SEA → LHRSeattle to London

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Direct flights from Seattle (SEA) to London (LHR): 28 nonstop departures observed each week across 4 airlines. 86% of the last 35 operated flights arrived within 15 minutes of schedule. The median arrival is 17 minutes early. No cancellations were recorded across the 35 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 Seattle and London. Updated 17 August 2026 at 07:52 UTC.

SEA Seattle smooth · +8
LHR London smooth · +0
7,702 km · ~10h 22m est.
dep bank 13:30–21:4528x weekly
Runs reliable · 4 airlines · 28x weekly · nonstop
86% on time

of the last 35 operated SEA → LHR flights arrived within 15 minutes

Median arrival delay is −17 min. 0 of 35 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Search live fares for this route →
Median arrival−17 minacross the last 35 operated legs
Flight time~10h 22mestimated from route distance
Weekly departures28x4 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 35

Current nonstop fares

SEA → LHR · one way · economy · 1 adult

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TodayChecking…Direct airline fares
TomorrowChecking…Direct airline fares
In one weekChecking…Direct airline fares

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesBritish AirwaysDelta Air LinesVirgin Atlantic 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 AirlinesAS86% on time

Flights AS100 21:40 daily

British AirwaysBA86% on time

Flights BA52 13:30 daily · BA48 20:20 daily

Delta Air LinesDL86% on time

Flights DL20 21:45 daily

Virgin Atlantic AirwaysVS86% on time

Flights VS106 18:20 daily

History

operated legs · board outcomes
08-16AS100arrived−37
08-16BA48arrived−28
08-16BA52arrived−20
08-16DL20dep −5 → arr−27
08-16VS106arrived−33
08-15AS100arrived−25
08-15BA48dep +24 → arr−17
08-15BA52dep +21 → arr+16
08-15DL20arrived−48
08-15VS106arrived−32
08-14AS100arrived+24
08-14BA48dep +30 → arr−13
08-14BA52dep +8 → arr−8
08-14DL20dep −5 → arr−35
08-14VS106arrived−18
08-13AS100dep +40 → arr+12
08-13BA48dep +14 → arr−15
08-13BA52dep +4 → arr+0
08-13DL20dep +120 → arr+114
08-13VS106arrived−17
08-12AS100arrived−8
08-12BA48dep +20 → arr+24
08-12BA52arrived−3
08-12DL20dep −5 → arr−32
08-12VS106arrived−31
08-11AS100arrived−18
08-11BA48arrived−21
08-11BA52arrived+2
08-11DL20dep −5 → arr−38
08-11VS106arrived−39
08-10AS100arrived−12
08-10BA48dep +0 → arr−6
08-10BA52dep +36 → arr+8
08-10DL20arrived−19
08-10VS106dep +121 → arr+84

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 +8 min smooth 🌤 clear · WNW 4 kt Full SEA delay board →
LHRLondon +0 min smooth 🌤 clear · NW 7 kt Full LHR delay board →

Weather lens

Current conditions put the pressure at SEA: 34% odds of a 15+ minute delay and around +2 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 London route actually runs

Pro Flight Search tracks every published board update for nonstop SEA to LHR flights: 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. Fares link straight to the operating airline with no markups.

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 London (LHR) route reliability, measured from operated flights on official airport boards.

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

SEA to LHR questions

Is SEA–LHR running on time right now?

Smooth skies ahead. The departure side at SEA is the weaker end, route health score 94/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on SEA–LHR?

Operators schedule evening departures around 18:20 from SEA. Earlier flights typically land before destination-airport delays accumulate later in the day; check the LHR delay card to confirm conditions when you'd arrive.

How long is the flight from SEA to LHR?

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 SEA–LHR fly?

4 carriers operate this route, around 35 flights a week between them. Compare carrier days and times in the airline list above.