Nonstop route
Seattle to Dallas nonstop
Yes — Southwest flies SEA to DAL nonstop in the summer season only — about daily.
SEASeattle
✈
DALDallas
daily7.9 flights a week
Summer only7.9/wk Jun vs 0/wk Jan
$125–$250typical one-way · median $175
1,670miles nonstop
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Fares are what people actually paid: half of the 572 tickets in the US DOT fare survey for this route sold between $125 and $250 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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