BOS → SEABoston to Seattle

live

Direct flights from Boston (BOS) to Seattle (SEA): 21 nonstop departures observed each week across 3 airlines. The median arrival is 17 minutes late. No cancellations were recorded across the 3 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 Boston and Seattle. Updated 18 October 2026 at 07:22 UTC.

Today, BOS → SEA

Sun 18 Oct · local times
  1. 07:03 AS459Alaska On scheduleGate B35A · TB SEA 10:20scheduled
  2. 07:55 DL384Delta Air Lines On scheduleGate A13 · TA SEA est. 11:08sched 11:20
  3. 09:03 AS215Alaska On scheduleGate B35A · TB SEA 12:20scheduled
  4. 10:50 DL332Delta Air Lines On scheduleGate A22 · TA SEA est. 14:06sched 14:12
  5. · AS288Alaska On schedule SEA 20:17scheduled
  6. · AS306Alaska On schedule SEA 21:59scheduled
  7. · B6397JetBlue On schedule SEA 22:42scheduled
  8. · DL2889Delta Air Lines On schedule SEA est. 18:59sched 19:05
  9. · DL797Delta Air Lines On schedule SEA est. 22:38sched 22:49

Checked BOS board 03:09 · SEA board 00:22

BOS Boston smooth · +12
SEA Seattle smooth · +0
4,006 km · ~5h 38m est.
dep bank 07:03–19:2521x weekly
Running clean · 3 airlines · 21x weekly · nonstop
92 / 100

route health from live BOS and SEA delay boards

Median arrival delay is +17 min. 0 of 3 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival+17 minacross the last 3 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 AS459 07:03 daily · AS215 09:03 daily · AS288 16:58 daily · AS306 18:40 daily

Delta Air LinesDL

Flights DL384 07:55 daily · DL332 10:50 daily · DL2889 15:47 Mo Tu We Th Fr Su · DL797 19:25 daily

JetBlue AirwaysB6

Flights B6397 19:20 daily

History

operated legs · board outcomes
10-17AS215departed+0
10-17AS288departed+42
10-17AS306departed+17

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
BOSBoston +12 min smooth 🌤 clear · W 5 kt Full BOS delay board →
SEASeattle +0 min smooth 🌤 clear · NNE 4 kt Full SEA delay board →

Weather lens

Current conditions put the pressure at BOS: 42% 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 Boston to Seattle route actually runs

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

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

BOS to SEA questions

Is BOS–SEA running on time right now?

Smooth skies ahead. The departure side at BOS is the weaker end, route health score 92/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on BOS–SEA?

Operators schedule morning departures around 07:03 and evening departures around 18:40 from BOS. Earlier flights typically land before destination-airport delays accumulate later in the day; check the SEA delay card to confirm conditions when you'd arrive.

How long is the flight from BOS to SEA?

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 BOS–SEA fly?

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