Originally Posted by
Benny8444
Are you planning on going to sleep at all or staying up all night?
There are some hostels in the Adams Morgan area where you can get a cheap place to sleep then take the bus to IAD for your KE flight.
Have you considered Pricelining a hotel? Try a low-ball figure -- what do you have to lose? A few hours of sleep would allow you to better enjoy the time you have here.