Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL821

Operated by UAL

Live map

Live map filtered to UAL821. Shown when the flight is currently airborne.

Route airports View route page →

Departure

BKK VTBS VFR

Suvarnabhumi Airport

Bangkok, TH

Local time
18:38 GMT+7
Timezone
Asia/Bangkok
Type
Large Airport
Elevation
5 ft
Coordinates
13.6811, 100.7470

cloud Weather

Wind
90° / 5 kt
Visibility
6 SM
Ceiling
FEW 2,000 ft
Temp / Dew
32°C / 22°C
Altimeter
29.85 inHg

Obs: 2026-10-12T11:00:00.000Z

Raw METAR / TAF 
METAR VTBS 121100Z 09005KT 020V160 9999 FEW020 32/22 Q1011 NOSIG

TAF VTBS 120500Z 1206/1312 06008KT 9999 FEW020 TEMPO 1208/1212 -TSRA FEW018CB SCT030 BECMG 1220/1222 34005KT BECMG 1301/1303 05008KT

flight Live Traffic

flight_takeoff 2 Departures
flight_land 0 Arrivals

Arrival

HKG VHHH VFR

Hong Kong International Airport

Hong Kong, HK

Local time
19:38 GMT+8
Timezone
Asia/Hong_Kong
Type
Large Airport
Elevation
28 ft
Coordinates
22.3118, 113.9149

cloud Weather

Wind
110° / 5 kt
Visibility
6 SM
Ceiling
CAVOK
Temp / Dew
29°C / 21°C
Altimeter
29.97 inHg

Obs: 2026-10-12T11:30:00.000Z

Raw METAR / TAF 
METAR VHHH 121130Z 11005KT 080V150 CAVOK 29/21 Q1015 NOSIG

TAF VHHH 121100Z 1212/1318 10010KT 9999 FEW040 TX32/1306Z TN26/1222Z TEMPO 1221/1301 04010KT BECMG 1303/1305 26010KT BECMG 1309/1311 11010KT

flight Live Traffic

flight_takeoff 16 Departures
flight_land 15 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-25 A31A96 SFO → MEX Jul 25, 16:30 UTCJul 26, 03:30 UTC11h 0m - -
2026-07-25 A31A96 SFO → MEX Jul 25, 14:25 UTCJul 25, 14:40 UTC15m - -
2026-07-25 A31A96 SFO → MEX Jul 25, 12:05 UTCJul 25, 12:10 UTC5m - -
2026-07-25 A31A96 SFO → MEX Jul 25, 09:35 UTCJul 25, 10:10 UTC35m - -
2026-07-25 A31A96 SFO → MEX Jul 25, 09:35 UTCJul 25, 12:07 UTC2h 32m +50m +14m
2026-07-24 A43100 SFO → MEX Jul 24, 14:10 UTCJul 25, 03:20 UTC13h 10m - -
2026-07-24 A43100 SFO → MEX Jul 24, 11:15 UTCJul 24, 11:35 UTC20m - -
2026-07-24 A43100 SFO → MEX Jul 24, 09:15 UTCJul 24, 09:35 UTC20m - -
2026-07-23 A31A56 SFO → MEX Jul 23, 14:35 UTCJul 24, 03:55 UTC13h 20m - -
2026-07-23 A31A56 SFO → MEX Jul 23, 10:05 UTCJul 23, 11:30 UTC1h 25m - -
2026-07-23 A31A56 SFO → MEX Jul 23, 09:35 UTCJul 23, 12:20 UTC2h 45m +50m -9m
2026-07-22 A31A34 SFO → MEX Jul 22, 14:10 UTCJul 23, 03:05 UTC12h 55m - -
2026-07-22 A31A34 SFO → MEX Jul 22, 11:10 UTCJul 22, 11:30 UTC20m - -
2026-07-21 A09FC4 SFO → MEX Jul 21, 14:20 UTCJul 22, 03:25 UTC13h 5m - -
2026-07-21 A09FC4 SFO → MEX Jul 21, 10:55 UTCJul 21, 11:15 UTC20m - -
2026-07-21 A09FC4 SFO → MEX Jul 21, 08:50 UTCJul 21, 09:15 UTC25m - -
2026-07-20 A31A34 SFO → MEX Jul 20, 14:10 UTCJul 20, 17:20 UTC3h 10m - -
2026-07-20 A31A34 SFO → MEX Jul 20, 14:06 UTCJul 21, 03:28 UTC13h 22m +21m -4m
2026-07-20 A31A34 SFO → MEX Jul 20, 11:00 UTCJul 20, 11:20 UTC20m - -
2026-07-20 A31A34 SFO → MEX Jul 20, 09:00 UTCJul 20, 09:30 UTC30m - -
2026-07-19 A22D7B SFO → MEX Jul 19, 14:20 UTCJul 20, 03:20 UTC13h 0m - -
2026-07-19 A22D7B SFO → MEX Jul 19, 11:00 UTCJul 19, 11:15 UTC15m - -
2026-07-19 A22D7B SFO → MEX Jul 19, 09:00 UTCJul 19, 09:10 UTC10m - -
2026-07-19 A22D7B SFO → MEX Jul 19, 09:05 UTCJul 19, 11:13 UTC2h 8m +20m +1m
2026-07-18 A2A41E SFO → MEX Jul 18, 13:55 UTCJul 19, 03:20 UTC13h 25m - -
2026-07-18 A2A41E SFO → MEX Jul 18, 11:10 UTCJul 18, 11:30 UTC20m - -
2026-07-18 A2A41E SFO → MEX Jul 18, 09:05 UTCJul 18, 09:15 UTC10m - -
2026-07-17 A47FD9 SFO → MEX Jul 17, 14:15 UTCJul 18, 03:35 UTC13h 21m - -
2026-07-17 A47FD9 SFO → MEX Jul 17, 11:15 UTCJul 17, 11:35 UTC20m - -
2026-07-17 A47FD9 SFO → MEX Jul 17, 09:10 UTCJul 17, 09:25 UTC15m - -

Performance history

Flights tracked
377 showing last 30
Avg arrival delay
+1m
On-time arrival
100% 100% on time
Aircraft used
8

Monthly activity 4 months

Month Flights tracked
July 2026 89
June 2026 107
May 2026 104
April 2026 77

UAL821 frequently asked

Where does flight UAL821 fly?
UAL821 (UAL) flies from BKK to HKG. View the full route page.
How long is flight UAL821?
Based on observed flights, UAL821 takes on average 4h 27m from takeoff to landing.
How often does UAL821 fly?
UAL821 has been observed flying several times a week in our tracking data. We've recorded 377 flights under this callsign.
Is flight UAL821 usually on time?
Across recent flights, UAL821 arrives with an average 1-minute delay. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL821?
UAL821 has been operated by 8 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL821 live?
Yes. When UAL821 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.