Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL639

Operated by UAL

Live map

Live map filtered to UAL639. Shown when the flight is currently airborne.

Route airports View route page →

Departure

BOS KBOS IFR

Boston Logan International Airport

Boston, US

Local time
08:50 EDT
Timezone
America/New_York
Type
Large Airport
Elevation
20 ft
Coordinates
42.3620, -71.0079

cloud Weather

Wind
40° / 28G43 kt
Visibility
1.75 SM
Ceiling
OVC 700 ft
Temp / Dew
11°C / 9°C
Altimeter
29.70 inHg
Wx
-RA BR

Obs: 2026-05-30T12:36:00.000Z

Raw METAR / TAF 
SPECI KBOS 301236Z 04028G43KT 1 3/4SM R04R/4500VP6000FT -RA BR OVC007 11/09 A2970 RMK AO2 PK WND 02043/1232 RAB07E13B28 PRESRR P0000 T01060094

TAF KBOS 301124Z 3012/3118 03020G32KT P6SM -RA SCT008 OVC015 FM301300 03022G44KT 6SM -RA BR SCT008 OVC010 TEMPO 3013/3017 3SM RA BR OVC008 FM302200 01017G28KT P6SM VCSH BKN020 FM310000 01013G20KT P6SM BKN060 FM310300 33010KT P6SM SCT250 FM310600 33007KT P6SM FEW250

flight Live Traffic

flight_takeoff 202 Departures
flight_land 195 Arrivals

Arrival

LAX KLAX MVFR

Los Angeles International Airport

Los Angeles, US

Local time
05:50 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
125 ft
Coordinates
33.9425, -118.4080

cloud Weather

Wind
340° / 3 kt
Visibility
10 SM
Ceiling
BKN 1,400 ft
Temp / Dew
16°C / 13°C
Altimeter
30.01 inHg

Obs: 2026-05-30T11:53:00.000Z

Raw METAR / TAF 
METAR KLAX 301153Z 34003KT 10SM BKN014 16/13 A3001 RMK AO2 SLP160 T01610133 10167 20156 53001 $

TAF KLAX 301120Z 3012/3118 VRB03KT P6SM OVC012 FM301600 VRB03KT P6SM SCT015 FM301900 26014KT P6SM SKC FM310300 VRB03KT P6SM SKC FM311000 12006KT P6SM OVC010 FM311600 VRB03KT P6SM SCT015

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 329 Departures
flight_land 340 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-05-29 A5D68A DEN → MSO May 29, 22:45 UTCMay 30, 04:55 UTC6h 10m - -
2026-05-28 A12AEA DEN → MSO May 28, 22:55 UTCMay 29, 04:25 UTC5h 30m - -
2026-05-27 A449A4 DEN → MSO May 27, 22:50 UTCMay 28, 04:30 UTC5h 40m - -
2026-05-26 AA7AA0 DEN → MSO May 26, 23:35 UTCMay 27, 04:59 UTC5h 25m - -
2026-05-25 A12F71 DEN → MSO May 25, 23:40 UTCMay 26, 04:54 UTC5h 15m - -
2026-05-25 A12B0E DEN → MSO May 25, 01:55 UTCMay 25, 05:10 UTC3h 15m - -
2026-05-24 A12B0E DEN → MSO May 24, 23:35 UTCMay 24, 23:46 UTC11m - -
2026-05-23 A44917 DEN → MSO May 23, 23:05 UTCMay 24, 04:45 UTC5h 40m - -
2026-05-22 A81006 DEN → MSO May 22, 22:45 UTCMay 23, 04:30 UTC5h 44m - -
2026-05-21 A4493C DEN → MSO May 21, 23:05 UTCMay 22, 05:00 UTC5h 55m - -
2026-05-20 A12F71 DEN → MSO May 20, 22:50 UTCMay 21, 04:45 UTC5h 55m - -
2026-05-20 A44939 DEN → MSO May 20, 00:40 UTCMay 20, 06:40 UTC6h 1m - -
2026-05-20 A44939 DEN → MSO May 20, 00:04 UTCMay 20, 06:36 UTC6h 32m +104m -29m
2026-05-19 A923CF DEN → MSO May 19, 01:30 UTCMay 19, 07:40 UTC6h 10m - -
2026-05-18 A5D28C DEN → MSO May 18, 10:25 UTCMay 18, 10:40 UTC15m - -
2026-05-17 A5D28C DEN → MSO May 17, 23:10 UTCMay 18, 05:15 UTC6h 5m - -
2026-05-17 A5D28C DEN → MSO May 17, 22:44 UTCMay 18, 05:08 UTC6h 24m +24m +12m
2026-05-16 A12F6D DEN → MSO May 16, 22:40 UTCMay 17, 04:35 UTC5h 55m - -
2026-05-16 A12F6D DEN → MSO May 16, 22:39 UTCMay 17, 04:31 UTC5h 52m +19m -11m
2026-05-15 A5D643 DEN → MSO May 15, 23:40 UTCMay 16, 05:05 UTC5h 25m - -
2026-05-15 A12AA5 DEN → MSO May 15, 00:05 UTCMay 15, 05:10 UTC5h 5m - -
2026-05-13 A12B0E DEN → MSO May 13, 23:00 UTCMay 14, 04:35 UTC5h 35m - -
2026-05-12 A4491D DEN → MSO May 12, 22:40 UTCMay 13, 04:30 UTC5h 50m - -
2026-05-12 A2BBF2 DEN → MSO May 12, 02:45 UTCMay 12, 04:40 UTC1h 55m - -
2026-05-10 A12AA5 DEN → MSO May 10, 22:40 UTCMay 11, 04:20 UTC5h 40m - -
2026-05-09 A12AE9 DEN → MSO May 9, 23:05 UTCMay 10, 04:55 UTC5h 50m - -
2026-05-08 A449A1 DEN → MSO May 8, 23:35 UTCMay 9, 05:30 UTC5h 55m - -
2026-05-07 A12F72 DEN → MSO May 7, 22:54 UTCMay 8, 04:44 UTC5h 50m - -
2026-05-06 A5D6F9 DEN → MSO May 6, 22:45 UTCMay 7, 04:30 UTC5h 45m - -
2026-05-05 A8F0BD DEN → MSO May 5, 22:40 UTCMay 6, 04:45 UTC6h 5m - -

Performance history

Flights tracked
71 showing last 30
Avg arrival delay
-9m
On-time arrival
100% 100% on time
Aircraft used
22

Monthly activity 2 months

Month Flights tracked
May 2026 35
April 2026 36

UAL639 frequently asked

Where does flight UAL639 fly?
UAL639 (UAL) flies from BOS to LAX. View the full route page.
How long is flight UAL639?
Based on observed flights, UAL639 takes on average 5h 14m from takeoff to landing.
How often does UAL639 fly?
UAL639 has been observed flying several times a week in our tracking data. We've recorded 71 flights under this callsign.
Is flight UAL639 usually on time?
Across recent flights, UAL639 arrives 9 minutes early on average. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL639?
UAL639 has been operated by 22 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL639 live?
Yes. When UAL639 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.