Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL3939

Operated by United Airlines

Live map

Live map filtered to UAL3939. Shown when the flight is currently airborne.

Route airports View route page →

Departure

LAX KLAX VFR

Los Angeles International Airport

Los Angeles, US

Local time
04:53 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
125 ft
Coordinates
33.9425, -118.4080

cloud Weather

Wind
0° / 0 kt
Visibility
10 SM
Ceiling
FEW 800 ft, FEW 14,000 ft, BKN 22,000 ft, BKN 28,000 ft
Temp / Dew
24°C / 21°C
Altimeter
29.83 inHg

Obs: 2026-08-28T10:53:00.000Z

Raw METAR / TAF 
METAR KLAX 281053Z 00000KT 10SM FEW008 FEW140 BKN220 BKN280 24/21 A2983 RMK AO2 SLP099 T02390206 $

TAF KLAX 281120Z 2812/2918 VRB03KT P6SM BKN150 FM281700 26006KT P6SM BKN150 FM281900 26012KT P6SM BKN150 FM290300 26006KT P6SM SCT250

flight Live Traffic

flight_takeoff 234 Departures
flight_land 234 Arrivals

Arrival

SFO KSFO VFR

San Francisco International Airport

San Francisco, US

Local time
04:53 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
13 ft
Coordinates
37.6198, -122.3748

cloud Weather

Wind
310° / 10 kt
Visibility
10 SM
Ceiling
FEW 400 ft, BKN 20,000 ft
Temp / Dew
15°C / 13°C
Altimeter
29.93 inHg

Obs: 2026-08-28T10:56:00.000Z

Raw METAR / TAF 
METAR KSFO 281056Z 31010KT 10SM FEW004 BKN200 15/13 A2993 RMK AO2 SLP134 T01500133 $

TAF KSFO 281126Z 2812/2918 31010KT P6SM FEW004 BKN200 FM281500 28006KT P6SM VCSH OVC050 FM282100 28016KT P6SM OVC100 FM291000 27011KT P6SM SCT010

flight Live Traffic

flight_takeoff 194 Departures
flight_land 119 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-25 A12AE3 LAX → SFO Jul 25, 03:40 UTCJul 25, 06:00 UTC2h 20m - -
2026-07-25 A12AE3 LAX → SFO Jul 25, 03:35 UTCJul 25, 07:07 UTC3h 32m +155m -11m
2026-07-22 A1270F LAX → SFO Jul 22, 14:05 UTCJul 22, 14:25 UTC20m - -
2026-07-21 AA44AD LAX → SFO Jul 21, 11:35 UTCJul 21, 12:15 UTC40m - -
2026-07-18 A5D570 LAX → SFO Jul 18, 13:30 UTCJul 18, 14:00 UTC30m - -
2026-07-11 A57B4D ATL → IAD Jul 11, 05:55 UTCJul 11, 07:20 UTC1h 25m - -
2026-07-11 A57B4D ATL → IAD Jul 11, 05:45 UTCJul 11, 07:13 UTC1h 28m +30m -20m
2026-07-04 AA93C9 IAD → EWR Jul 4, 04:40 UTCJul 4, 05:25 UTC45m - -
2026-07-04 AA93C9 IAD → EWR Jul 4, 03:47 UTCJul 4, 05:23 UTC1h 36m +17m +11m
2026-06-30 A14B1A - Jun 30, 19:15 UTCJun 30, 22:40 UTC3h 25m - -
2026-06-30 A14B1A PDX → ORD Jun 30, 18:41 UTCJun 30, 22:35 UTC3h 54m +371m -4m
2026-06-21 A46CE1 LAX → SFO Jun 21, 19:14 UTCJun 21, 20:05 UTC50m - -
2026-06-19 AA92FF LAX → SFO Jun 19, 14:44 UTCJun 19, 17:09 UTC2h 25m - -
2026-06-19 AA92FF LAX → SFO Jun 19, 14:21 UTCJun 19, 17:06 UTC2h 45m +141m -14m
2026-06-17 A1D8FD LAX → SFO Jun 17, 10:35 UTCJun 17, 10:50 UTC15m - -
2026-06-17 A1D8FD LAX → SFO Jun 17, 08:45 UTCJun 17, 09:30 UTC45m - -
2026-06-16 AA9B82 LAX → SFO Jun 16, 02:45 UTCJun 16, 04:11 UTC1h 26m +45m -6m
2026-06-16 AA9B82 LAX → SFO Jun 16, 02:50 UTCJun 16, 04:30 UTC1h 40m - -
2026-06-12 A94BFF LAX → SFO Jun 12, 11:05 UTCJun 12, 12:00 UTC55m - -
2026-06-12 A22539 LAX → SFO Jun 12, 06:10 UTCJun 12, 08:40 UTC2h 30m - -
2026-06-12 A22539 LAX → SFO Jun 12, 05:11 UTCJun 12, 08:30 UTC3h 19m +11m +8m
2026-05-31 AB97E6 LAX → SFO May 31, 17:40 UTCMay 31, 19:50 UTC2h 10m - -
2026-05-25 AA6B9F LAX → SFO May 25, 13:34 UTCMay 25, 13:44 UTC10m +34m +23m
2026-05-25 AA6B9F LAX → SFO May 25, 13:05 UTCMay 25, 13:15 UTC10m - -
2026-05-24 A0B7D9 LAX → SFO May 24, 03:05 UTCMay 24, 04:55 UTC1h 50m - -
2026-05-21 A44169 LAX → SFO May 21, 08:40 UTCMay 21, 13:01 UTC4h 20m - -
2026-05-13 AA8A26 LAX → SFO May 13, 23:53 UTCMay 14, 01:22 UTC1h 29m +23m +1m
2026-05-13 AA8A26 LAX → SFO May 13, 23:30 UTCMay 13, 23:35 UTC5m - -
2026-05-07 A8AFEC LAX → SFO May 7, 17:55 UTCMay 7, 19:30 UTC1h 35m - -
2026-05-07 A8AFEC LAX → SFO May 7, 17:43 UTCMay 7, 19:12 UTC1h 29m +43m -8m

Performance history

Flights tracked
34 showing last 30
Avg arrival delay
-2m
On-time arrival
90% 90% on time
Aircraft used
19

Monthly activity 4 months

Month Flights tracked
July 2026 9
June 2026 12
May 2026 11
April 2026 2

UAL3939 frequently asked

Where does flight UAL3939 fly?
UAL3939 (United Airlines) flies from LAX to SFO. View the full route page.
How long is flight UAL3939?
Based on observed flights, UAL3939 takes on average 1h 40m from takeoff to landing.
How often does UAL3939 fly?
UAL3939 has been observed flying several times a week in our tracking data. We've recorded 34 flights under this callsign.
Is flight UAL3939 usually on time?
Across recent flights, UAL3939 arrives 2 minutes early on average. 90% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3939?
UAL3939 has been operated by 19 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL3939 live?
Yes. When UAL3939 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.