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 86 flights since Aug 2025
| Date | From | To | Dep | Arr | Duration | Aircraft |
|---|---|---|---|---|---|---|
| 2026-10-06 | KIAD WASHINGTON DULLES INTERNATIONAL | KMCO ORLANDO INTERNATIONAL | 09:17 EDT | 11:14 EDT | 1h 57m | N38454 |
| 2026-10-04 | KIAD WASHINGTON DULLES INTERNATIONAL | MDSD LAS AMERICAS INTERNATIONAL | 06:27 EDT | 09:28 AST | 3h 01m | N77573 |
| 2026-10-01 | KIAH GEORGE BUSH INTCNTL HOUSTON | KMSY LOUIS ARMSTRONG NEW ORLEANS INTERNATIONAL | 17:20 CDT | 18:05 CDT | 0h 45m | N459UA |
| 2026-09-29estimated | EGLL | KEWR | 01:00 BST | 22:58 EDT | 2h 58m | N37324 |
| 2026-09-28estimated | KAUS | ? | 18:06 CDT | 23:58Z | 0h 51m | N37324 |
| 2026-09-23 | KIAH | KIAD | 09:19 CDT | 13:02 EDT | 2h 42m | N21108 |
| 2026-09-21 | KCMH | KSAV | 18:07 EDT | 19:22 EDT | 1h 14m | N804UA |
| 2026-09-16estimated | KSFO | KIAH | 08:08 PDT | 12:42 CDT | 2h 33m | N26208 |
| 2026-09-07partial | KORD | ? | 12:52 CDT | N39415 |
Earlier flights (77) - back to 2025-08-15
| Date | From | To | Dep | Arr | Duration | Aircraft |
|---|---|---|---|---|---|---|
| 2026-09-01estimated | KIAD | ? | 13:35 EDT | 18:26Z | 0h 51m | N796UA |
| 2026-08-25 | EGLL | KEWR | 15:30 BST | 17:48 EDT | 7h 17m | N76062 |
| 2026-08-23estimated | KSAN | ? | 21:42 PDT | 05:55Z | 1h 12m | N67815 |
| 2026-08-21estimated | ? | KSAN | 14:13Z | 07:58 PDT | 0h 44m | N37474 |
| 2026-08-17estimated | ? | ? | 01:39Z | 11:22Z | 9h 42m | N29907 |
| 2026-08-14estimated | ? | ? | 00:11Z | 17:02Z | 16h 50m | N75858 |
| 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 |
| 2026-07-04estimated | KPIT | KORD | 09:45 EDT | 09:46 CDT | 1h 00m | N12238 |
| 2026-07-01 | KMCO | KEWR | 03:12 EDT | 05:20 EDT | 2h 07m | A126E7 |
| 2026-06-28estimated | KSFO | KIAH | 10:19 PDT | 15:50 CDT | 3h 30m | N796UA |
| 2026-06-26estimated | KSJC | KSFO | 17:00 PDT | 18:18 PDT | 1h 18m | N684UA |
| 2026-06-25estimated | KEWR | KIAH | 14:31 EDT | 18:58 CDT | 5h 26m | N684UA |
| 2026-06-20estimated | KEWR | KIAH | 12:05 EDT | 14:44 CDT | 3h 38m | N217UA |
| 2026-06-15 | KORD | KLGA | 05:37 CDT | 08:10 EDT | 1h 32m | A0B7B7 |
| 2026-06-13estimated | KEWR | KCLT | 05:13 EDT | 06:46 EDT | 1h 32m | AA7F23 |
| 2026-06-12estimated | KIAH | KSFO | 07:26 CDT | 08:54 PDT | 3h 27m | N29971 |
| 2026-05-29estimated | KLAX | ? | 07:14 PDT | 17:00Z | 2h 45m | A0B7BD |
| 2026-05-26estimated | KEWR | KIAD | 11:46 EDT | 18:12 EDT | 6h 25m | N19136 |
| 2026-05-26estimated | EGPH | KIAD | 15:11 BST | 11:00 EDT | 0h 48m | 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 | 15:42 EDT | 4h 46m | N18119 |
| 2026-05-06 | KIAD | KORD | 07:23 EDT | 07:58 CDT | 1h 34m | N27903 |
| 2026-05-03estimated | KBED | KIAD | 20:00 EDT | 21:18 EDT | 1h 17m | N648UA |
| 2026-05-02 | LEBL | ? | 18:23 CEST | 23:58Z | 7h 35m | N648UA |
| 2026-04-27 | KORD | KDEN | 05:01 CDT | 06:38 MDT | 2h 36m | A0B889 |
