EC 7142 then QR 3515 at Barcelona
Strasbourg → Barcelona → Madrid
Timetable, Barcelona time
12:30EC 7142 from Strasbourg at the gate
16:30QR 3515 to Madrid leaves the gate
4 h apart on the timetable
The last days
EC 7142 and QR 3515 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.