OS 542 then BA 697 at Vienna
Venezia → Vienna → London Heathrow
Timetable, Vienna time
12:05OS 542 from Venezia at the gate
17:05BA 697 to London Heathrow leaves the gate
5 h apart on the timetable
The last days
OS 542 and BA 697 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.