Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Koh Samui to Mumbai as you normally would.
Ko Samui
Mumbai Chhatrapati Shivaji Intl
2 stops
29h 30mMultiple Airlines
Ko Samui
Mumbai Chhatrapati Shivaji Intl
1 stop
8h 50mMultiple Airlines
Ko Samui
Mumbai Chhatrapati Shivaji Intl
3 stops
23h 35mMultiple Airlines