Boston Logan to Seattle-Tacoma
2489 miles great-circle distance, typically flown in 5h 24m with 7 airlines operating direct service from Boston Logan (BOS) to Seattle-Tacoma (SEA). Cheapest fares are usually in January (around $249 return), with peak prices in August (around $747). Departures on a Tuesday tend to undercut weekend prices on this corridor.
Flying from Boston Logan
Boston Logan International sits across the harbour from downtown — one of the most central airport locations in the country, just 3 miles from the Financial District. The Silver Line SL1 bus runs free for arriving passengers from each terminal directly to South Station in around 15 minutes; the MBTA Blue Line via the airport shuttle reaches downtown Boston in 25 minutes. JetBlue has its largest base here; Delta and AA add significant capacity, and transatlantic service from Aer Lingus, BA, Virgin and Lufthansa is dense.
Arriving in Seattle
Seattle-Tacoma is 14 miles south of downtown Seattle, with the Link Light Rail Red Line running directly from the airport station to Westlake in 38 minutes for $3.25 — possibly the simplest big-city airport transfer in the United States. Fares peak in mid-summer (June–August) and around Bumbershoot/Labor Day; January and February are the cheapest months despite winter rain.
Who flies BOS to SEA?
| Airline | IATA | Flight time | Cabin |
| JetBlue Airways | B6 | 5h 24m | Economy |
| Delta Air Lines | DL | 5h 24m | Economy |
| American Airlines | AA | 5h 24m | Economy |
| United Airlines | UA | 5h 24m | Economy |
| Southwest Airlines | WN | 5h 24m | Economy |
| Spirit Airlines | NK | 5h 24m | Economy |
| Alaska Airlines | AS | 5h 24m | Economy |
7 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Best time to fly BOS→SEA
Synthesised from 12-month price aggregates. Cheapest months in green, peak in red.
Estimated baseline. Prices update on a 30-day cadence as Travelpayouts data refreshes. Cheapest day-of-week typically Tuesday.
Boston to Seattle FAQs
Direct flights from Boston Logan (BOS) to Seattle-Tacoma (SEA) take approximately 5h 24m for the 2489-mile journey, plus 30–60 minutes of taxi, climb and descent. Total airport-to-airport time depends on cruise winds and air-traffic queueing on approach.
January is typically the cheapest month on this route, with one-way fares from $249. August is the peak — expect prices 2–3× higher. Book 4–8 weeks ahead for best fares; last-minute prices on this corridor rise sharply inside two weeks of departure.
7 carriers operate direct service from Boston Logan (BOS) to Seattle-Tacoma (SEA): JetBlue Airways, Delta Air Lines, American Airlines, United Airlines, Southwest Airlines and 2 more. Frequencies vary by season and carrier — JetBlue Airways typically operates the highest weekly count on this corridor.
No — United States is domestic travel for US citizens. A US passport is not required for the 50 states, DC or US territories (Puerto Rico, US Virgin Islands, Guam, American Samoa, Northern Mariana Islands), though Real ID-compliant ID is required at TSA from May 2025.
Seattle-Tacoma (SEA) is the primary international airport for Seattle. Allow 30–60 minutes for the ground transfer by train, express bus, taxi or rideshare depending on traffic and time of day. See the airport's official website for current train and shuttle timetables.