Flight
UAL3821
Flight history and live tracking for UAL3821, 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 | KPDX → KBFI |
Flight history 3 flights since May 2026
| Date | From | To | Dep | Arr | Duration | Aircraft |
|---|---|---|---|---|---|---|
| 2026-09-08partial | KSEA | ? | 14:21 PDT | A12B76 |
Earlier flights (2) - back to 2026-05-19
| Date | From | To | Dep | Arr | Duration | Aircraft |
|---|---|---|---|---|---|---|
| 2026-07-07 | KPDX | KBFI | 13:29 PDT | 14:02 PDT | 0h 33m | A12B4D |
| 2026-05-19 | KSFO | KPAE | 06:13 PDT | 06:34 PDT | 0h 20m | N774UA |
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.
Follow this flight
Get an email when UAL3821 flies + if it runs late.
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]