QR 3630 then BA 487 at Barcelona
Firenze → Barcelona → London Heathrow
Timetable, Barcelona time
14:55QR 3630 from Firenze at the gate
19:20BA 487 to London Heathrow leaves the gatealso IB 3668, AA 6823, VY 9565
4 h 25 apart on the timetable
The last days
QR 3630 and BA 487 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.