I am thinking of going to visit family in california this summer and i was wondering if it's better to go from washington dulles to san diego direct or is it better to have a layover in a united hub city going in that direction and back. Are direct IAD -SAN bound and direct SAN-IAD flights harder and fuller to get seats on then making a connection at a united hub to get to san diego. I would guess it's more $$ to go direct on that route? any ideas on this issue would love to hear from more united flyers fans!