QR 3536 then BA 477 at Barcelona
Bilbao → Barcelona → London Heathrow
Timetable, Barcelona time
11:05QR 3536 from Bilbao at the gate
12:25BA 477 to London Heathrow leaves the gatealso IB 3659, AA 6815, VY 9555
1 h 20 apart on the timetable
The last days
QR 3536 and BA 477 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.