I used to be able to get to the Tysons/Merrifield area easily but not anymore with work.  What's the scene like around Herndon/Dulles?  Ideally Asian providers, but I'm open-minded

I've been in the same boat. I can get to Tysons every once in a while during lunch break but has to be planned really well because of all the traffic. I'm in the Reston Town Center area and have been surprised to see that not a lot of ladies are in the Reston area.

Many ladies are willing to travel that way.  

I agree with Caressa. There are providers who are DC-based or who are usually out in Tyson's or elsewhere in the burbs, who might be totally happy to head out there. But I do know a few who are regularly out there, too.

...not looking on P411, ads here and so on.  Maybe the type you're looking for though I guess.
I do incall in the Dulles area (or Fairfax which is imo a happy medium between Dulles & Tysons) once in awhile based on request. You and the OP can always request a lady you're interested in to do incall there .

+1  -   More ladies should visit Reston, Herndon, Chantilly, Sterling, and Dulles.   :-