EC 1009 then FR 4545 at Barcelona
Basel → Barcelona → Porto
Timetable, Barcelona time
19:45EC 1009 from Basel at the gate
20:40FR 4545 to Porto leaves the gate
55 min apart on the timetable
The last days
EC 1009 and FR 4545 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.