EW 7520 then U2 8064 at Barcelona
Hamburg → Barcelona → London Gatwick
Timetable, Barcelona time
09:30EW 7520 from Hamburg at the gate
12:50U2 8064 to London Gatwick leaves the gate
3 h 20 apart on the timetable
The last days
EW 7520 and U2 8064 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.