flight_takeoff Flight
UAL521
Live map
Recent history last 5
| Date | Aircraft | Route | Takeoff | Landing | Duration | Dep Δ | Arr Δ |
|---|---|---|---|---|---|---|---|
| 2026-04-13 | AB48E8 | - | Apr 13, 20:20 UTC | Apr 13, 22:00 UTC | 1h 40m | - | - |
| 2026-04-13 | A52898 | JFK → SFO | Apr 13, 04:20 UTC | Apr 13, 06:05 UTC | 1h 45m | - | - |
| 2026-04-13 | A52898 | - | Apr 13, 03:55 UTC | Apr 13, 06:05 UTC | 2h 10m | - | - |
| 2026-04-13 | A52898 | JFK → SFO | Apr 13, 02:51 UTC | Apr 13, 06:03 UTC | 3h 12m | +189m | -8m |
| 2026-04-12 | A47809 | JFK → SFO | Apr 12, 20:17 UTC | Apr 12, 21:45 UTC | 1h 28m | +20m | -19m |
Performance history
- Flights tracked
- 5
- Avg arrival delay
- -13m
- On-time arrival
- 100% 100% on time
- Aircraft used
- 3
Monthly activity 1 month
| Month | Flights tracked |
|---|---|
| April 2026 | 5 |
UAL521 frequently asked
How long is flight UAL521?
Based on observed flights, UAL521 takes on average 2h 3m from takeoff to landing.
How often does UAL521 fly?
UAL521 has been observed flying occasionally in our tracking data. We've recorded 5 flights under this callsign.
Is flight UAL521 usually on time?
Across recent flights, UAL521 arrives 13 minutes early on average. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL521?
UAL521 has been operated by 3 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL521 live?
Yes. When UAL521 is currently airborne, the live tracker map above shows its real-time position from ADS-B broadcasts. If the map is empty, the flight is not currently in the air.