Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL639

Operated by United Airlines

Live map

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

Route airports View route page →

Departure

DEN KDEN IFR

Denver International Airport

Denver, US

Local time
02:36 MDT
Timezone
America/Denver
Type
Large Airport
Elevation
5,431 ft
Coordinates
39.8600, -104.6738

cloud Weather

Wind
90° / 14 kt
Visibility
10 SM
Ceiling
BKN 700 ft, BKN 1,200 ft, OVC 5,000 ft
Temp / Dew
8°C / 7°C
Altimeter
30.11 inHg

Obs: 2026-10-14T07:53:00.000Z

Raw METAR / TAF 
METAR KDEN 140753Z 09014KT 10SM BKN007 BKN012 OVC050 08/07 A3011 RMK AO2 RAE26 SLP151 P0000 T00830072

TAF KDEN 140535Z 1406/1512 07007KT P6SM VCSH SCT030 BKN050 TEMPO 1406/1408 5SM -RA BR SCT005 BKN010 FM140800 09010KT P6SM SCT003 BKN008 BKN050 TEMPO 1408/1412 4SM -DZ BR OVC003 FM141500 11011KT P6SM VCSH BKN005 OVC008 FM141900 09009KT P6SM VCSH BKN008 OVC020 TEMPO 1422/1502 4SM SHRA BR OVC003 FM150500 01010KT P6SM SCT004 BKN010 PROB30 1505/1511 -SHRA BKN004 FM151100 35011KT P6SM VCSH BKN008 BKN040

flight Live Traffic

flight_takeoff 113 Departures
flight_land 102 Arrivals

Arrival

MSO KMSO VFR

Missoula Montana Airport

Missoula, US

Local time
02:36 MDT
Timezone
America/Denver
Type
Medium Airport
Elevation
3,206 ft
Coordinates
46.9158, -114.0911

cloud Weather

Wind
0° / 0 kt
Visibility
10 SM
Ceiling
CLR
Temp / Dew
1°C / 0°C
Altimeter
30.26 inHg

Obs: 2026-10-14T07:53:00.000Z

Raw METAR / TAF 
METAR KMSO 140753Z AUTO 00000KT 10SM CLR 01/00 A3026 RMK AO2 SLP265 T00110000

TAF KMSO 140522Z 1406/1506 VRB03KT P6SM SKC FM141000 VRB03KT P6SM VCFG FEW009 FM141500 30003KT P6SM SKC

flight Live Traffic

flight_takeoff 11 Departures
flight_land 9 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-25 A12EE0 DEN → MSO Jul 25, 22:45 UTCJul 26, 04:20 UTC5h 35m - -
2026-07-24 A12AA5 DEN → MSO Jul 24, 22:45 UTCJul 25, 03:55 UTC5h 10m +19m -4m
2026-07-24 A12AA5 DEN → MSO Jul 24, 22:40 UTCJul 25, 04:05 UTC5h 25m - -
2026-07-23 A449A3 DEN → MSO Jul 23, 23:45 UTCJul 24, 05:10 UTC5h 25m - -
2026-07-22 A44938 DEN → MSO Jul 22, 23:05 UTCJul 23, 04:40 UTC5h 35m - -
2026-07-22 A5D2D4 DEN → MSO Jul 22, 02:30 UTCJul 22, 05:25 UTC2h 55m - -
2026-07-20 AA7F4E DEN → MSO Jul 20, 23:25 UTCJul 21, 04:50 UTC5h 24m - -
2026-07-19 A12AA0 DEN → MSO Jul 19, 22:55 UTCJul 20, 04:05 UTC5h 10m - -
2026-07-19 A75FBF DEN → MSO Jul 19, 00:15 UTCJul 19, 05:35 UTC5h 20m - -
2026-07-17 A12E80 DEN → MSO Jul 17, 23:30 UTCJul 18, 04:45 UTC5h 16m - -
2026-07-17 A12E80 DEN → MSO Jul 17, 23:09 UTCJul 18, 04:36 UTC5h 27m +43m -16m
2026-07-16 A448F5 DEN → MSO Jul 16, 23:05 UTCJul 17, 04:29 UTC5h 25m - -
2026-07-15 AA7F24 - Jul 15, 23:00 UTCJul 16, 04:30 UTC5h 30m - -
2026-07-14 A5D2D4 - Jul 14, 23:10 UTCJul 15, 04:25 UTC5h 15m - -
2026-07-14 A5D2D4 BOS → LAX Jul 14, 22:45 UTCJul 15, 04:15 UTC5h 30m +19m -25m
2026-07-13 A44939 - Jul 13, 23:00 UTCJul 14, 04:05 UTC5h 5m - -
2026-07-13 A12AC3 - Jul 13, 00:20 UTCJul 13, 05:31 UTC5h 10m - -
2026-07-11 A449A4 - Jul 11, 23:40 UTCJul 12, 04:55 UTC5h 15m - -
2026-07-11 A449CB - Jul 11, 00:30 UTCJul 11, 06:01 UTC5h 30m - -
2026-07-11 A449CB BOS → LAX Jul 11, 00:19 UTCJul 11, 05:55 UTC5h 36m +113m +15m
2026-07-10 A445A4 - Jul 10, 00:40 UTCJul 10, 06:35 UTC5h 55m - -
2026-07-09 A445A4 BOS → LAX Jul 9, 23:47 UTCJul 10, 06:26 UTC6h 39m +81m -49m
2026-07-08 AA7F46 - Jul 8, 23:15 UTCJul 9, 04:40 UTC5h 25m - -
2026-07-07 A5D6F9 - Jul 7, 23:15 UTCJul 8, 04:40 UTC5h 25m - -
2026-07-06 A448D6 - Jul 6, 23:00 UTCJul 7, 04:25 UTC5h 25m - -
2026-07-06 A2BBF2 - Jul 6, 00:40 UTCJul 6, 06:05 UTC5h 25m - -
2026-07-05 A2BBF2 BOS → LAX Jul 5, 22:55 UTCJul 6, 05:59 UTC7h 4m +19m -122m
2026-07-04 ABFBD0 - Jul 4, 16:00 UTCJul 4, 20:25 UTC4h 25m - -
2026-07-03 AA7F06 - Jul 3, 23:05 UTCJul 4, 04:50 UTC5h 45m - -
2026-07-03 AA7F06 BOS → BOS Jul 3, 22:35 UTCJul 3, 22:40 UTC5m - -

Performance history

Flights tracked
142 showing last 30
Avg arrival delay
-33m
On-time arrival
100% 100% on time
Aircraft used
22

Monthly activity 4 months

Month Flights tracked
July 2026 33
June 2026 37
May 2026 36
April 2026 36

UAL639 frequently asked

Where does flight UAL639 fly?
UAL639 (United Airlines) flies from DEN to MSO. View the full route page.
How long is flight UAL639?
Based on observed flights, UAL639 takes on average 5h 13m 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 142 flights under this callsign.
Is flight UAL639 usually on time?
Across recent flights, UAL639 arrives 33 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.