QR 3721 then BA 487 at Barcelona
Granada → Barcelona → London Heathrow
Timetable, Barcelona time
22:50QR 3721 from Granada at the gate
19:20BA 487 to London Heathrow leaves the gatealso IB 3668, AA 6823, VY 9565
20 h 30 apart on the timetable, overnight
BA 487 leaves 20 h 30 after QR 3721 arrives on the timetable: more than half a day, so not a connection we count.