Seattle's position on the Pacific Rim gives it one of the shortest flights to Tokyo of any city in the lower 48. A nonstop takes roughly ten and a half hours outbound and around nine on the way back, which is noticeably shorter than from most other US cities.
It also has several airlines flying the route, including Delta, which has a major presence in Seattle, and Japanese carriers ANA and Japan Airlines, depending on the season. Competition among them keeps fares more reasonable than you might expect. For a broader look at Japan, see our guide to cheap flights to Japan from the US.
