Originally Posted by
justsawaufo
....
Upon arriving to IAD, call United and cancel the remaining of the trip. Will it be possible to rebook the same route (plus change fees) later on or not?
Yes, (if not a Basic Economy) needs to be rescheduled within a year of the ticket purchase. The Fare Rules may place other limitations on the rebooking.
Additionally, there could be a fare differential due -- especially if you break the fare at IAD ( but with the airport change is maybe a separate fare)