'Uptil'and 'till' are usually used with time. In terms of meaning, there is no difference. 'until' is considered to be the more formal than 'till'.
'Up to' on the other hand is used to refer to distance and not time.
'Until' example:- There are no tickets available until July.
'Up to' example:- You can earn up to rupees 10,000 sitting at home.