Nonstop route
Ontario to Seattle nonstop
Yes — Alaska and Frontier fly ONT to SEA nonstop year-round — about 8× daily.
ONTOntario
✈
SEASeattle
8× daily55.3 flights a week
Year-round55.3/wk Jun vs 35.5/wk Jan
$100–$225typical one-way · median $150
956miles nonstop
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Fares are what people actually paid: half of the 5,690 tickets in the US DOT fare survey for this route sold between $100 and $225 one way, median $150. 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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