Flight
UAL3921
Flight history and live tracking for UAL3921, operated by United Airlines. Recent flights from the PlaneTrack independent receiver network, with departure and arrival times, aircraft used, and a real-time position feed.
Route
| Airline | United Airlines |
| Observed route | KSFO → KIAH |
Flight history 38 flights since Sep 2025
| Date | From | To | Dep | Arr | Duration | Aircraft |
|---|---|---|---|---|---|---|
| 2026-08-21 | KLAX LOS ANGELES INTERNATIONAL | KSAN SAN DIEGO INTERNATIONAL LINDBERGH FLD | 07:28 PDT | 07:59 PDT | 0h 31m | N37474 |
| 2026-08-17estimated | ? | ? | 01:39Z | 11:22Z | 9h 42m | N29907 |
| 2026-08-14estimated | ? | ? | 00:11Z | 17:02Z | 16h 50m | N75858 |
Earlier flights (35) - back to 2025-09-23
| Date | From | To | Dep | Arr | Duration | Aircraft |
|---|---|---|---|---|---|---|
| 2026-07-21estimated | ? | ? | 18:07Z | 18:56Z | 0h 48m | N458UA |
| 2026-07-17partial | KORD | ? | 19:06 CDT | N684UA | ||
| 2026-07-16estimated | ? | ? | 00:00Z | 00:18Z | 0h 18m | N684UA |
| 2026-07-15estimated | KSFO | KIAH | 13:27 PDT | 18:58 CDT | 3h 30m | N684UA |
| 2026-07-08estimated | KIAD | ? | 10:28 EDT | 15:20Z | 0h 51m | N66051 |
| 2026-07-04 | KPIT | KORD | 09:45 EDT | 09:46 CDT | 1h 00m | N12238 |
| 2026-07-01 | KMCO | KEWR | 03:12 EDT | 07:48 EDT | 4h 35m | A126E7 |
| 2026-06-28 | KSFO | KIAH | 10:19 PDT | 18:37 CDT | 6h 17m | N796UA |
| 2026-06-26estimated | KSJC | KSFO | 17:00 PDT | 18:18 PDT | 1h 18m | N684UA |
| 2026-06-25 | KEWR | ? | 14:31 EDT | 23:58Z | 5h 26m | N684UA |
| 2026-06-20 | KEWR | KIAH | 12:05 EDT | 14:44 CDT | 3h 38m | N217UA |
| 2026-06-18estimated | KEWR | KIAD | 12:20 EDT | 13:38 EDT | 1h 17m | N2333U |
| 2026-06-15 | KORD | KLGA | 05:37 CDT | 08:10 EDT | 1h 32m | A0B7B7 |
| 2026-06-13 | KEWR | KCLT | 05:13 EDT | 06:46 EDT | 1h 32m | AA7F23 |
| 2026-06-12 | KIAH | KSFO | 07:26 CDT | 08:54 PDT | 3h 27m | N29971 |
| 2026-05-29 | KLAX | KDEN | 07:14 PDT | 12:23 MDT | 4h 09m | A0B7BD |
| 2026-05-26 | EGPH | KIAD | 15:11 BST | 18:12 EDT | 8h 00m | N19136 |
| 2026-05-22 | KIAD | KSFO | 11:08 EDT | 13:12 PDT | 5h 03m | AB0F89 |
| 2026-05-20 | CYYZ | KORD | 00:03 EDT | 23:22 CDT | 0h 18m | N445UA |
| 2026-05-19partial | KIAH | ? | 20:31 CDT | N47288 | ||
| 2026-05-09 | KSAN | KEWR | 07:55 PDT | 17:20 EDT | 6h 24m | N18119 |
| 2026-05-06 | KIAD | KORD | 07:23 EDT | 11:14 CDT | 4h 51m | N27903 |
| 2026-05-03estimated | KBED | KIAD | 20:00 EDT | 21:18 EDT | 1h 17m | N648UA |
| 2026-05-02estimated | LEBL | KPWM | 18:23 CEST | 19:58 EDT | 7h 35m | N648UA |
| 2026-04-27 | KORD | KDEN | 05:01 CDT | 06:38 MDT | 2h 36m | A0B889 |
| 2026-04-19estimated | ? | ? | 11:22Z | 18:24Z | 7h 01m | N2140U |
| 2026-04-13partial | KORD | ? | 14:30 CDT | N61881 | ||
| 2026-04-06 | KDEN | KPHX | 05:52 MDT | 06:38 MST | 1h 45m | N31412 |
| 2026-04-04estimated | KIAH | KSFO | 06:06 CDT | 11:01 PDT | 6h 55m | N78448 |
| 2026-03-31estimated | ? | ? | 00:00Z | 03:34Z | 3h 34m | N213UA |
| 2026-03-30estimated | ? | ? | 21:21Z | 23:58Z | 2h 36m | N213UA |
| 2026-03-28estimated | ? | ? | 20:53Z | 22:10Z | 1h 16m | N839UA |
| 2025-09-29 | KIAD Washington Dulles International | KHUF | 00:49 EDT | 01:52 EDT | 1h 02m | A1FCC5 |
| 2025-09-24 | KSFO San Francisco International | ? | 08:31 PDT | 16:36Z | 1h 05m | A48DEA |
| 2025-09-23 | KEWR Newark Liberty International | ? | 00:08 EDT | 05:16Z | 1h 07m | A8DEDA |
Times are local to each airport. Hover for UTC. Flights marked estimated were completed with route prediction or partial coverage; partial records have a confirmed departure but no reliable arrival fix.
Data access
Live positions and 365-day history for this flight are available through the PlaneTrack API (commercial use from $29/month) and as one-off CSV extracts from our own receiver network archive. Questions: [email protected]