SEA → BOSSeattle to Boston

live

Direct flights from Seattle (SEA) to Boston (BOS): 21 nonstop departures observed each week across 3 airlines. The median arrival is 14 minutes early. No cancellations were recorded across the 4 tracked flights. The nonstop covers 4,006 km, an estimated 5 hours 38 minutes in the air. Measured by Pro Flight Search from live flight boards at Seattle and Boston. Updated 11 October 2026 at 04:03 UTC.

SEA Seattle smooth · +14
BOS Boston smooth · +0
4,006 km · ~5h 38m est.
dep bank 07:16–23:4221x weekly
Running clean · 3 airlines · 21x weekly · nonstop
91 / 100

route health from live SEA and BOS delay boards

Median arrival delay is −14 min. 0 of 4 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−14 minacross the last 4 operated legs
Flight time~5h 38mestimated from route distance
Weekly departures21x3 direct airlines on the leg

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesDelta Air LinesJetBlue Airways

Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.

Who flies it

observed on the boards · 7 days
Alaska AirlinesAS

Flights AS288 07:18 daily · AS306 09:03 daily · AS460 varies daily · AS214 varies daily

Delta Air LinesDL

Flights DL459 07:16 daily · DL438 varies daily · DL474 16:05 Mo Tu We Th Fr Su · DL473 23:08 daily

JetBlue AirwaysB6

Flights B6398 23:42 daily

History

operated legs · board outcomes
10-10AS288arrived−14
10-10AS306arrived−25
10-10AS460arrived−19
10-10B6398arrived+98

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
SEASeattle +14 min smooth ⛅ mostly cloudy · ENE 4 kt Full SEA delay board →
BOSBoston +0 min smooth 🌤 mostly cloudy · S 4 kt Full BOS delay board →

Weather lens

Current conditions put the pressure at BOS: 38% odds of a 15+ minute delay and around +9 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the Seattle to Boston route actually runs

Pro Flight Search records official board updates for nonstop SEA to BOS flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.

Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — Seattle (SEA) to Boston (BOS) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/SEA-BOS
How we measure this →

SEA to BOS questions

Is SEA–BOS running on time right now?

Smooth skies ahead. The departure side at SEA is the weaker end, route health score 91/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on SEA–BOS?

Operators schedule morning departures around 07:16 and evening departures around 23:08 from SEA. Earlier flights typically land before destination-airport delays accumulate later in the day; check the BOS delay card to confirm conditions when you'd arrive.

How long is the flight from SEA to BOS?

Great-circle distance is 4,006 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 313–373 min gate-to-gate on this route.

How often does SEA–BOS fly?

3 carriers operate this route, around 62 flights a week between them. Compare carrier days and times in the airline list above.