Alaska AirlinesAS
Flights AS101 17:00 daily
live
Direct flights from London (LHR) to Seattle (SEA): 28 nonstop departures observed each week across 4 airlines. 20% of the last 10 operated flights arrived within 15 minutes of schedule. The median arrival is 27 minutes late. No cancellations were recorded across the 10 tracked flights. The nonstop covers 7,702 km, an estimated 10 hours 22 minutes in the air. Measured by Pro Flight Search from live flight boards at London and Seattle. Updated 8 October 2026 at 02:23 UTC.
LHR
London
busy · +22
SEA
Seattle
smooth · +0
7,702 km · ~10h 22m est.
Runs rough · 4 airlines · 28x weekly · nonstop
20% on time
of the last 10 operated LHR → SEA flights arrived within 15 minutes
Median arrival delay is +27 min. 0 of 10 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+27 minacross the last 10 operated legs
Flight time~10h 22mestimated from route distance
Weekly departures28x4 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 10
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesBritish AirwaysDelta Air LinesVirgin Atlantic
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 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at SEA: 32% odds of a 15+ minute delay and around +3 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the London to Seattle route actually runs
Pro Flight Search records official board updates for nonstop LHR 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 — London (LHR) to Seattle (SEA) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/LHR-SEA
LHR to SEA questions
Is LHR–SEA running on time right now?
Smooth skies ahead. The departure side at LHR is the weaker end, route health score 85/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on LHR–SEA?
Operators schedule morning departures around 09:50 and evening departures around 17:00 from LHR. 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 LHR to SEA?
Great-circle distance is 7,702 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 574–690 min gate-to-gate on this route.
How often does LHR–SEA fly?
4 carriers operate this route, around 35 flights a week between them. Compare carrier days and times in the airline list above.
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