Flight
UAL521 4 Sep 2026
UAL521, operated by United Airlines, on 4 Sep 2026: George Bush Intcntl Houston (KIAH) to General Edward Lawrence Logan International (KBOS). Scheduled and actual times are local to each airport (hover for UTC).
Flight
PlaneTrack receiver network| Route | KIAH GEORGE BUSH INTCNTL HOUSTON → KBOS GENERAL EDWARD LAWRENCE LOGAN INTERNATIONAL |
| Status | Completed (receiver network) |
| First seen airborne | 19:29 CDT 3 Sep |
| Last seen | 23:40 EDT 3 Sep |
| Duration | 3h 10m |
| Aircraft | N27511 |
| Max altitude | 35,000 ft |
| Distance tracked | 1,386 nm |
Punctuality, last 30 days
| Flights | 7 |
| On time | 5 (71%) |
| Average delay | -698 min |
| Worst delay | +228 min |
In the last 30 days UAL521 departed on time (within 15 minutes) on 5 of 7 flights (71%), with an average departure delay of -698 min and a worst delay of +228 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.