Originally Posted by
tazi
If the conference is near the Inner Harbor, which is likely, Baltimore is very easy to get out of. Quick and easy to get on 95.
I got turned around once -- it was in the middle of rush hour and took me awhile to recover and get "out".
At any rate -- if the OP is a driver, renting the car the night BEFORE is the best bet. Pick up near BWI/Baltimore (poss even from your hotel) and return the next evening at Dulles. If the OP is NOT a driver, then arrange with a sedan company the day before for a timed pickup. I wouldn't rely on a taxi in Baltimore, those cars are literally falling apart!!
Assume a 90 minutes for the ride -- if you have a GPS, bring it along and program it beforehand. As soon as the meeting is over, you need to be gone just in case you run into a problem with traffic (that is a frequent problem in this area)
ps and if there is any way to switch the flight to BWI, look into that as well