Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL3821

Live map

Live map filtered to UAL3821. Shown when the flight is currently airborne.

Route airports View route page →

Departure

PDX KPDX VFR

Portland International Airport

Portland, US

Local time
22:32 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
31 ft
Coordinates
45.5887, -122.5980

cloud Weather

Wind
0° / 0 kt
Visibility
10 SM
Ceiling
CLR
Temp / Dew
10°C / 6°C
Altimeter
30.09 inHg

Obs: 2026-10-13T04:53:00.000Z

Raw METAR / TAF 
METAR KPDX 130453Z 00000KT 10SM CLR 10/06 A3009 RMK AO2 SLP188 T01000056 $

TAF KPDX 130525Z 1306/1406 VRB05KT P6SM SKC FM131400 VRB03KT P6SM SCT005

flight Live Traffic

flight_takeoff 150 Departures
flight_land 145 Arrivals

Arrival

BFI KBFI VFR

King County International Airport - Boeing Field

Seattle, US

Local time
22:32 PDT
Timezone
America/Los_Angeles
Type
Medium Airport
Elevation
21 ft
Coordinates
47.5270, -122.2999

cloud Weather

Wind
0° / 0 kt
Visibility
10 SM
Ceiling
CLR
Temp / Dew
9°C / 5°C
Altimeter
30.09 inHg

Obs: 2026-10-13T04:53:00.000Z

Raw METAR / TAF 
METAR KBFI 130453Z 00000KT 10SM CLR 09/05 A3009 RMK AO2 SLP188 T00940050

TAF KBFI 130520Z 1306/1406 00000KT P6SM SCT250 FM131000 15004KT P6SM OVC100 FM131800 18004KT P6SM OVC100 FM140400 VRB03KT P6SM SCT025 OVC040

flight Live Traffic

flight_takeoff 20 Departures
flight_land 17 Arrivals

Recent history last 5

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-07 A12B4D PDX → BFI Jul 7, 20:40 UTCJul 7, 21:28 UTC48m +40m +59m
2026-07-07 A12B4D PDX → BFI Jul 7, 20:30 UTCJul 7, 21:05 UTC35m - -
2026-06-02 AC0831 SEA → PAE Jun 2, 20:40 UTCJun 2, 21:10 UTC30m - -
2026-05-14 AA79A6 SEA → PAE May 14, 22:03 UTCMay 14, 23:56 UTC1h 53m +23m +7m
2026-05-14 AA79A6 SEA → PAE May 14, 22:15 UTCMay 14, 23:30 UTC1h 15m - -

Performance history

Flights tracked
5
Avg arrival delay
+33m
On-time arrival
50% 50% on time
Aircraft used
3

Monthly activity 3 months

Month Flights tracked
July 2026 2
June 2026 1
May 2026 2

UAL3821 frequently asked

Where does flight UAL3821 fly?
UAL3821 flies from PDX to BFI. View the full route page.
How long is flight UAL3821?
Based on observed flights, UAL3821 takes on average 1h 0m from takeoff to landing.
How often does UAL3821 fly?
UAL3821 has been observed flying occasionally in our tracking data. We've recorded 5 flights under this callsign.
Is flight UAL3821 usually on time?
Across recent flights, UAL3821 arrives with an average 33-minute delay. 50% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3821?
UAL3821 has been operated by 3 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL3821 live?
Yes. When UAL3821 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.