U2 8181 then A3 4020 at Athens
London Gatwick → Athens → Thessaloniki
Timetable, Athens time
12:15U2 8181 from London Gatwick at the gate
18:30A3 4020 to Thessaloniki leaves the gate
6 h 15 apart on the timetable
The last days
U2 8181 and A3 4020 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.