U2 3315 then U2 2644 at Keflavík
Edinburgh → Reykjavík → London Luton
Timetable, Reykjavík time
10:15U2 3315 from Edinburgh at the gate
10:05U2 2644 to London Luton leaves the gate
23 h 50 apart on the timetable, overnight
U2 2644 leaves 23 h 50 after U2 3315 arrives on the timetable: more than half a day, so not a connection we count.