EI 637 then FR 340 at Dublin
Brussels → Dublin → London Luton
Timetable, Dublin time
19:50EI 637 from Brussels at the gate
14:40FR 340 to London Luton leaves the gate
18 h 50 apart on the timetable, overnight
FR 340 leaves 18 h 50 after EI 637 arrives on the timetable: more than half a day, so not a connection we count.