The distance from Watertown to Seattle is approximately 2,500 miles. Flying is the most practical mode of transport. Direct flights are available from Boston Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA). The flight time is approximately 6 hours and 30 minutes. Driving is a long multi-day journey across the country.
Total Distance: 4,800 km driving, 4,100 km air distance.
Use the Link Light Rail to get from the airport to downtown.
Summer for the best weather.