United Airlines flies IAD → PHX — 1 flight number on record (UA1938). No departures are in the next-48h assignment window yet; aircraft assignments publish about two days out.
Counted from live tail assignments over the next 48 hours. A route with no equipped departures today can still get one — assignments publish about two days before departure.
Every United Airlines flight number observed on IAD → PHX. A dot marks numbers currently in the schedule window; the rest are from the observed route history. Follow any number for its per-flight Starlink record.
Want the reverse leg? PHX to IAD, or compare a full itinerary.