$399 Cheap Flights from Seattle (SEA) to Trondheim (TRD)

View $399 flight on Tue, May 5, 2026Opens in a new window

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

Cheap Flights from Seattle to Trondheim (SEA-TRD)

Prices were available within the past 7 days and start at $399 for one-way flights and $515 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Nov 12 - Fri, Dec 5
SEA
Seattle
TRD
Trondheim
$515 Roundtrip, found 14 hours ago
$515
Roundtrip
found 14 hours ago
Select Delta flight, departing Wed, Nov 12 from Seattle to Trondheim, returning Fri, Dec 5, priced at $515 found 14 hours ago
Delta
Sun, Jan 25 - Fri, Feb 6
SEA
Seattle
TRD
Trondheim
$516 Roundtrip, found 4 hours ago
$516
Roundtrip
found 4 hours ago
Select Delta flight, departing Sun, Jan 25 from Seattle to Trondheim, returning Fri, Feb 6, priced at $516 found 4 hours ago
Delta
Tue, Jan 13 - Tue, Jan 27
SEA
Seattle
TRD
Trondheim
$517 Roundtrip, found 4 days ago
$517
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Jan 13 from Seattle to Trondheim, returning Tue, Jan 27, priced at $517 found 4 days ago
Delta
Sat, Nov 15 - Fri, Dec 5
SEA
Seattle
TRD
Trondheim
$519 Roundtrip, found 14 hours ago
$519
Roundtrip
found 14 hours ago
Select Delta flight, departing Sat, Nov 15 from Seattle to Trondheim, returning Fri, Dec 5, priced at $519 found 14 hours ago
Delta
Sat, Jan 24 - Fri, Feb 6
SEA
Seattle
TRD
Trondheim
$520 Roundtrip, found 4 hours ago
$520
Roundtrip
found 4 hours ago
Select Delta flight, departing Sat, Jan 24 from Seattle to Trondheim, returning Fri, Feb 6, priced at $520 found 4 hours ago
Delta
Sat, Jan 17 - Tue, Jan 27
SEA
Seattle
TRD
Trondheim
$521 Roundtrip, found 4 days ago
$521
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Jan 17 from Seattle to Trondheim, returning Tue, Jan 27, priced at $521 found 4 days ago
Scandinavian Airlines
Thu, Jan 15 - Mon, Jan 19
SEA
Seattle
TRD
Trondheim
$522 Roundtrip, found 16 hours ago
$522
Roundtrip
found 16 hours ago
Select Scandinavian Airlines flight, departing Thu, Jan 15 from Seattle to Trondheim, returning Mon, Jan 19, priced at $522 found 16 hours ago
KLM
Wed, Mar 4 - Wed, Mar 18
SEA
Seattle
TRD
Trondheim
$542 Roundtrip, found 4 hours ago
$542
Roundtrip
found 4 hours ago
Select KLM flight, departing Wed, Mar 4 from Seattle to Trondheim, returning Wed, Mar 18, priced at $542 found 4 hours ago
Finnair
Mon, Apr 13 - Wed, May 13
SEA
Seattle
TRD
Trondheim
$828 Roundtrip, found 22 hours ago
$828
Roundtrip
found 22 hours ago
Select Finnair flight, departing Mon, Apr 13 from Seattle to Trondheim, returning Wed, May 13, priced at $828 found 22 hours ago
Air France
Thu, Jan 15 - Mon, Jan 19
SEA
Seattle
TRD
Trondheim
$907 Roundtrip, found 16 hours ago
$907
Roundtrip
found 16 hours ago
Select Air France flight, departing Thu, Jan 15 from Seattle to Trondheim, returning Mon, Jan 19, priced at $907 found 16 hours ago

Alternative airports near Trondheim

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

Select flight to Vaernes TRD. Cheapest and Closest option available. Average driving time to city center is 29 minutes. Flights from $535
TRD
Vaernes
CheapestClosest
Average driving time to city center29 min
Flights from $535
Flights from Seattle (SEA) to Trondheim (TRD)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Vaernes
Airlines serving
Air France, Delta, Finnair, KLM, Lufthansa, Scandinavian Airlines
Roundtrip price
$514
Distance
4361 mi

Seattle to Trondheim Flights

The cheapest times to fly from Seattle to Trondheim

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

 

The best time to book a flight from Seattle to Trondheim

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

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 Trondheim 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 Trondheim 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 Trondheim 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 Vaernes Airport (TRD) cost?
Get a cheap one-way flight from $399 or cheap return flight from $515 from Seattle - Tacoma Intl. Airport (SEA) to Vaernes Airport (TRD) 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 Vaernes Airport (TRD)?
The cheapest month to fly from SEA to TRD is November, when demand is low. Off-peak season is often when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Vaernes Airport (TRD)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll take you from SEA to TRD. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Vaernes Airport (TRD)?
You'll need to take a flight with a layover when traveling from Seattle - Tacoma Intl. Airport (SEA) to Vaernes Airport (TRD). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from SEA to TRD?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change depending on a range of factors, such as the time of year and airline.*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 Vaernes Airport (TRD)?
To arrive at Vaernes Airport (TRD) on time, choose a flight that leaves from Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Vaernes Airport (TRD) last-minute?
Booking your ticket from SEA to TRD right before your trip is generally more expensive. But if there's some wiggle room with your travel dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a SEA to TRD flight and hotel package?
Opting for a SEA to TRD flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our impressive range of stays and then add car rentals, flights and activities to your booking. Bundle it all 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 Vaernes Airport (TRD)?
Generally, it's possible to reschedule or cancel your SEA to TRD flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.