Nonstop route
Chicago to Seattle nonstop
Yes — Alaska, United, American and Delta fly ORD to SEA nonstop year-round — about 19× daily.
ORDChicago
✈
SEASeattle
19× daily133.2 flights a week
Year-round133.2/wk Jun vs 66.8/wk Jan
$125–$300typical one-way · median $200
1,721miles nonstop
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Fares are what people actually paid: half of the 10,964 tickets in the US DOT fare survey for this route sold between $125 and $300 one way, median $200. 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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