Originally Posted by
lds89
Technically, you are not allowed to SDC on international itineraries. However, as another poster mentions, sometimes you can get an agent to change this for you at the airport. Other times the app or website will let you make the change yourself. I usually check that option first. But don't count on it as it's not technically allowed as part of SDC rules.
The problem for OP is that he then has to go to whichever WAS airport it is, find an agent, see if he can change the flight (it's not really an SDC, but an agent making the change & waiving the fee) and then either going home or sitting around IAD/DCA for however many hours it is.
But, because OP won't know until he gets to the airport, he has to bring his bags and be prepared to fly as scheduled.