Nonstop route
Houston to Washington nonstop
Yes — United flies IAH to DCA nonstop year-round — about 9× daily.
IAHHouston
✈
DCAWashington
9× daily63.7 flights a week
Year-round63.7/wk Jun vs 59.4/wk Jan
$175–$375typical one-way · median $250
1,208miles nonstop
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Fares are what people actually paid: half of the 3,575 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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