The cheapest times to fly from IAD to TOS are

  • January 1st to March 25th
  • August 27th to September 9th
  • October 8th to December 16th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from IAD to TOS is late January. Prices can be as high as $1914 for Saturday flights during early to mid June, or as low as $774 for Tuesday flights around late January.


When to Fly to Tromsø

Flying from Washington, DC (IAD) to Tromso (TOS) will usually cost between $811 to $1493 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $957. Due to high demand the most expensive time to fly is early to mid June, with an average price of $1511. Planning your trip to low-cost times can easily save you $554 on economy flights and even more on first-class flights. Generally, any price below $1119 can be considered a good price for a round-trip IAD to TOS flight.

See below for a graph of average weekly prices for the IAD to TOS route. All prices are for round-trip tickets in USD.

IAD to TOS Flight Prices

Compared to other flights, the IAD to TOS flight is slightly more expensive than the average and costs about as much as the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.18, which is below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly to Tromsø, and Fridays are the most expensive days to return to Washington. Selecting flights on the least expensive days could save you up to $278 (22%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1002. Return trip prices are from the TOS to IAD flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from IAD to TOS can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 7 hour 57 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from IAD to TOS while comparing.

Destination alternative #1: Evenes Airport (EVE) in Evenes

  • 99 miles (159 km) away from TOS
  • Usually 5.36% less expensive than TOS
  • 2-layover flights available

See IAD to EVE flights


Flight Hacking IAD to TOS

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from IAD to TOS — but Champion Traveler does!

Hack #1: London (IAD > LGW > TOS)

  • Price for both tickets: $882
  • Average savings: $237 (21.19%)

See IAD to LGW flights

Hack #2: Oslo (IAD > OSL > TOS)

  • Price for both tickets: $901
  • Average savings: $218 (19.49%)

See IAD to OSL flights

Hack #3: New York, NY (IAD > JFK > TOS)

  • Price for both tickets: $936
  • Average savings: $183 (16.36%)

See IAD to JFK flights


Flight Questions Answered

Still have questions about flying from IAD to TOS? We’ve got answers.

Which airlines fly this route?

You can find 14 major airlines flying this route most often: Air Canada, Air France, Austrian, Brussels Airlines, Delta, Finnair, Icelandair, KLM, Lufthansa, SAS, SWISS, Turkish Airlines, United, Wideroe, and potentially more during busy seasons.

How far away is it from Langnes Airport to Washington Dulles International Airport?

The distance between the two airports is roughly 3867 miles or 6223 kilometers.

How long does it take to fly from IAD to TOS?

The real-world flight time for a nonstop IAD to TOS flight is about 7 hour 57 minutes.

How many flights go between Washington, DC and Tromso?

It depends on the day of the week and the date, but a typical day might have around 61 available flights from IAD to TOS.


Airport Location Info


Departing Airport

Origination codeIAD
Origination airport nameWashington Dulles International Airport
CityWashington, DC
Countrythe United States

Return Airport

Destination codeTOS
Destination airport nameLangnes Airport


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.