Originally Posted by Billy Mumphrey

I booked BWI-DEN-BWI and was scheduled changed to BWI-IAH-DEN-IAH-BWI, adding about 3-4 hours of travel in each direction. I called and requested to be put on the IAD-DEN-IAD non-stop flights that depart at almost identical times to my original flights, but was refused by the agent because she said BWI and IAD are not the same "origin". To make the change I'd have to pay the difference in fare (it's roughly 3x more expensive). I usually fly Delta and have always been able to make co-terminal changes in this type of situation. Does United in fact require the exact same airports or did I just get a bad agent?