Apparatus

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flight_takeoff Flight

UAL423

Operated by United Airlines

Live map

Live map filtered to UAL423. Shown when the flight is currently airborne.

Route airports View route page →

Departure

YYZ CYYZ VFR

Toronto Pearson International Airport

Toronto, CA

Local time
18:51 EDT
Timezone
America/Toronto
Type
Large Airport
Elevation
569 ft
Coordinates
43.6759, -79.6294

cloud Weather

Wind
240° / 12G19 kt
Visibility
15 SM
Ceiling
FEW 5,700 ft, BKN 9,600 ft, BKN 25,000 ft
Temp / Dew
25°C / 14°C
Altimeter
30.10 inHg

Obs: 2026-08-29T22:00:00.000Z

Raw METAR / TAF 
METAR CYYZ 292200Z 24012G19KT 15SM FEW057 BKN096 BKN250 25/14 A3010 RMK CU2AC3CS2 SLP193 DENSITY ALT 1700FT

TAF CYYZ 292040Z 2921/3024 23010G20KT P6SM SCT050 BKN090 TEMPO 2921/2923 BKN050 BKN090 FM292300 22010KT P6SM SCT050 BKN200 FM300500 24005KT P6SM SCT060 BKN120 TEMPO 3005/3010 P6SM -SHRA BKN060 OVC120 FM301000 29005KT P6SM BKN050 OVC080 TEMPO 3010/3021 P6SM -SHRA BECMG 3016/3018 20006KT FM302100 20006KT P6SM -SHRA FEW020 OVC050 RMK NXT FCST BY 300000Z

flight Live Traffic

flight_takeoff 105 Departures
flight_land 100 Arrivals

Arrival

DEN KDEN VFR

Denver International Airport

Denver, US

Local time
16:51 MDT
Timezone
America/Denver
Type
Large Airport
Elevation
5,431 ft
Coordinates
39.8600, -104.6738

cloud Weather

Wind
300° / 17 kt
Visibility
10 SM
Ceiling
BKN 11,000 ft, BKN 14,000 ft, BKN 22,000 ft
Temp / Dew
29°C / 7°C
Altimeter
30.03 inHg

Obs: 2026-08-29T22:42:00.000Z

Raw METAR / TAF 
SPECI KDEN 292242Z 30017KT 10SM BKN110 BKN140 BKN220 29/07 A3003 RMK AO2 PK WND 29027/2232 WSHFT 2222 VIRGA T02890067

TAF KDEN 292056Z 2921/3024 18011KT P6SM VCSH SCT110 SCT140 BKN220 TEMPO 2921/2924 VRB20G35KT -TSRA BKN080CB FM300000 04012KT P6SM SCT100 BKN150 PROB30 3000/3002 -SHRA BKN100 FM300200 01010KT P6SM SCT100 BKN200 TEMPO 3002/3004 01020G35KT -SHRA BKN080 FM300700 19009KT P6SM FEW100 BKN200 FM301600 26008KT P6SM FEW090 BKN200 FM302000 34010KT P6SM SCT100 BKN150 PROB30 3020/3024 VRB20G35KT -TSRA BKN080CB

