Nonstop route
Dulles to Houston nonstop
Yes — United flies IAD to IAH nonstop year-round — about 6× daily.
IADDulles
✈
IAHHouston
6× daily42 flights a week
Year-round42/wk Jun vs 28/wk Jan
$175–$375typical one-way · median $250
1,190miles nonstop
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Fares are what people actually paid: half of the 2,133 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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