Apparatus

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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
17:51 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
433 ft
Coordinates
47.4479, -122.3103

cloud Weather

Wind
280° / 3 kt
Visibility
10 SM
Ceiling
FEW 2,500 ft, FEW 3,500 ft, BKN 6,500 ft
Temp / Dew
15°C / 8°C
Altimeter
30.08 inHg

Obs: 2026-05-29T23:53:00.000Z

Raw METAR / TAF 
METAR KSEA 292353Z 28003KT 10SM FEW025 FEW035 BKN065 15/08 A3008 RMK AO2 SLP192 60002 T01500078 10156 20089 51007 $

TAF KSEA 292339Z 3000/3106 03005KT P6SM FEW020 BKN035 FM300300 03010KT P6SM BKN050 FM301200 10005KT P6SM BKN030 FM301900 28006KT P6SM BKN070

flight Live Traffic

flight_takeoff 230 Departures
flight_land 268 Arrivals

Arrival

DEN KDEN VFR

Denver International Airport

Denver, US

Local time
18:51 MDT
Timezone
America/Denver
Type
Large Airport
Elevation
5,431 ft
Coordinates
39.8600, -104.6738

cloud Weather

Wind
330° / 9 kt
Visibility
10 SM
Ceiling
FEW 7,000 ft, SCT 11,000 ft, BKN 15,000 ft
Temp / Dew
21°C / 6°C
Altimeter
29.80 inHg

Obs: 2026-05-29T23:53:00.000Z

Raw METAR / TAF 
METAR KDEN 292353Z 33009KT 10SM FEW070 SCT110 BKN150 21/06 A2980 RMK AO2 WSHFT 2308 SLP020 60000 T02110056 10283 20211 58005

TAF KDEN 300002Z 3000/3106 32010KT P6SM VCSH SCT070 BKN110 BKN150 FM300200 03010KT P6SM SCT100 BKN150 FM300600 32007KT P6SM FEW100 SCT200 FM300900 25006KT P6SM FEW100 SCT200 FM301400 28009KT P6SM SCT180 FM302100 31012KT P6SM VCSH SCT100 PROB30 3021/3101 VRB15G25KT FM310300 27013KT P6SM FEW080 SCT100

warning FAA Advisories

  • Ground Delay: thunderstorms (avg 59 minutes)

flight Live Traffic

flight_takeoff 440 Departures
flight_land 521 Arrivals

Recent history last 17

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
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
2026-05-05 A44585 SEA → DEN May 5, 12:10 UTCMay 5, 12:55 UTC45m - -
2026-04-30 A55B3C SEA → DEN Apr 30, 02:00 UTCApr 30, 03:35 UTC1h 35m - -
2026-04-30 A55B3C SEA → DEN Apr 30, 01:43 UTCApr 30, 03:42 UTC1h 59m +28m -2m
2026-04-28 A923CF SEA → DEN Apr 28, 02:30 UTCApr 28, 03:45 UTC1h 15m - -
2026-04-28 A923CF SEA → DEN Apr 28, 02:36 UTCApr 28, 03:48 UTC1h 12m +36m -8m
2026-04-24 A0B7DC SEA → DEN Apr 24, 19:08 UTCApr 24, 20:45 UTC1h 37m +868m -18m
2026-04-24 A94B2E SEA → DEN Apr 24, 15:10 UTCApr 24, 16:35 UTC1h 25m - -

Performance history

Flights tracked
17
Avg arrival delay
-4m
On-time arrival
100% 100% on time
Aircraft used
10

Monthly activity 2 months

Month Flights tracked
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 1h 40m 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 17 flights under this callsign.
Is flight UAL3873 usually on time?
Across recent flights, UAL3873 arrives 4 minutes early on average. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3873?
UAL3873 has been operated by 10 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.