flight Live Traffic

flight_takeoff 336 Departures
flight_land 319 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-26 A05646 YYZ → DEN Jul 26, 11:05 UTCJul 26, 21:30 UTC10h 25m - -
2026-07-25 A0A522 YYZ → DEN Jul 25, 10:05 UTCJul 25, 20:45 UTC10h 40m - -
2026-07-24 A11BC8 YYZ → DEN Jul 24, 10:55 UTCJul 24, 21:35 UTC10h 40m - -
2026-07-23 A05628 YYZ → DEN Jul 23, 09:55 UTCJul 23, 20:40 UTC10h 45m - -
2026-07-22 A05627 YYZ → DEN Jul 22, 11:10 UTCJul 22, 21:15 UTC10h 5m - -
2026-07-21 A0F427 YYZ → DEN Jul 21, 09:55 UTCJul 21, 20:31 UTC10h 36m +20m -3m
2026-07-21 A0F427 YYZ → DEN Jul 21, 09:55 UTCJul 21, 20:50 UTC10h 55m - -
2026-07-20 A05629 ATH → ORD Jul 20, 09:55 UTCJul 20, 20:23 UTC10h 28m +20m +8m
2026-07-20 A05629 - Jul 20, 09:50 UTCJul 20, 10:15 UTC25m - -
2026-07-19 A07DC8 - Jul 19, 20:40 UTCJul 19, 20:50 UTC10m - -
2026-07-19 A07DC8 ATH → ORD Jul 19, 09:55 UTCJul 19, 20:22 UTC10h 27m +20m +3m
2026-07-19 A07DC8 ATH → ORD Jul 19, 10:15 UTCJul 19, 20:50 UTC10h 35m - -
2026-07-18 A11BC6 - Jul 18, 20:55 UTCJul 18, 21:10 UTC15m - -
2026-07-18 A11BC6 ATH → ORD Jul 18, 10:20 UTCJul 18, 21:10 UTC10h 50m - -
2026-07-18 A11BC6 ATH → ORD Jul 18, 10:15 UTCJul 18, 20:40 UTC10h 25m +40m -4m
2026-07-17 AC9923 ATH → ORD Jul 17, 12:10 UTCJul 17, 22:35 UTC10h 25m - -
2026-07-16 A05648 ATH → ORD Jul 16, 10:15 UTCJul 16, 20:45 UTC10h 30m - -
2026-07-15 A0F428 ATH → ORD Jul 15, 10:00 UTCJul 15, 20:25 UTC10h 25m - -
2026-07-14 A0A545 ATH → ORD Jul 14, 10:10 UTCJul 14, 20:50 UTC10h 40m - -
2026-07-13 A07DC8 ATH → ORD Jul 13, 11:05 UTCJul 13, 21:45 UTC10h 40m - -
2026-07-12 A11BA0 ATH → ORD Jul 12, 10:05 UTCJul 12, 20:40 UTC10h 35m - -
2026-07-11 A07DCD ATH → ORD Jul 11, 10:10 UTCJul 11, 20:35 UTC10h 25m - -
2026-07-10 A05627 ATH → ORD Jul 10, 10:05 UTCJul 10, 20:45 UTC10h 40m - -
2026-07-09 A07DC9 ATH → ORD Jul 9, 10:00 UTCJul 9, 20:40 UTC10h 40m - -
2026-07-09 A07DC9 ATH → ORD Jul 9, 10:00 UTCJul 9, 20:25 UTC10h 25m +25m +6m
2026-07-08 A11BA0 ATH → ORD Jul 8, 10:05 UTCJul 8, 21:00 UTC10h 55m - -
2026-07-07 A11BC6 - Jul 7, 10:10 UTCJul 7, 11:30 UTC1h 20m - -
2026-07-07 A11BC6 ATH → ORD Jul 7, 09:55 UTCJul 7, 20:34 UTC10h 39m +20m +10m
2026-07-06 A05629 ATH → ORD Jul 6, 11:00 UTCJul 6, 21:32 UTC10h 32m +85m -4m
2026-07-06 A05629 ATH → ORD Jul 6, 11:05 UTCJul 6, 21:50 UTC10h 45m - -

Performance history

Flights tracked
182 showing last 30
Avg arrival delay
+2m
On-time arrival
100% 100% on time
Aircraft used
16

Monthly activity 4 months

Month Flights tracked
July 2026 42
June 2026 51
May 2026 50
April 2026 39

UAL423 frequently asked

Where does flight UAL423 fly?
UAL423 (United Airlines) flies from YYZ to DEN. View the full route page.
How long is flight UAL423?
Based on observed flights, UAL423 takes on average 9h 15m from takeoff to landing.
How often does UAL423 fly?
UAL423 has been observed flying several times a week in our tracking data. We've recorded 182 flights under this callsign.
Is flight UAL423 usually on time?
Across recent flights, UAL423 arrives with an average 2-minute delay. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL423?
UAL423 has been operated by 16 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL423 live?
Yes. When UAL423 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.