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
16:07 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
125 ft
Coordinates
33.9425, -118.4080

cloud Weather

Wind
230° / 12 kt
Visibility
10 SM
Ceiling
FEW 6,000 ft, SCT 8,000 ft
Temp / Dew
20°C / 9°C
Altimeter
29.89 inHg

Obs: 2026-10-12T22:53:00.000Z

Raw METAR / TAF 
METAR KLAX 122253Z 23012KT 10SM FEW060 SCT080 20/09 A2989 RMK AO2 SLP120 T02000094 $

TAF KLAX 121745Z 1218/1324 VRB03KT P6SM SCT035 FM122100 26012KT P6SM SCT050 FM130600 23005KT P6SM SKC FM130800 VRB03KT P6SM SKC FM132100 25008KT P6SM SCT250

warning FAA Advisories

  • Closed: !LAX 05/277 LAX AD AP CLSD TO NON SKED TRANSIENT GA ACFT EXC 24HR PPR CTC ATLANTIC AVIATION 310-258-9884 OR SIGNATURE AVIATION 310-410-9605 2605271826-2705281600 (May 27 at 18:26 UTC. – May 28 at 16:00 UTC.)

flight Live Traffic

flight_takeoff 366 Departures
flight_land 319 Arrivals

Arrival

SFO KSFO VFR

San Francisco International Airport

San Francisco, US

Local time
16:07 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
13 ft
Coordinates
37.6198, -122.3748

cloud Weather

Wind
280° / 9 kt
Visibility
10 SM
Ceiling
FEW 2,600 ft
Temp / Dew
19°C / 8°C
Altimeter
29.90 inHg

Obs: 2026-10-12T22:56:00.000Z

Raw METAR / TAF 
METAR KSFO 122256Z 28009KT 10SM FEW026 19/08 A2990 RMK AO2 SLP124 T01940083 $

TAF KSFO 122057Z 1221/1324 28012KT P6SM SKC FM130300 28006KT P6SM SKC FM131400 08004KT P6SM SKC FM132000 32011KT P6SM SKC

flight Live Traffic

flight_takeoff 262 Departures
flight_land 245 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.