Alaska Airlines AS421 Flight Status Tracker
AS421 is a domestic flight operated by Alaska Airlines. AS421 is departing from San Francisco (SFO), United States and arriving at Seattle (SEA), United States. The flight distance is about 1091.83 km or 678.43 miles and flight time is 48 minutes. Get the latest status of AS421 / ASA421 here.
Update on Jan. 11, 2026, 8:11 p.m.
Lastest Status
Arrived Delayed by 40m
| SFO | SEA |
Distance: 1091.83 km / 678.43 miles or 589.54 nautical miles.
Departure San Francisco International Airport
Actual Departure: 09:20
Scheduled Departure: 08:38
Departure Terminal : D2 Gate None
Arrival Seattle Tacoma International Airport
Actual Arrival: 14:35
Scheduled Arrival: 13:55
Arrival Terminal : Gate None
Flight AS421 detail information
| Type | Domestic Flight |
| Route | Departure San Francisco (SFO), United States and arriving at Seattle (SEA), United States |
| Airlines | Alaska Airlines (AS) |
| Aircraft | B739 |
| Flight Duration | 48 minutes |
| Flight Distance | 1091.83 km /678.43 miles |
| Operating Days | Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday |
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AS421 Airports
| Departures |
|---|
| Airport: San Francisco International Airport, United States |
| ICAO Code: SFO |
| SFO Current time: 15:55 11-Jan-2026 |
| Arrivals |
| Airport: Seattle Tacoma International Airport, United States |
| ICAO Code: SEA |
| SEA Current time: 15:55 11-Jan-2026 |