Cheap flights from Seattle to Trondheim from $860
This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Trondheim departing on 11/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Our best Scandinavian Airlines deals on Seattle to Trondheim flight tickets
KLM flights from Seattle to Trondheim
Our best KLM deals on Seattle to Trondheim flight tickets
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Use the filters below to find and compare flights from Seattle to Trondheim that are best for you.
Fly from
Fly to
Route
Depart
Return
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Thu 11/19
10:39 am-2:30 pm
2 stops18h 51m
Trondheim Vaernes
Thu 11/26
6:25 am-8:13 pm
3 stops22h 48m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Thu 11/19
2:35 pm-9:45 pm
2 stops22h 10m
Trondheim Vaernes
Thu 11/26
9:40 am-5:00 pm
2 stops16h 20m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Thu 11/19
10:39 am-3:20 pm
3 stops19h 41m
Trondheim Vaernes
Thu 11/26
6:25 am-8:13 pm
3 stops22h 48m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Thu 11/19
7:27 am-4:35 pm
2 stops24h 08m
Trondheim Vaernes
Thu 11/26
6:20 am-11:47 am
1 stop14h 27m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Thu 11/19
2:35 pm-4:35 pm
1 stop17h 00m
Trondheim Vaernes
Thu 11/26
6:20 am-11:47 am
1 stop14h 27m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Wed 12/23
12:15 pm-2:30 pm
2 stops41h 15m
Trondheim Vaernes
Fri 1/1
7:55 pm-9:42 pm
2 stops34h 47m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Wed 12/23
2:35 pm-4:35 pm
1 stop17h 00m
Trondheim Vaernes
Fri 1/1
6:20 am-3:15 pm
2 stops17h 55m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Wed 12/23
11:15 pm-3:20 pm
3 stops31h 05m
Trondheim Vaernes
Fri 1/1
7:55 pm-10:49 pm
2 stops35h 54m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Wed 12/23
2:35 pm-4:35 pm
1 stop17h 00m
Trondheim Vaernes
Fri 1/1
6:20 am-11:50 am
1 stop14h 30m
SeattleTrondheim
SEA Seattle/Tacoma Intl - TRD Trondheim Vaernes
SEATRD
Seattle/Tacoma Intl
Wed 12/23
7:15 am-2:50 pm
3 stops22h 35m
Trondheim Vaernes
Fri 1/1
6:35 pm-2:45 pm
3 stops29h 10m
When to book flights from Seattle to Trondheim
Cheap Seattle to Trondheim (SEA to TRD) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Trondheim
Frequently asked questions about flying from Seattle to Trondheim
How far is Seattle/Tacoma Intl to Trondheim Vaernes by plane?
Trondheim Vaernes is 4341.0 mi away from Seattle/Tacoma Intl. Flights usually cover this in 17h 20m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Trondheim Vaernes Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Trondheim Vaernes Airport were last updated today.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Trondheim Vaernes Airport?
As of October 2026, there is 1 operator available to choose from for flights from Seattle/Tacoma Intl Airport to Trondheim Vaernes Airport.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Trondheim Vaernes Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Trondheim Vaernes Airport.
What documentation or ID do you need to fly to Trondheim Vaernes Airport?
The required travel and health documents for your Trondheim Vaernes Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Trondheim Vaernes Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from Seattle to Trondheim?
Based on momondo bookings for flights between Seattle and Trondheim, the leading airline is KLM, making up 100% of the total bookings.
Best airlines flying from Seattle to Trondheim
Compare and see reviews for airlines that fly from Seattle to Trondheim with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $510 | Free Cancellation | Rating 7.8 1,577 reviews |
Frequently asked questions about flying from Seattle to Trondheim
How do I get Price Alerts for flights from Seattle to Trondheim?
Price Alerts will notify you by email when the price for flights to Trondheim from Seattle decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.
How can I save money on flights from Seattle to Trondheim with momondo?
By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.
How does momondo find its flight prices?
momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.
Why use momondo?
Why should I use momondo to find a flight deal from Seattle to Trondheim?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Trondheim for you.
Can I find flights from Seattle to Trondheim with flexible booking policies on momondo?
Flights from Seattle to Trondheim with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Seattle to Trondheim?
Once all potential Seattle to Trondheim flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Seattle to Trondheim right now. Can momondo alert me if prices change?
If you are not ready to book a flight from Seattle to Trondheim now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Trondheim and let you know when they change.