Originally Posted by
Often1
1. If you have a 5 PM departure, you should be at IAD and in the checkpoint line at 3 PM (leave DC no later than 2:15).
2. In addition to the Udvar Hazy (Air & Space Annex next to IAD and accessible by shuttle bus), if you are wiped out and want some sleep, you should be able to find a dirt cheap day rate at one of the IAD hotels. The best rates aren't published, but simply booked by calling the front desk (not the 800#).
3. If you go into the city, I'd make arrangements for a car service for the day.
45 minutes from downtown DC to IAD? You guys live more dangerously than I! I've had middle-of-the-day cab rides that took a fair amount more time than that (traffic that came out of nowhere, or so it seemed to me).
But absolutely anyone with time to kill should see the Udvar Hazy complex. What an incredible place! Two hours killed easily, more if you want, and they have inexpensive storage lockers.