Seattle to Boston (SEA–BOS) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
SEA–BOS is served by 3 airlines with nonstop service. Alaska Airlines, Delta Air Lines and LATAM Chile lead the route. The flight covers 2,489 miles in approximately 5h 19m. Beyond nonstop, 97 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AS Alaska Airlines Also: HA, JL, KE, QR | 36 | 739, 73J, 7M9, B39M | 5h27-5h38 | Oneworld | HA, JL, KE, QR | |
| DL Delta Air Lines Also: AF, KE, SK, VS | 27 | 32Q, A21N | 5h19-5h34 | SkyTeam | AF, KE, SK, VS | |
| LA LATAM Chile | 3 | 320 | 5h25-5h35 | – | – |
Weekly Schedule Pattern
Connection Landscape
Other ways to reach Boston from Seattle
| Metric | SEA→BOS | BFI→BOS |
|---|---|---|
| Distance from SEA | – | 5 mi |
| Nonstop airlines | 3 | 3 |
| Weekly flights | 134 | 1 |
| Flight time | 5h 19m | 5h 51m |
| Departure OTP | 80% | – |
Travel Essentials
SEA: PDT · BOS: EDT
When it's 6:00 PM in Seattle, it's 9:00 PM in Boston.
Link Light Rail runs from downtown Seattle (Westlake station) to the airport in 38 minutes ($3.50 peak). Trains run every 6–12 minutes during peak hours from 5am to 1am. Ride-shares run $30–50 from downtown; SR-99 and I-5 can be heavily congested southbound during afternoon rush (3–7pm).
Sound Transit 574 express bus serves Tacoma ($2.50–4). Sounder commuter rail connects Tacoma to the airport area via a shuttle.
Silver Line SL1 (free from Logan) runs to South Station in 15–20 minutes, connecting to the Red Line subway and Amtrak services. The Massport Shuttle connects all Logan terminals and the remote parking areas; it's also the transfer between terminals. Water taxi to Long Wharf (downtown) is $12 and runs seasonally; check weather and schedule.Taxis to downtown Boston cost $30–45 (tunnel toll included in meter). Ride-hails pick up at designated zones; follow the Logan app directions to avoid the main curb chaos. MBTA Blue Line (Airport station, free shuttle from terminals) reaches downtown in 10 minutes but requires a separate transfer. Amtrak Acela to New York departs from South Station (2.5h, from $49).
Humid continental climate with significant maritime influence. Winters (December–March) bring regular Nor'easters. These coastal storms that dump heavy snow and produce high winds, frequently closing Logan for hours and causing mass cancellations. Ice storms hit several times each winter. BOS is one of the most weather-disrupted major US airports in winter.
Summers are warm (22–29°C) with humidity and afternoon thunderstorms causing July–August delays. Hurricane remnants reach New England in September–October. Spring and fall are mild (8–18°C) but unpredictable. Logan's harbor location means it runs windier than inland readings suggest. Factor this into small aircraft routing.
SEA–BOS Quick Facts
Frequently Asked Questions
Flights from SEA to BOS
Seattle–Tacoma International Airport (SEA) and Boston Logan International Airport (BOS) are connected by nonstop service from Alaska Airlines, Delta Air Lines and LATAM Chile. With 134 weekly departures, this is a heavily served route.
SEA to BOS Flight Duration and Schedule
Nonstop flight time from SEA to BOS ranges from 5 hours 19 minutes to 5 hours 38 minutes. The route covers a distance of 2,489 miles (4,006 km). There are approximately 134 weekly flights outbound and 183 return, totaling 317 flights per week in both directions.
Connecting Options and Alternatives
97 one-stop connections are available, with the fastest taking approximately 6 hours via ICT. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include Seattle (BFI).