Flights Boston → Seattle — September 13, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Sunday, September 13, 2026 on the Boston–Seattle route: 1 stop itinerary (2 flights) via Chicago O'Hare (ORD), from Boston Logan (BOS) to Seattle-Tacoma (SEA), first flight United Airlines UA1414, departs 6:00 AM, arrives 11:32 AM, total travel time 8h 32m including layovers, flight time 7h 41m (layovers excluded), $326 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 9, 2026 and read by AirSource on September 10, 2026, 20:47 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Alaska Airlines AS459, from Boston Logan (BOS) to Seattle-Tacoma (SEA), departs 7:12 AM, arrives 10:25 AM, direct, 6h 13m, $336 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.