I am travelling into London on Saturday afternoon & I will be staying in an area that is within the congestion zone. As it is a weekend I understand that I am exempt for paying. But I will be leaving this area on Monday, so do I have to pay the charge as I am coming out of a zone
Assuming you are driving a vehicle within the zone and not taking public transit or a cab (in which case you don't need to pay), as long as you are out of the congestion zone by 0700 Monday morning, you will not have to pay.
The Congestion Charge is an £11.50 daily charge for driving a vehicle within the charging zone between 07:00 and 18:00, Monday to Friday.