U2 820 then U2 8111 at Gatwick
Belfast International → London → Alicante
Timetable, London time
19:05U2 820 from Belfast International at the gate
16:50U2 8111 to Alicante leaves the gate
21 h 45 apart on the timetable, overnight
U2 8111 leaves 21 h 45 after U2 820 arrives on the timetable: more than half a day, so not a connection we count.