IB 415 then QR 3578 at Barcelona
Madrid → Barcelona → Rome
Timetable, Barcelona time
16:15IB 415 from Madrid at the gatealso LA 1522, LL 3015, VY 5057, AV 6016, QR 6889, BA 7134, AA 8630
21:05QR 3578 to Rome leaves the gatealso IB 5772, LL 5772
4 h 50 apart on the timetable
The last days
IB 415 and QR 3578 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.