A3 275 then BA 631 at Athens
Chios → Athens → London Heathrow
Timetable, Athens time
17:00A3 275 from Chios at the gate
15:00BA 631 to London Heathrow leaves the gate
22 h apart on the timetable, overnight
BA 631 leaves 22 h after A3 275 arrives on the timetable: more than half a day, so not a connection we count.