Flight
UAL1851 3 May 2026
UAL1851, operated by United Airlines, on 3 May 2026, 2 legs. Scheduled and actual times are local to each airport (hover for UTC).
Leg 1 of 2partial
PlaneTrack receiver network| Route | Route not recorded |
| Status | Partial record (receiver network) |
| First seen airborne | 00:00Z |
| Aircraft | N12021 |
| Max altitude | 39,000 ft |
Leg 2 of 2
PlaneTrack receiver network| Route | KSFO SAN FRANCISCO INTERNATIONAL → KORD CHICAGO OHARE INTERNATIONAL |
| Status | Completed (receiver network) |
| First seen airborne | 15:40 PDT |
| Last seen | 21:22 CDT |
| Duration | 3h 41m |
| Aircraft | A2452C |
| Distance tracked | 1,600 nm |
Punctuality, last 30 days
| Flights | 7 |
| On time | 4 (57%) |
| Average delay | -77 min |
| Worst delay | +380 min |
In the last 30 days UAL1851 departed on time (within 15 minutes) on 4 of 7 flights (57%), with an average departure delay of -77 min and a worst delay of +380 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.