Originally Posted by rowenb

However, now that I'm in midair, when I check the app and go to 'flight status' I see not only the flight I'm on and the IAD-SAN flight they were booked on (which left on time), but I also see IAD-IAH and IAH-SAN flights.

My working hypothesis is that there were bumped from the direct flight and re-routed through IAH. I can't think of a way to confirm that from midair, I think I'd need to call United.