Flight
UAL638 4 May 2026
UAL638, operated by United Airlines, on 4 May 2026. Scheduled and actual times are local to each airport (hover for UTC).
Flightestimated
PlaneTrack receiver network| Route | KSFO SAN FRANCISCO INTERNATIONAL → ? |
| Status | Completed (receiver network) |
| First seen airborne | 19:09 PDT 3 May |
| Last seen | 07:06Z |
| Duration | 4h 56m |
| Aircraft | N27539 |
| Max altitude | 30,000 ft |
Punctuality, last 30 days
| Flights | 7 |
| On time | 0 (0%) |
| Average delay | +20 min |
| Worst delay | +25 min |
In the last 30 days UAL638 departed on time (within 15 minutes) on 0 of 7 flights (0%), with an average departure delay of +20 min and a worst delay of +25 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.