But according to flightradar24.com BA15/BA16 (SIN) and BA33/BA34 (KUL) are practically all on time. Aren't LHR-BKK/KUL/SIN all affected by Pakistan airspace issues as the routes are similar? Is BA9/BA10 badly delayed due to the time of day of the flights?
The detour around Pakistani airspace affects BA15/16 much less than BA9/10.
The images below shows the detour comparing flight paths from January & April on BA9, which is adding on about one hour of flying time:
Jan-19
Apr-19