The journey from Bellevue to Washington, D.C. is a cross-country trip. The most practical mode is a direct flight from Seattle-Tacoma International Airport (SEA) to Dulles (IAD) or Reagan National (DCA), taking about 5 hours. Driving is a 4,500-kilometer trek that typically takes 40 hours of driving time.
Total Distance: Driving distance 4,550 km, straight-line air distance 3,750 km.
Reagan National (DCA) is much closer to downtown D.C. than Dulles (IAD).
Spring for the Cherry Blossom Festival or Fall for pleasant weather.