BA 468 then U2 7646 at Madrid
London Heathrow → Madrid → Lisbon
Timetable, Madrid time
20:30BA 468 from London Heathrow at the gate
21:25U2 7646 to Lisbon leaves the gate
55 min apart on the timetable
The last days
BA 468 and U2 7646 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.