flight_takeoff Flight
UAL521
Live map
Recent history last 30
| Date | Aircraft | Route | Takeoff | Landing | Duration | Dep Δ | Arr Δ |
|---|---|---|---|---|---|---|---|
| 2026-07-14 | A12B2D | - | Jul 14, 02:30 UTC | Jul 14, 05:55 UTC | 3h 25m | - | - |
| 2026-07-13 | A448F2 | - | Jul 13, 00:45 UTC | Jul 13, 03:20 UTC | 2h 35m | - | - |
| 2026-07-12 | A448F2 | - | Jul 12, 23:50 UTC | Jul 13, 00:40 UTC | 50m | - | - |
| 2026-07-11 | AB2520 | - | Jul 11, 19:50 UTC | Jul 11, 23:35 UTC | 3h 45m | - | - |
| 2026-07-10 | AA7F2A | - | Jul 10, 23:35 UTC | Jul 11, 02:45 UTC | 3h 10m | - | - |
| 2026-07-09 | A12F09 | - | Jul 9, 23:40 UTC | Jul 10, 03:10 UTC | 3h 30m | - | - |
| 2026-07-08 | A12B2F | - | Jul 8, 23:35 UTC | Jul 9, 02:55 UTC | 3h 20m | - | - |
| 2026-07-08 | A2B7F5 | - | Jul 8, 02:50 UTC | Jul 8, 06:05 UTC | 3h 15m | - | - |
| 2026-07-07 | A4493D | - | Jul 7, 00:30 UTC | Jul 7, 04:00 UTC | 3h 30m | - | - |
| 2026-07-06 | A449A2 | - | Jul 6, 00:10 UTC | Jul 6, 03:30 UTC | 3h 20m | - | - |
| 2026-07-04 | A612A6 | - | Jul 4, 19:40 UTC | Jul 4, 23:30 UTC | 3h 50m | - | - |
| 2026-07-04 | A12F75 | - | Jul 4, 02:40 UTC | Jul 4, 03:30 UTC | 50m | - | - |
| 2026-07-03 | A12EE0 | - | Jul 3, 00:00 UTC | Jul 3, 03:20 UTC | 3h 20m | - | - |
| 2026-07-02 | A2BB83 | - | Jul 2, 01:10 UTC | Jul 2, 04:35 UTC | 3h 25m | - | - |
| 2026-06-30 | AA7F09 | - | Jun 30, 23:50 UTC | Jul 1, 03:20 UTC | 3h 30m | - | - |
| 2026-06-30 | A448D6 | - | Jun 30, 00:00 UTC | Jun 30, 03:20 UTC | 3h 21m | - | - |
| 2026-06-29 | A448D6 | IAH → BOS | Jun 29, 23:47 UTC | Jun 30, 03:20 UTC | 3h 33m | +21m | +3m |
| 2026-06-29 | A2C35A | - | Jun 29, 01:00 UTC | Jun 29, 04:25 UTC | 3h 25m | - | - |
| 2026-06-27 | AB1644 | ATL → IAH | Jun 27, 21:03 UTC | Jun 27, 22:30 UTC | 1h 27m | +59m | -9m |
| 2026-06-27 | AB1644 | - | Jun 27, 20:59 UTC | Jun 27, 22:29 UTC | 1h 30m | - | - |
| 2026-06-26 | A5D68A | - | Jun 26, 23:34 UTC | Jun 27, 03:04 UTC | 3h 30m | - | - |
| 2026-06-26 | A12AE9 | - | Jun 26, 00:10 UTC | Jun 26, 03:24 UTC | 3h 15m | - | - |
| 2026-06-25 | A12AE9 | IAH → BOS | Jun 25, 23:51 UTC | Jun 26, 03:17 UTC | 3h 26m | +36m | -8m |
| 2026-06-24 | A94B08 | - | Jun 24, 23:24 UTC | Jun 25, 02:45 UTC | 3h 20m | - | - |
| 2026-06-21 | A44964 | - | Jun 21, 23:34 UTC | Jun 22, 02:40 UTC | 3h 5m | - | - |
| 2026-06-21 | A44964 | IAH → BOS | Jun 21, 23:36 UTC | Jun 22, 02:40 UTC | 3h 4m | +21m | -14m |
| 2026-06-20 | AA2BA2 | - | Jun 20, 01:09 UTC | Jun 20, 04:24 UTC | 3h 15m | - | - |
| 2026-06-19 | A94B50 | - | Jun 19, 02:29 UTC | Jun 19, 05:45 UTC | 3h 15m | - | - |
| 2026-06-19 | A94B50 | IAH → BOS | Jun 19, 02:36 UTC | Jun 19, 05:41 UTC | 3h 5m | +201m | -15m |
| 2026-06-17 | A12EE7 | - | Jun 17, 23:40 UTC | Jun 18, 03:00 UTC | 3h 20m | - | - |
Performance history
- Flights tracked
- 137 showing last 30
- Avg arrival delay
- -9m
- On-time arrival
- 100% 100% on time
- Aircraft used
- 24
Monthly activity 4 months
| Month | Flights tracked |
|---|---|
| July 2026 | 14 |
| June 2026 | 29 |
| May 2026 | 45 |
| April 2026 | 49 |
UAL521 frequently asked
How long is flight UAL521?
Based on observed flights, UAL521 takes on average 3h 3m from takeoff to landing.
How often does UAL521 fly?
UAL521 has been observed flying several times a week in our tracking data. We've recorded 137 flights under this callsign.
Is flight UAL521 usually on time?
Across recent flights, UAL521 arrives 9 minutes early on average. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL521?
UAL521 has been operated by 24 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.