Nonstop route
Washington to St. Louis nonstop
Yes — Southwest and American fly DCA to STL nonstop year-round — about 6× daily.
DCAWashington
✈
STLSt. Louis
6× daily44.8 flights a week
Year-round44.8/wk Jun vs 42/wk Jan
$125–$275typical one-way · median $175
719miles nonstop
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Fares are what people actually paid: half of the 3,693 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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