Alaska Airlines flies SEA → SMF — 12 flight numbers on record (AS681, AS1540, AS542). 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 Alaska Airlines flight number observed on SEA → SMF. 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? SMF to SEA, or compare a full itinerary.