$399 Cheap Flights from Seattle (SEA) to Tromsø (TOS)

View $399 flight on Sun, Nov 30, 2025Opens 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 $399 for one-way flights and $495 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Wed, Sep 3 - Sun, Sep 7
SEA
Seattle
TOS
Tromsø
$495 Roundtrip, found 4 days ago
$495
Roundtrip
found 4 days ago
Select Scandinavian Airlines flight, departing Wed, Sep 3 from Seattle to Tromsø, returning Sun, Sep 7, priced at $495 found 4 days ago
Scandinavian Airlines
Sun, Aug 24 - Sun, Sep 7
SEA
Seattle
TOS
Tromsø
$511 Roundtrip, found 3 days ago
$511
Roundtrip
found 3 days ago
Select Scandinavian Airlines flight, departing Sun, Aug 24 from Seattle to Tromsø, returning Sun, Sep 7, priced at $511 found 3 days ago
Scandinavian Airlines
Sun, Aug 24 - Sun, Sep 7
SEA
Seattle
TOS
Tromsø
$524 Roundtrip, found 7 hours ago
$524
Roundtrip
found 7 hours ago
Select Scandinavian Airlines flight, departing Sun, Aug 24 from Seattle to Tromsø, returning Sun, Sep 7, priced at $524 found 7 hours ago
Scandinavian Airlines
Wed, Sep 3 - Tue, Sep 16
SEA
Seattle
TOS
Tromsø
$535 Roundtrip, found 7 hours ago
$535
Roundtrip
found 7 hours ago
Select Scandinavian Airlines flight, departing Wed, Sep 3 from Seattle to Tromsø, returning Tue, Sep 16, priced at $535 found 7 hours ago
Scandinavian Airlines
Sun, Aug 24 - Mon, Sep 8
SEA
Seattle
TOS
Tromsø
$535 Roundtrip, found 5 days ago
$535
Roundtrip
found 5 days ago
Select Scandinavian Airlines flight, departing Sun, Aug 24 from Seattle to Tromsø, returning Mon, Sep 8, priced at $535 found 5 days ago
Delta
Wed, Nov 26 - Tue, Dec 9
SEA
Seattle
TOS
Tromsø
$536 Roundtrip, found 7 hours ago
$536
Roundtrip
found 7 hours ago
Select Delta flight, departing Wed, Nov 26 from Seattle to Tromsø, returning Tue, Dec 9, priced at $536 found 7 hours ago
Scandinavian Airlines
Wed, Sep 10 - Mon, Sep 22
SEA
Seattle
TOS
Tromsø
$541 Roundtrip, found 5 days ago
$541
Roundtrip
found 5 days ago
Select Scandinavian Airlines flight, departing Wed, Sep 10 from Seattle to Tromsø, returning Mon, Sep 22, priced at $541 found 5 days ago
KLM
Tue, Nov 25 - Tue, Dec 9
SEA
Seattle
TOS
Tromsø
$545 Roundtrip, found 7 hours ago
$545
Roundtrip
found 7 hours ago
Select KLM flight, departing Tue, Nov 25 from Seattle to Tromsø, returning Tue, Dec 9, priced at $545 found 7 hours ago
Lufthansa
Tue, Jan 27 - Tue, Feb 3
SEA
Seattle
TOS
Tromsø
$667 Roundtrip, found 1 day ago
$667
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Tue, Jan 27 from Seattle to Tromsø, returning Tue, Feb 3, priced at $667 found 1 day ago
British Airways
Thu, Jan 29 - Thu, Feb 12
SEA
Seattle
TOS
Tromsø
$719 Roundtrip, found 8 hours ago
$719
Roundtrip
found 8 hours ago
Select British Airways flight, departing Thu, Jan 29 from Seattle to Tromsø, returning Thu, Feb 12, priced at $719 found 8 hours ago

Alternative airports near Tromsø

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Langnes TOS. Cheapest and Closest option available. Average driving time to city center is 6 minutes. Flights from $842
TOS
Langnes
CheapestClosest
Average driving time to city center6 min
Flights from $842
Flights from Seattle (SEA) to Tromsø (TOS)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Langnes
Airlines serving
Air France, British Airways, Delta, Finnair, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines
Roundtrip price
$494
Distance
4110 mi

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 September. 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 $399 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.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Langnes Airport (TOS) cost?
Discover the latest flight deals from SEA to TOS 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 SEA to TOS?
The cheapest flights from SEA to TOS 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 SEA to TOS?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from SEA to TOS. Sort your results by "Price (lowest to highest)" to snap up a great deal.
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.

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*Available to One Key members.