Roundtrip, found 4 days ago
$533
Roundtrip
found 4 days ago
Select British Airways flight, departing Tue, Jan 20 from Seattle to Tromsø, returning Tue, Jan 27, priced at $533 found 4 days ago
KLM
Tue, Nov 25 - Tue, Dec 9
SEA
Seattle
TOS
Tromsø
$546 Roundtrip, found 3 days ago
$546
Roundtrip
found 3 days ago
Select KLM flight, departing Tue, Nov 25 from Seattle to Tromsø, returning Tue, Dec 9, priced at $546 found 3 days ago

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS) cost?
Secure a cheap one-way flight from $431 or cheap return flight from $468 from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS)?
The cheapest month to fly from SEA to TOS is October, when demand is low. Off-peak months are typically when airlines offer better prices between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SEA to TOS flight.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS)?
You'll need to catch a flight with a layover if you're traveling from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from SEA to TOS?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS)?
Book a flight from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS) that takes off before 3 PM to reduce the risk of cancellations and delays. Departures after this hour are on average 22% more likely to be canceled.**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 Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS) last-minute?
Booking your plane ticket from SEA to TOS just before your trip is typically more expensive. However, if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a SEA to TOS flight and hotel package?
Booking a SEA to TOS flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our extensive range of accommodations and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS)?
Typically, you can cancel or reschedule your SEA to TOS flight. However, there may be additional charges, especially if you booked over 24 hours ago. Check your itinerary for the airline's guidelines and fees on flight changes, or if you want more information, head to our Customer Service portal.

Travel information

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Langnes
Airlines serving
Aer Lingus, Air France, British Airways, Delta, Finnair, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines
Roundtrip price
$468
Distance
4110 mi

Book with confidence

Book with confidence

Seattle to Tromsø Flights

The cheapest times to fly from Seattle to Tromsø

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 Seattle to Tromsø are during the month of October. You can find some of the cheapest flights from Seattle to Tromsø with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Tromsø

Sunday is one of the best days to book for cheap flights from Seattle to Tromsø: 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 Seattle to Tromsø

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 Seattle to Tromsø in 2025. You can also book with separate airlines for your outbound and return journeys, from $431 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 Seattle to Tromsø 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 Seattle to Tromsø 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.

 

Seattle to Tromsø Flights

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*Available to One Key members.