Flight
UAL8121 18 Jun 2026
UAL8121, operated by United Airlines, on 18 Jun 2026: San Francisco International (KSFO) to San Luis County Regional Airport (KSBP), 2 legs. Scheduled and actual times are local to each airport (hover for UTC).
Leg 1 of 2
PlaneTrack receiver network| Route | KSFO SAN FRANCISCO INTERNATIONAL → KSBP San Luis County Regional Airport |
| Status | Completed (receiver network) |
| First seen airborne | 21:06 PDT 17 Jun |
| Last seen | 21:48 PDT 17 Jun |
| Duration | 0h 41m |
| Aircraft | N831UA |
| Max altitude | 25,050 ft |
| Distance tracked | 165 nm |
Leg 2 of 2estimated
PlaneTrack receiver network| Route | KSFO SAN FRANCISCO INTERNATIONAL → KSEA SEATTLE TACOMA INTERNATIONAL |
| Status | Completed (receiver network) |
| First seen airborne | 10:46 PDT |
| Last seen | 12:42 PDT |
| Duration | 1h 55m |
| Aircraft | N478UA |
| Max altitude | 34,050 ft |
| Distance tracked | 590 nm |
Punctuality, last 30 days
| Flights | 6 |
| On time | 1 (17%) |
| Average delay | +53 min |
| Worst delay | +156 min |
In the last 30 days UAL8121 departed on time (within 15 minutes) on 1 of 6 flights (17%), with an average departure delay of +53 min and a worst delay of +156 min.
Schedule, departure and arrival times from the FAA SWIM feed; aircraft, altitude and distance from the PlaneTrack receiver network. On time means a departure within 15 minutes of schedule.