BA 1413 then AY 1334 at Heathrow
Belfast City → London → Helsinki
Timetable, London time
09:15BA 1413 from Belfast City at the gate
13:35AY 1334 to Helsinki leaves the gate
4 h 20 apart on the timetable
The last days
BA 1413 and AY 1334 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.