BA 250 then VS 354 at Heathrow
Santiago de Chile → London → Mumbai
Timetable, London time
05:50BA 250 from Santiago de Chile at the gate
18:15VS 354 to Mumbai leaves the gate
12 h 25 apart on the timetable
VS 354 leaves 12 h 25 after BA 250 arrives on the timetable: more than half a day, so not a connection we count.