Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL939

Operated by United Airlines

Live map

Live map filtered to UAL939. Shown when the flight is currently airborne.

Route airports View route page →

Departure

LHR EGLL VFR

London Heathrow Airport

London, GB

Local time
01:45 GMT+1
Timezone
Europe/London
Type
Large Airport
Elevation
83 ft
Coordinates
51.4707, -0.4599

cloud Weather

Wind
240° / 9 kt
Visibility
6 SM
Ceiling
FEW 2,700 ft
Temp / Dew
18°C / 15°C
Altimeter
29.76 inHg

Obs: 2026-08-29T00:20:00.000Z

Raw METAR / TAF 
METAR EGLL 290020Z AUTO 24009KT 9999 FEW027 18/15 Q1008

TAF EGLL 282254Z 2900/3006 22006KT 9999 SCT020 TEMPO 2900/2908 BKN010 PROB30 TEMPO 2903/2906 7000 SHRA BKN008 TEMPO 2907/2913 7000 RA BKN012 BECMG 2909/2911 16010KT PROB40 TEMPO 2909/2913 4000 +RA +SHRA BKN009 BECMG 2912/2914 23010KT TEMPO 2913/2921 7000 SHRA PROB30 TEMPO 2913/2920 3000 +TSRA BKN009 BKN014CB PROB30 TEMPO 3000/3006 6000 -RADZ BKN010

flight Live Traffic

flight_takeoff 42 Departures
flight_land 50 Arrivals

Arrival

SFO KSFO VFR

San Francisco International Airport

San Francisco, US

Local time
17:45 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
13 ft
Coordinates
37.6198, -122.3748

cloud Weather

Wind
260° / 19 kt
Visibility
10 SM
Ceiling
FEW 400 ft, SCT 1,200 ft, BKN 18,000 ft, BKN 20,000 ft
Temp / Dew
17°C / 13°C
Altimeter
29.99 inHg

Obs: 2026-08-28T23:56:00.000Z

Raw METAR / TAF 
METAR KSFO 282356Z 26019KT 10SM FEW004 SCT012 BKN180 BKN200 17/13 A2999 RMK AO2 PK WND 26026/2316 SLP155 T01720128 10183 20161 56014 $

TAF KSFO 282335Z 2900/3006 28016KT P6SM VCSH FEW012 BKN150 FM290300 28014KT P6SM FEW012 TEMPO 2904/2908 BKN012 FM290800 29008KT P6SM OVC012 FM291800 29015G25KT P6SM FEW015 FM300400 27015KT P6SM SCT010

flight Live Traffic

flight_takeoff 180 Departures
flight_land 164 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-26 A7F4E7 LHR → SFO Jul 26, 15:40 UTCJul 26, 21:45 UTC6h 5m - -
2026-07-25 A7F4EC LHR → SFO Jul 25, 17:20 UTCJul 26, 04:00 UTC10h 40m - -
2026-07-24 A1BFAC LHR → SFO Jul 24, 16:10 UTCJul 25, 02:25 UTC10h 15m - -
2026-07-23 A7F4E7 LHR → SFO Jul 23, 15:50 UTCJul 24, 02:15 UTC10h 25m - -
2026-07-23 A7F4E7 LHR → SFO Jul 23, 15:49 UTCJul 24, 02:10 UTC10h 21m +34m +12m
2026-07-22 A6679B LHR → SFO Jul 22, 16:10 UTCJul 23, 02:20 UTC10h 10m - -
2026-07-21 A7F4E9 LHR → SFO Jul 21, 16:00 UTCJul 22, 02:25 UTC10h 25m - -
2026-07-21 A7F4E9 LHR → SFO Jul 21, 15:39 UTCJul 22, 02:19 UTC10h 40m +24m -8m
2026-07-20 AB0F89 LHR → SFO Jul 20, 16:45 UTCJul 21, 03:05 UTC10h 20m - -
2026-07-19 A1BFAC LHR → SFO Jul 19, 15:50 UTCJul 20, 02:15 UTC10h 25m - -
2026-07-18 A7F4EC LHR → SFO Jul 18, 15:45 UTCJul 19, 02:10 UTC10h 25m - -
2026-07-17 A6679B - Jul 17, 15:25 UTCJul 18, 01:34 UTC10h 10m - -
2026-07-16 A7F4E9 - Jul 16, 15:40 UTCJul 16, 16:44 UTC1h 5m - -
2026-07-16 A7F4E9 LHR → SFO Jul 16, 15:39 UTCJul 17, 01:55 UTC10h 16m +24m -6m
2026-07-15 AB0F89 - Jul 15, 15:55 UTCJul 16, 02:35 UTC10h 40m - -
2026-07-14 A7F4EC - Jul 14, 16:00 UTCJul 14, 17:00 UTC1h 0m - -
2026-07-14 A7F4EC LHR → SFO Jul 14, 15:54 UTCJul 15, 02:31 UTC10h 37m +39m +1m
2026-07-13 A6679B - Jul 13, 17:05 UTCJul 14, 03:45 UTC10h 40m - -
2026-07-13 A6679B LHR → SFO Jul 13, 15:39 UTCJul 14, 03:41 UTC12h 2m +24m +13m
2026-07-12 A7F4E9 - Jul 12, 15:55 UTCJul 13, 02:15 UTC10h 20m - -
2026-07-11 A6679B LHR → SFO Jul 11, 15:55 UTCJul 12, 02:20 UTC10h 25m - -
2026-07-10 A7F4EC - Jul 10, 15:50 UTCJul 11, 02:20 UTC10h 30m - -
2026-07-09 A1BFAC - Jul 9, 15:40 UTCJul 10, 02:00 UTC10h 20m - -
2026-07-08 A6679B - Jul 8, 15:40 UTCJul 9, 01:45 UTC10h 5m - -
2026-07-08 A6679B LHR → SFO Jul 8, 15:39 UTCJul 9, 01:40 UTC10h 1m +24m on time
2026-07-07 A7F4EC - Jul 7, 15:35 UTCJul 8, 02:05 UTC10h 30m - -
2026-07-06 AB0F89 - Jul 6, 15:55 UTCJul 7, 02:20 UTC10h 25m - -
2026-07-05 A27C78 - Jul 5, 15:40 UTCJul 6, 02:00 UTC10h 20m - -
2026-07-04 A6679B - Jul 4, 15:45 UTCJul 5, 02:15 UTC10h 30m - -
2026-07-04 A6679B LHR → SFO Jul 4, 15:39 UTCJul 5, 02:09 UTC10h 30m +24m -2m

Performance history

Flights tracked
161 showing last 30
Avg arrival delay
+1m
On-time arrival
100% 100% on time
Aircraft used
7

Monthly activity 4 months

Month Flights tracked
July 2026 32
June 2026 37
May 2026 44
April 2026 48

UAL939 frequently asked

Where does flight UAL939 fly?
UAL939 (United Airlines) flies from LHR to SFO. View the full route page.
How long is flight UAL939?
Based on observed flights, UAL939 takes on average 9h 41m from takeoff to landing.
How often does UAL939 fly?
UAL939 has been observed flying several times a week in our tracking data. We've recorded 161 flights under this callsign.
Is flight UAL939 usually on time?
Across recent flights, UAL939 arrives with an average 1-minute delay. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL939?
UAL939 has been operated by 7 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL939 live?
Yes. When UAL939 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.