SQ 387 then IB 5420 at Barcelona
Madrid → Barcelona → London Gatwick
Timetable, Barcelona time
11:15SQ 387 from Madrid at the gate
18:10IB 5420 to London Gatwick leaves the gatealso LL 5420, VY 7624, BA 8078
6 h 55 apart on the timetable
The last days
SQ 387 and IB 5420 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.