FI 470 then U2 819 at Gatwick
Reykjavík → London → Belfast International
Timetable, London time
10:55FI 470 from Reykjavík at the gate
08:35U2 819 to Belfast International leaves the gate
21 h 40 apart on the timetable, overnight
U2 819 leaves 21 h 40 after FI 470 arrives on the timetable: more than half a day, so not a connection we count.