I need transportation for my kids from home in Reston to school in Herndon (15-minute drive) in the morning around 7:15 and pick up them at 3:00 pm.

Pick up the kids from home in the morning and driving them to school. Drop off at school does not require getting off the car as teachers take the kids at the school door.

In the afternoon, the sitter to pick up the kids from school (the teachers being them outside) and take them back home.