| 2026-04-19estimated | ? | ? | 11:22Z | 16:20Z | 4h 57m | 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 | ? | KSFO | 20:53Z | 15:10 PDT | 1h 16m | N839UA |
| 2026-03-05 | KPHX | KLAX | 23:06 MST | 23:24 PST | 1h 17m | N67846 |
| 2026-03-03 | KLGA | KIAH | 07:51 EST | 10:36 CST | 3h 44m | N77538 |
| 2026-02-28 | KORD | KATL | 06:33 CST | 09:06 EST | 1h 32m | N873UA |
| 2026-02-26estimated | KSFO | KIAH | 03:47 PST | 07:36 CST | 1h 49m | N472UA |
| 2026-02-25 | KIAD | KEWR | 11:51 EST | 13:06 EST | 1h 14m | N797UA |
| 2026-02-22 | KEWR | KIAH | 21:37 EST | 00:18 CST | 3h 40m | N849UA |
| 2026-02-20 | KORD | KDEN | 10:06 CST | 11:16 MST | 2h 10m | N213UA |
| 2026-02-18 | KORD | KGSO | 18:53 CST | 21:02 EST | 1h 08m | N476UA |
| 2026-02-14 | KBUR | KSFO | 07:17 PST | 08:36 PST | 1h 19m | N466UA |
| 2026-02-11 | KATL | KIAH | 10:09 EST | 16:44 CST | 7h 35m | N832UA |
| 2026-02-05estimated | ? | KIAD | 15:00Z | 11:22 EST | 1h 21m | A0B7DC |
| 2026-01-27 | KEWR | CYYZ | 13:21 EST | 14:54 EST | 1h 32m | N830UA |
| 2026-01-27 | KBOS | KEWR | 21:12 EST | 23:08 EST | 1h 55m | N17262 |
| 2026-01-27estimated | KBOS | ? | 19:58 EST | 01:50Z | 0h 52m | N17262 |
| 2026-01-26 | KDEN | KIAH | 17:36 MST | 20:50 CST | 2h 14m | N849UA |
| 2026-01-25 | KEWR | KTPA | 21:41 EST | 00:30 EST | 2h 48m | N47414 |
| 2026-01-22 | KDEN | KBFI | 05:27 MST | 07:32 PST | 3h 04m | N477UA |
| 2025-12-31 | KBOS | KEWR | 01:07 EST | 02:08 EST | 1h 00m | N670UA |
| 2025-12-29estimated | EGLL | KEWR | 00:00 GMT | 20:34 EST | 1h 33m | N13750 |
| 2025-12-28estimated | KIAD | ? | 18:31 EST | 23:58Z | 0h 27m | N13750 |
| 2025-12-27 | CYYC | KDEN | 12:29 MST | 15:28 MST | 2h 58m | N37274 |
| 2025-12-27partial | CYYC | ? | 11:07 MST | N37274 | ||
| 2025-12-26 | KEWR | KIAD | 09:59 EST | 11:30 EST | 1h 31m | N842UA |
| 2025-12-24estimated | KSFO | KIAH | 09:16 PST | 14:58 CST | 3h 42m | N39415 |
| 2025-12-21estimated | ? | KDEN | 14:45Z | 08:24 MST | 0h 38m | N806UA |
| 2025-12-19 | KEWR | KIAD | 22:47 EST | 23:44 EST | 0h 56m | N66056 |
| 2025-12-16 | KDEN | KMCO | 15:04 MST | 20:04 EST | 3h 00m | A12F4C |
| 2025-12-15 | VHHH | KSFO | 13:28 HKT | 09:28 PST | 11h 59m | N798UA |
| 2025-12-14partial | KORD | ? | 20:03 CST | N830UA | ||
| 2025-11-26estimated | EGLL | KEWR | 12:20 GMT | 08:40 EST | 1h 20m | N668UA |
| 2025-10-26 | KIAH | KIAD | 20:48 CDT | 00:04 EDT | 2h 15m | N216UA |
| 2025-10-15 | KAUS | KIAH | 09:46 CDT | 10:46 CDT | 0h 59m | N69833 |
| 2025-10-13estimated | RPLL | ? | 02:07 PST | 18:36Z | 0h 28m | N77261 |
| 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 |
| 2025-08-19 | KLAX | KDEN | 08:04 PDT | 12:12 MDT | 3h 07m | N78866 |
| 2025-08-16 | EGLL | EIDW | 14:43 BST | 15:46 IST | 1h 02m | N669UA |
| 2025-08-15estimated | KSJC | KSFO | 17:49 PDT | 20:52 PDT | 3h 03m | N47280 |
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.
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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 archive (from $9.99, with a free one-day sample). Questions: [email protected]