Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL1721

Operated by United Airlines

Live map

Live map filtered to UAL1721. Shown when the flight is currently airborne.

Route airports View route page →

Departure

SFO KSFO VFR

San Francisco International Airport

San Francisco, US

Local time
22:58 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
13 ft
Coordinates
37.6198, -122.3748

cloud Weather

Wind
280° / 23 kt
Visibility
10 SM
Ceiling
FEW 400 ft, SCT 15,000 ft, BKN 20,000 ft
Temp / Dew
16°C / 13°C
Altimeter
29.98 inHg

Obs: 2026-08-28T04:56:00.000Z

Raw METAR / TAF 
METAR KSFO 280456Z 28023KT 10SM FEW004 SCT150 BKN200 16/13 A2998 RMK AO2 PK WND 27026/0456 SLP150 T01610133 $

TAF KSFO 280520Z 2806/2912 29008KT P6SM BKN150 FM281100 30008KT P6SM VCSH BKN050 OVC100 FM282000 29014KT P6SM VCSH BKN050 OVC100 FM290300 29010KT P6SM SCT010 BKN120 FM291000 29007KT P6SM BKN010

flight Live Traffic

flight_takeoff 154 Departures
flight_land 140 Arrivals

Arrival

KOA PHKO VFR

Ellison Onizuka Kona International Airport at Keāhole

Kailua-Kona, US

Local time
19:58 HST
Timezone
Pacific/Honolulu
Type
Large Airport
Elevation
47 ft
Coordinates
19.7388, -156.0456

cloud Weather

Wind
50° / 15 kt
Visibility
10 SM
Ceiling
SCT 2,000 ft, BKN 5,500 ft
Temp / Dew
27°C / 20°C
Altimeter
29.91 inHg

Obs: 2026-08-28T05:28:00.000Z

Raw METAR / TAF 
SPECI PHKO 280528Z 05015KT 10SM SCT020 BKN055 27/20 A2991 RMK AO2 T02720200

TAF PHKO 280537Z 2806/2912 09011KT P6SM SCT020 BKN050 FM282000 25010KT P6SM VCSH FEW025 SCT050 FM290400 07006KT P6SM BKN050

flight Live Traffic

flight_takeoff 10 Departures
flight_land 6 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-26 AA3AE2 SFO → KOA Jul 26, 20:45 UTCJul 26, 20:50 UTC5m - -
2026-07-26 AA3AE2 SFO → KOA Jul 26, 15:55 UTCJul 26, 16:35 UTC40m - -
2026-07-25 AA3B05 SFO → KOA Jul 25, 20:55 UTCJul 25, 21:05 UTC10m - -
2026-07-25 AA3B05 SFO → KOA Jul 25, 16:00 UTCJul 25, 16:45 UTC45m - -
2026-07-24 A76F87 SFO → KOA Jul 24, 20:10 UTCJul 24, 20:25 UTC15m - -
2026-07-24 A76F87 SFO → KOA Jul 24, 15:25 UTCJul 24, 15:55 UTC30m - -
2026-07-23 AA3AE9 SFO → KOA Jul 23, 23:30 UTCJul 23, 23:35 UTC5m - -
2026-07-23 AA3AE9 SFO → KOA Jul 23, 18:17 UTCJul 23, 23:31 UTC5h 14m +187m +32m
2026-07-23 AA3AE9 SFO → KOA Jul 23, 18:00 UTCJul 23, 19:05 UTC1h 5m - -
2026-07-22 AA3AE5 SFO → KOA Jul 22, 20:25 UTCJul 22, 20:35 UTC10m - -
2026-07-22 AA3AE5 SFO → KOA Jul 22, 15:35 UTCJul 22, 16:15 UTC40m - -
2026-07-21 A76F67 - Jul 21, 20:50 UTCJul 21, 20:55 UTC5m - -
2026-07-21 A76F67 - Jul 21, 16:00 UTCJul 21, 16:30 UTC30m - -
2026-07-20 A76F6C - Jul 20, 20:25 UTCJul 20, 20:35 UTC10m - -
2026-07-20 A76F6C - Jul 20, 15:40 UTCJul 20, 16:20 UTC40m - -
2026-07-19 A76F67 - Jul 19, 20:25 UTCJul 19, 20:40 UTC15m - -
2026-07-19 A76F67 - Jul 19, 15:45 UTCJul 19, 16:15 UTC30m - -
2026-07-18 A9EC06 - Jul 18, 20:15 UTCJul 18, 20:35 UTC20m - -
2026-07-18 A9EC06 SFO → KOA Jul 18, 15:32 UTCJul 18, 20:40 UTC5h 8m +22m -5m
2026-07-18 A9EC06 - Jul 18, 15:40 UTCJul 18, 16:10 UTC30m - -
2026-07-17 AA3AE4 - Jul 17, 20:10 UTCJul 17, 20:29 UTC20m - -
2026-07-17 AA3AE4 SFO → KOA Jul 17, 15:32 UTCJul 17, 20:25 UTC4h 53m +22m -16m
2026-07-17 AA3AE4 - Jul 17, 15:29 UTCJul 17, 16:10 UTC40m - -
2026-07-16 A9EC06 - Jul 16, 20:15 UTCJul 16, 20:25 UTC10m - -
2026-07-16 A9EC06 - Jul 16, 15:30 UTCJul 16, 16:09 UTC40m - -
2026-07-15 AA3AE4 - Jul 15, 20:15 UTCJul 15, 20:30 UTC15m - -
2026-07-15 AA3AE4 - Jul 15, 15:40 UTCJul 15, 16:10 UTC30m - -
2026-07-14 A9EC06 - Jul 14, 20:15 UTCJul 14, 20:35 UTC20m - -
2026-07-14 A9EC06 - Jul 14, 15:45 UTCJul 14, 16:20 UTC35m - -
2026-07-13 A76F87 - Jul 13, 16:15 UTCJul 13, 16:50 UTC35m - -

Performance history

Flights tracked
228 showing last 30
Avg arrival delay
+4m
On-time arrival
67% 67% on time
Aircraft used
9

Monthly activity 4 months

Month Flights tracked
July 2026 59
June 2026 65
May 2026 64
April 2026 40

UAL1721 frequently asked

Where does flight UAL1721 fly?
UAL1721 (United Airlines) flies from SFO to KOA. View the full route page.
How long is flight UAL1721?
Based on observed flights, UAL1721 takes on average 54m from takeoff to landing.
How often does UAL1721 fly?
UAL1721 has been observed flying several times a week in our tracking data. We've recorded 228 flights under this callsign.
Is flight UAL1721 usually on time?
Across recent flights, UAL1721 arrives with an average 4-minute delay. 67% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL1721?
UAL1721 has been operated by 9 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL1721 live?
Yes. When UAL1721 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.