$705 Cheap Flights from Trondheim (TRD) to Seattle (SEA)

View $705 flight on Sun, Oct 12, 2025Opens in a new window

Popular airlines from Vaernes Airport (TRD) to Seattle-Tacoma International Airport (SEA)

Cheap Flights from Trondheim to Seattle (TRD-SEA)

Prices were available within the past 7 days and start at $705 for one-way flights and $495 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Oct 7 - Mon, Oct 13
TRD
Trondheim
SEA
Seattle
$495 Roundtrip, found 6 days ago
$495
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Oct 7 from Trondheim to Seattle, returning Mon, Oct 13, priced at $495 found 6 days ago
Delta
Wed, Oct 1 - Wed, Oct 8
TRD
Trondheim
SEA
Seattle
$505 Roundtrip, found 6 days ago
$505
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Oct 1 from Trondheim to Seattle, returning Wed, Oct 8, priced at $505 found 6 days ago
Delta
Wed, Oct 1 - Thu, Oct 9
TRD
Trondheim
SEA
Seattle
$533 Roundtrip, found 6 days ago
$533
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Oct 1 from Trondheim to Seattle, returning Thu, Oct 9, priced at $533 found 6 days ago
Scandinavian Airlines
Thu, Oct 2 - Wed, Oct 8
TRD
Trondheim
SEA
Seattle
$573 Roundtrip, found 6 days ago
$573
Roundtrip
found 6 days ago
Select Scandinavian Airlines flight, departing Thu, Oct 2 from Trondheim to Seattle, returning Wed, Oct 8, priced at $573 found 6 days ago
Scandinavian Airlines
Thu, Oct 2 - Sun, Oct 12
TRD
Trondheim
SEA
Seattle
$603 Roundtrip, found 6 days ago
$603
Roundtrip
found 6 days ago
Select Scandinavian Airlines flight, departing Thu, Oct 2 from Trondheim to Seattle, returning Sun, Oct 12, priced at $603 found 6 days ago
Scandinavian Airlines
Thu, Oct 2 - Fri, Oct 10
TRD
Trondheim
SEA
Seattle
$627 Roundtrip, found 6 days ago
$627
Roundtrip
found 6 days ago
Select Scandinavian Airlines flight, departing Thu, Oct 2 from Trondheim to Seattle, returning Fri, Oct 10, priced at $627 found 6 days ago
Delta
Sun, Oct 5 - Mon, Oct 13
TRD
Trondheim
SEA
Seattle
$631 Roundtrip, found 6 days ago
$631
Roundtrip
found 6 days ago
Select Delta flight, departing Sun, Oct 5 from Trondheim to Seattle, returning Mon, Oct 13, priced at $631 found 6 days ago
KLM
Thu, Oct 2 - Thu, Oct 9
TRD
Trondheim
SEA
Seattle
$697 Roundtrip, found 6 days ago
$697
Roundtrip
found 6 days ago
Select KLM flight, departing Thu, Oct 2 from Trondheim to Seattle, returning Thu, Oct 9, priced at $697 found 6 days ago
Lufthansa
Fri, Oct 24 - Tue, Nov 25
TRD
Trondheim
SEA
Seattle
$844 Roundtrip, found 5 days ago
$844
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Fri, Oct 24 from Trondheim to Seattle, returning Tue, Nov 25, priced at $844 found 5 days ago
Widerøe
Sat, Oct 4 - Sat, Oct 11
TRD
Trondheim
SEA
Seattle
$1,020 Roundtrip, found 3 days ago
$1,020
Roundtrip
found 3 days ago
Select Widerøe flight, departing Sat, Oct 4 from Trondheim to Seattle, returning Sat, Oct 11, priced at $1,020 found 3 days ago
Flights from Trondheim (TRD) to Seattle (SEA)
Origin airport
Vaernes
Destination airport
Seattle - Tacoma Intl.
Roundtrip price
$495
Distance
4361 mi

Trondheim to Seattle Flights

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

 

The best time to book a flight from Trondheim to Seattle

Sunday is one of the best days to book for cheap flights from Trondheim 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 Trondheim 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 Trondheim to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $705 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 Trondheim 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 Trondheim 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 Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA) cost?
Snag a cheap one-way flight from $705 or cheap return flight from $495 from Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA)?
October is the most affordable month to fly from TRD to SEA. Timing your trip outside of the busy season is often the key to finding better deals on flights.
What is the cheapest airline that flies from Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA)?
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 see which carrier offers the cheapest TRD to SEA flight.
How many flights per day from Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA)?
There are no daily direct flights departing from Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA). But you can choose flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from TRD to SEA?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can vary based on a number of factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA)?
To reach Seattle - Tacoma Intl. Airport (SEA) without delays, select a flight that leaves Vaernes Airport (TRD) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your flight from TRD to SEA just before your trip is generally more expensive. But if you're flexible with your travel dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a TRD to SEA flight and hotel package?
You'll generally save money by booking a TRD 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 easy to manage it all in one convenient place. After selecting your preferred accommodations and flights, consider adding extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Vaernes Airport (TRD) to Seattle - Tacoma Intl. Airport (SEA)?
Typically, you're able to reschedule or cancel your TRD to SEA flight. However, there may be additional charges, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's rules and fees on flight changes, or if you'd like more information, visit our Customer Service portal.

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*Available to One Key members.