Nonstop route
San Diego to Seattle nonstop
Yes — Alaska, Delta and Southwest fly SAN to SEA nonstop year-round — about 14× daily.
SANSan Diego
✈
SEASeattle
14× daily100.6 flights a week
Year-round100.6/wk Jun vs 74.7/wk Jan
$125–$275typical one-way · median $175
1,050miles nonstop
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Fares are what people actually paid: half of the 10,759 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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