B61621 LondonLHR · 08:40 BostonBOS · 11:19
B61621 by JetBlue Airways flies from London (LHR) to Boston (BOS) for the Mon, Sep 14 departure.
departs LHR · on schedule
board checked 21m ago · checking again in 45s
Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival +7 min · 0 cancelled · 7 operations tracked
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by BOS (Boston), currently flying IFR (instrument). For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other London to Boston flights today
same route · JetBlue AirwaysIf B61621 is cancelled, this is the other JetBlue Airways nonstop flight from London to Boston on the same day, with scheduled departure times in LHR local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How B61621 actually runs
Pro Flight Search has tracked every published board update for B61621 across the LHR and BOS boards: schedule changes, gate pushes and actual clocks. Usually lands ~11 min late. Based on 6 confirmed landings · 5/6 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how B61621 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as LHR and BOS published them.
Planning around B61621? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — B61621 London to Boston on-time performance, measured from the LHR and BOS airport boards.
https://proflightsearch.com/flight/B61621
.