IB 1458 then U2 7646 at Madrid
Trieste → Madrid → Lisbon
Timetable, Madrid time
17:05IB 1458 from Trieste at the gate
21:25U2 7646 to Lisbon leaves the gate
4 h 20 apart on the timetable
The last days
IB 1458 and U2 7646 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.