Nonstop route
Seattle to Washington nonstop
Yes — Alaska, United and Delta fly SEA to IAD nonstop year-round — about 7× daily.
SEASeattle
✈
IADWashington
7× daily45.7 flights a week
Year-round45.7/wk Jun vs 22.4/wk Jan
$175–$375typical one-way · median $250
2,305miles nonstop
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Fares are what people actually paid: half of the 4,722 tickets in the US DOT fare survey for this route sold between $175 and $375 one way, median $250. That survey runs a couple of quarters behind, so treat it as the shape of the route's pricing rather than today's quote.
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