Apparatus

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flight_takeoff Flight

UAL521T

Operated by United Airlines

Live map

Live map filtered to UAL521T. Shown when the flight is currently airborne.

Route airports View route page →

Departure

IAH KIAH VFR

George Bush Intercontinental Airport

Houston, US

Local time
23:59 CDT
Timezone
America/Chicago
Type
Large Airport
Elevation
97 ft
Coordinates
29.9844, -95.3414

cloud Weather

Wind
200° / 4 kt
Visibility
10 SM
Ceiling
FEW 25,000 ft
Temp / Dew
27°C / 23°C
Altimeter
29.89 inHg

Obs: 2026-05-30T03:53:00.000Z

Raw METAR / TAF 
METAR KIAH 300353Z 20004KT 10SM FEW250 27/23 A2989 RMK AO2 SLP119 T02670228

TAF KIAH 292320Z 3000/3106 VRB05KT P6SM SCT050 BKN250 FM301100 VRB03KT P6SM SCT010 FM301500 21006KT P6SM FEW025 FM301800 17009KT P6SM SCT040 BKN250 FM310300 18006KT P6SM FEW030 BKN250

flight Live Traffic

flight_takeoff 289 Departures
flight_land 319 Arrivals

Arrival

BOS KBOS VFR

Boston Logan International Airport

Boston, US

Local time
00:59 EDT
Timezone
America/New_York
Type
Large Airport
Elevation
20 ft
Coordinates
42.3620, -71.0079

cloud Weather

Wind
120° / 15 kt
Visibility
10 SM
Ceiling
FEW 9,000 ft, BKN 11,000 ft
Temp / Dew
14°C / 13°C
Altimeter
29.65 inHg

Obs: 2026-05-30T03:54:00.000Z

Raw METAR / TAF 
METAR KBOS 300354Z 12015KT 10SM FEW090 BKN110 14/13 A2965 RMK AO2 SLP041 T01440128

TAF KBOS 300423Z 3004/3106 12012G20KT P6SM -SHRA OVC040 TEMPO 3004/3006 4SM SHRA FM300700 05013KT P6SM BKN020 FM301000 36020G32KT P6SM VCSH OVC020 FM301200 03025G44KT 3SM RA BR OVC010 FM302200 01017G28KT P6SM VCSH BKN050 FM310100 33005KT P6SM BKN130

flight Live Traffic

flight_takeoff 219 Departures
flight_land 239 Arrivals

Recent history last 7

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-05-05 AA56D8 IAH → BOS May 5, 23:50 UTCMay 6, 03:15 UTC3h 25m - -
2026-05-02 A12712 IAH → BOS May 2, 02:05 UTCMay 2, 04:55 UTC2h 50m - -
2026-05-02 A12712 IAH → BOS May 2, 02:06 UTCMay 2, 04:51 UTC2h 45m +149m -7m
2026-04-26 A5CA4B IAH → BOS Apr 26, 00:15 UTCApr 26, 03:30 UTC3h 15m - -
2026-04-26 A5CA4B IAH → BOS Apr 26, 00:16 UTCApr 26, 03:27 UTC3h 11m +34m -5m
2026-04-23 A55FA2 IAH → BOS Apr 23, 00:20 UTCApr 23, 03:55 UTC3h 35m - -
2026-04-23 A55FA2 IAH → BOS Apr 23, 00:13 UTCApr 23, 03:52 UTC3h 39m +31m -5m

Performance history

Flights tracked
7
Avg arrival delay
-6m
On-time arrival
100% 100% on time
Aircraft used
4

Monthly activity 2 months

Month Flights tracked
May 2026 3
April 2026 4

UAL521T frequently asked

Where does flight UAL521T fly?
UAL521T (United Airlines) flies from IAH to BOS. View the full route page.
How long is flight UAL521T?
Based on observed flights, UAL521T takes on average 3h 14m from takeoff to landing.
How often does UAL521T fly?
UAL521T has been observed flying occasionally in our tracking data. We've recorded 7 flights under this callsign.
Is flight UAL521T usually on time?
Across recent flights, UAL521T arrives 6 minutes early on average. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL521T?
UAL521T has been operated by 4 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL521T live?
Yes. When UAL521T 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.