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
18:23 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
125 ft
Coordinates
33.9425, -118.4080

cloud Weather

Wind
240° / 15 kt
Visibility
10 SM
Ceiling
FEW 2,000 ft, SCT 3,200 ft, SCT 6,000 ft
Temp / Dew
18°C / 13°C
Altimeter
30.00 inHg

Obs: 2026-05-30T00:53:00.000Z

Raw METAR / TAF 
METAR KLAX 300053Z 24015KT 10SM FEW020 SCT032 SCT060 18/13 A3000 RMK AO2 SLP156 T01830128 $

TAF KLAX 292329Z 3000/3106 26014G22KT P6SM SKC FM300200 26010KT P6SM SKC FM300500 VRB03KT P6SM SKC FM300900 VRB03KT P6SM OVC010 FM301700 24006KT P6SM SCT015 FM301800 26012KT P6SM SKC FM310400 VRB03KT P6SM SKC

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 360 Departures
flight_land 387 Arrivals

Arrival

SFO KSFO MVFR

San Francisco International Airport

San Francisco, US

Local time
18:23 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
13 ft
Coordinates
37.6198, -122.3748

cloud Weather

Wind
270° / 14G20 kt
Visibility
10 SM
Ceiling
FEW 400 ft, BKN 1,800 ft, BKN 3,700 ft
Temp / Dew
16°C / 11°C
Altimeter
30.08 inHg

Obs: 2026-05-30T00:56:00.000Z

Raw METAR / TAF 
METAR KSFO 300056Z 27014G20KT 10SM FEW004 BKN018 BKN037 16/11 A3008 RMK AO2 SLP186 T01560111

TAF KSFO 292320Z 3000/3106 27012KT P6SM BKN025 FM300400 26010KT P6SM OVC010 FM300900 26005KT P6SM BKN015 FM301700 29010KT P6SM SKC FM302000 28018KT P6SM SKC

warning FAA Advisories

  • Ground Delay: low ceilings (avg 1 hour and 5 minutes)

flight Live Traffic

flight_takeoff 274 Departures
flight_land 287 Arrivals

Recent history last 12

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
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
2026-05-07 A8AFEC LAX → SFO May 7, 17:40 UTCMay 7, 17:50 UTC10m - -
2026-05-05 AA7F28 LAX → SFO May 5, 01:05 UTCMay 5, 01:35 UTC30m - -
2026-04-20 A12F70 LAX → SFO Apr 20, 23:20 UTCApr 21, 03:20 UTC4h 0m - -
2026-04-17 A94B0B LAX → LAS Apr 17, 15:22 UTCApr 17, 16:37 UTC1h 15m +22m -34m

Performance history

Flights tracked
12
Avg arrival delay
-4m
On-time arrival
75% 75% on time
Aircraft used
8

Monthly activity 2 months

Month Flights tracked
May 2026 10
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 25m 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 12 flights under this callsign.
Is flight UAL3939 usually on time?
Across recent flights, UAL3939 arrives 4 minutes early on average. 75% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3939?
UAL3939 has been operated by 8 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.