Nonstop route
St Louis to Washington nonstop
Yes — Southwest and American fly STL to DCA nonstop year-round — about 6× daily.
STLSt Louis
✈
DCAWashington
6× daily44.8 flights a week
Year-round44.8/wk Jun vs 41.1/wk Jan
$125–$275typical one-way · median $175
719miles nonstop
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Fares are what people actually paid: half of the 3,694 tickets in the US DOT fare survey for this route sold between $125 and $275 one way, median $175. 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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