SQ 387 then U2 8064 at Barcelona
Madrid → Barcelona → London Gatwick
Timetable, Barcelona time
11:15SQ 387 from Madrid at the gate
12:50U2 8064 to London Gatwick leaves the gate
1 h 35 apart on the timetable
The last days
SQ 387 and U2 8064 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.