Apparatus

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flight_takeoff Flight

UAL3900

Operated by United Airlines

Live map

Live map filtered to UAL3900. Shown when the flight is currently airborne.

Route airports View route page →

Departure

SJC KSJC VFR

Norman Y. Mineta San Jose International Airport

San Jose, US

Local time
17:48 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
62 ft
Coordinates
37.3625, -121.9292

cloud Weather

Wind
340° / 15 kt
Visibility
10 SM
Ceiling
SCT 3,500 ft, BKN 4,500 ft, BKN 5,000 ft
Temp / Dew
19°C / 11°C
Altimeter
30.06 inHg

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

Raw METAR / TAF 
METAR KSJC 292353Z 34015KT 10SM SCT035 BKN045 BKN050 19/11 A3006 RMK AO2 SLP178 T01890111 10206 20178 51000

TAF KSJC 292320Z 3000/3024 33012KT P6SM BKN040 FM300500 32006KT P6SM BKN025 FM301900 33010KT P6SM SKC

flight Live Traffic

flight_takeoff 86 Departures
flight_land 63 Arrivals

Arrival

DEN KDEN VFR

Denver International Airport

Denver, US

Local time
18:48 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 10

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-05-26 A12F6F SJC → DEN May 26, 03:55 UTCMay 26, 04:50 UTC55m - -
2026-05-16 A1B5E7 SJC → DEN May 16, 00:40 UTCMay 16, 00:55 UTC15m - -
2026-05-15 A1B5E7 SJC → DEN May 15, 15:15 UTCMay 16, 00:55 UTC9h 40m - -
2026-05-15 A1B5E7 SJC → DEN May 15, 14:20 UTCMay 15, 14:30 UTC10m - -
2026-05-15 A1B5E7 SJC → DEN May 15, 13:45 UTCMay 16, 00:23 UTC10h 38m +15m +9m
2026-05-08 A89D59 SJC → DEN May 8, 14:25 UTCMay 8, 15:05 UTC40m - -
2026-05-05 AA6B9F SJC → DEN May 5, 16:50 UTCMay 5, 20:01 UTC3h 10m - -
2026-05-03 A3C3E6 SJC → DEN May 3, 15:55 UTCMay 3, 19:25 UTC3h 30m - -
2026-05-03 A3C3E6 SJC → DEN May 3, 15:16 UTCMay 3, 18:59 UTC3h 43m +16m -51m
2026-04-28 A836FB SJC → DEN Apr 28, 13:20 UTCApr 28, 15:05 UTC1h 45m - -

Performance history

Flights tracked
10
Avg arrival delay
-21m
On-time arrival
100% 100% on time
Aircraft used
6

Monthly activity 2 months

Month Flights tracked
May 2026 9
April 2026 1

UAL3900 frequently asked

Where does flight UAL3900 fly?
UAL3900 (United Airlines) flies from SJC to DEN. View the full route page.
How long is flight UAL3900?
Based on observed flights, UAL3900 takes on average 3h 27m from takeoff to landing.
How often does UAL3900 fly?
UAL3900 has been observed flying several times a week in our tracking data. We've recorded 10 flights under this callsign.
Is flight UAL3900 usually on time?
Across recent flights, UAL3900 arrives 21 minutes early on average. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3900?
UAL3900 has been operated by 6 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL3900 live?
Yes. When UAL3900 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.