I am arriving from South Africa on Christmas Eve to IAD airport. My final destination is RDU. IAD-RDU is mostly made by connections flights. There are a few direct flight, but more expensive then BWI & IAD.

How far is BWI & DCA from IAD? I am thinking of taking of taxi from IAD once I arrive in the morning at 6 A.M. I would like to be in RDU by noon.