VY 1391 then U2 2326 at Barcelona
Seville → Barcelona → London Luton
Timetable, Barcelona time
16:20VY 1391 from Seville at the gate
10:20U2 2326 to London Luton leaves the gate
18 h apart on the timetable, overnight
U2 2326 leaves 18 h after VY 1391 arrives on the timetable: more than half a day, so not a connection we count.