Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL3873

Operated by United Airlines

Live map

Live map filtered to UAL3873. Shown when the flight is currently airborne.

Route airports View route page →

Departure

SEA KSEA VFR

Seattle–Tacoma International Airport

Seattle, US

Local time
00:22 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
433 ft
Coordinates
47.4479, -122.3103

cloud Weather

Wind
200° / 3 kt
Visibility
10 SM
Ceiling
SCT 7,000 ft, BKN 23,000 ft
Temp / Dew
16°C / 12°C
Altimeter
30.09 inHg

Obs: 2026-08-28T06:53:00.000Z

Raw METAR / TAF 
METAR KSEA 280653Z 20003KT 10SM SCT070 BKN230 16/12 A3009 RMK AO2 SLP192 T01610122

TAF KSEA 280520Z 2806/2912 21006KT P6SM SCT040 BKN080 FM281000 19005KT P6SM BKN022 FM281300 18003KT P6SM OVC012 FM281900 22005KT P6SM BKN025 OVC050 FM282100 24006KT P6SM BKN050 FM290200 30006KT P6SM BKN050 FM290800 19007KT P6SM -SHRA OVC025

flight Live Traffic

flight_takeoff 596 Departures
flight_land 597 Arrivals

Arrival

DEN KDEN VFR

Denver International Airport

Denver, US

Local time
01:22 MDT
Timezone
America/Denver
Type
Large Airport
Elevation
5,431 ft
Coordinates
39.8600, -104.6738

cloud Weather

Wind
160° / 9 kt
Visibility
10 SM
Ceiling
FEW 12,000 ft, FEW 22,000 ft
Temp / Dew
18°C / 9°C
Altimeter
30.18 inHg

Obs: 2026-08-28T06:53:00.000Z

Raw METAR / TAF 
METAR KDEN 280653Z 16009KT 10SM FEW120 FEW220 18/09 A3018 RMK AO2 SLP133 T01830094 403330156

TAF KDEN 280536Z 2806/2912 18011KT P6SM FEW100 FEW150 FM281100 23011KT P6SM FEW120 FM281600 VRB06KT P6SM FEW120 FM282100 02008KT P6SM FEW100 SCT120 PROB30 2821/2902 VRB15G25KT -SHRA BKN080 FM290200 VRB06KT P6SM SCT120 BKN220 FM290500 22009KT P6SM FEW120 SCT220

flight Live Traffic

flight_takeoff 143 Departures
flight_land 156 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-26 AA5690 SEA → DEN Jul 26, 04:10 UTCJul 26, 05:05 UTC55m - -
2026-07-20 A5D2F9 SEA → DEN Jul 20, 19:15 UTCJul 20, 20:20 UTC1h 5m - -
2026-07-17 A8E24D SEA → DEN Jul 17, 22:25 UTCJul 18, 00:45 UTC2h 20m - -
2026-07-17 A8E24D SEA → DEN Jul 17, 22:17 UTCJul 18, 00:44 UTC2h 27m +437m +24m
2026-07-12 A6EDC3 - Jul 12, 16:15 UTCJul 12, 18:15 UTC2h 0m - -
2026-07-12 A6EDC3 MLB → IAH Jul 12, 16:08 UTCJul 12, 18:13 UTC2h 5m +8m -6m
2026-07-10 A3D2E5 - Jul 10, 06:10 UTCJul 10, 08:05 UTC1h 55m - -
2026-07-10 A3D2E5 MLB → IAH Jul 10, 06:08 UTCJul 10, 08:03 UTC1h 55m +53m -9m
2026-06-30 A0B844 ORD → MLB Jun 30, 10:20 UTCJun 30, 12:11 UTC1h 51m +20m +5m
2026-06-30 A0B844 ORD → MLB Jun 30, 10:00 UTCJun 30, 12:15 UTC2h 15m - -
2026-06-27 A0B86A SEA → DEN Jun 27, 01:54 UTCJun 27, 03:49 UTC1h 55m - -
2026-06-27 A0B86A SEA → DEN Jun 27, 01:50 UTCJun 27, 03:45 UTC1h 55m +20m +2m
2026-06-19 A91535 SEA → DEN Jun 19, 03:34 UTCJun 19, 07:19 UTC3h 45m - -
2026-06-19 A91535 SEA → DEN Jun 19, 03:17 UTCJun 19, 07:19 UTC4h 2m +37m -34m
2026-06-13 A2F200 SEA → DEN Jun 13, 16:04 UTCJun 14, 05:20 UTC13h 16m +34m -5m
2026-06-13 A2F200 SEA → DEN Jun 13, 16:20 UTCJun 14, 03:20 UTC11h 0m - -
2026-06-06 A0B88B SEA → DEN Jun 6, 11:39 UTCJun 6, 13:44 UTC2h 5m - -
2026-06-04 A3D2E5 SEA → DEN Jun 4, 05:33 UTCJun 4, 07:19 UTC1h 46m +8m -30m
2026-06-04 A3D2E5 SEA → DEN Jun 4, 05:05 UTCJun 4, 07:25 UTC2h 20m - -
2026-06-02 A2452A SEA → DEN Jun 2, 04:00 UTCJun 2, 06:05 UTC2h 5m - -
2026-05-29 A3A0ED SEA → DEN May 29, 19:55 UTCMay 29, 21:00 UTC1h 5m - -
2026-05-23 A5E095 SEA → DEN May 23, 04:20 UTCMay 23, 07:20 UTC3h 0m - -
2026-05-18 AC0831 SEA → DEN May 18, 22:55 UTCMay 18, 23:25 UTC30m - -
2026-05-15 A5E095 SEA → DEN May 15, 19:15 UTCMay 15, 19:55 UTC40m - -
2026-05-15 A5E095 SEA → DEN May 15, 00:38 UTCMay 15, 03:51 UTC3h 13m +8m +6m
2026-05-15 A5E095 SEA → DEN May 15, 00:35 UTCMay 15, 03:55 UTC3h 20m - -
2026-05-11 AB97E6 SEA → DEN May 11, 13:50 UTCMay 11, 15:00 UTC1h 10m - -
2026-05-11 AB97E6 SEA → DEN May 11, 13:45 UTCMay 11, 15:05 UTC1h 20m +45m +3m
2026-05-08 AA56B8 SEA → DEN May 8, 03:35 UTCMay 8, 05:49 UTC2h 15m - -
2026-05-08 AA56B8 SEA → DEN May 8, 03:44 UTCMay 8, 05:51 UTC2h 7m +104m -4m

Performance history

Flights tracked
37 showing last 30
Avg arrival delay
-4m
On-time arrival
91% 91% on time
Aircraft used
16

Monthly activity 4 months

Month Flights tracked
July 2026 8
June 2026 12
May 2026 11
April 2026 6

UAL3873 frequently asked

Where does flight UAL3873 fly?
UAL3873 (United Airlines) flies from SEA to DEN. View the full route page.
How long is flight UAL3873?
Based on observed flights, UAL3873 takes on average 2h 43m from takeoff to landing.
How often does UAL3873 fly?
UAL3873 has been observed flying several times a week in our tracking data. We've recorded 37 flights under this callsign.
Is flight UAL3873 usually on time?
Across recent flights, UAL3873 arrives 4 minutes early on average. 91% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3873?
UAL3873 has been operated by 16 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL3873 live?
Yes. When UAL3873 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.