Nonstop route
Cincinnati / Covington to Boston nonstop
Yes — Delta flies CVG to BOS nonstop year-round — about 6× daily.
CVGCincinnati / Covington
✈
BOSBoston
6× daily39.9 flights a week
Year-round39.9/wk Jun vs 28.2/wk Jan
$175–$400typical one-way · median $250
752miles nonstop
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Fares are what people actually paid: half of the 2,055 tickets in the US DOT fare survey for this route sold between $175 and $400 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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