BA851 PraguePRG · 10:10 LondonLHR · 11:20
BA851 by British Airways flies from Prague (PRG) to London (LHR) for the Fri, Sep 18 departure.
arrived at LHR · 19 min early
Where the minutes go
last 3 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Early read, sample still buildingConditions at PRG and LHR are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days. This route's tracked sample is still thin — treat these as an early read, not a precise forecast.
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 Prague to London flights today
same route · British AirwaysIf BA851 is cancelled, these are the other British Airways nonstop flights from Prague to London on the same day, with scheduled departure times in PRG local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How BA851 actually runs
Pro Flight Search has tracked every published board update for BA851 across the PRG and LHR boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 3 completed legs so far: left right on schedule but landed about 19 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how BA851 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 PRG and LHR published them.
Planning around BA851? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — BA851 Prague to London on-time performance, measured from the PRG and LHR airport boards.
https://proflightsearch.com/flight/BA851
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