UAL421 is operated by UNITED AIRLINES INC between John Wayne Airport-Orange County Airport (KSNA) and Denver International Airport (KDEN). The flight is most often flown by a AIRBUS Airbus A321 Neo. Typical block time is 2h 8m. SkyMeter has observed 36 legs of this flight number via ADS-B.

✈
FLIGHTS
36
last 90 days
⏱
AVG DURATION
2h 8m
tracked time
📅
SERVICE PERIOD
04/17/2026 → 06/03/2026
first → last seen
🗺
ROUTES / TYPES
8 / 3
city pairs · airframes
⚠
INCIDENT RATE
8.3%
3 flagged

Routes flown

By count · last 90 days

3
KSNA → KDEN
14
avg 2h 2m · John Wayne Airport-Orange County → Denver
KDEN → KIAD
7
avg 3h 34m · Denver → Washington Dulles
US-0404 → KDEN
1
avg 1h 58m · Centerport Heliport → Denver

Aircraft types

Equipment used on this number

3
A21N AIRBUS Airbus A321 Neo
26
A320 AIRBUS Airbus A320
15
A319 AIRBUS Airbus A319
6

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
3
Rejected TO
0
Stall warnings
0
Overspeeds
0
Runway excursion
0
Counts represent flights with at least one occurrence of each flag, not the total event count. See /incidents for individual events.

Recent flights

Newest 30 operations of UAL421

30
N14521AIRBUS Airbus A321 Neo
→
06/03/2026
2h 10m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/03/2026
1h 19m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/02/2026
3h 34m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/02/2026
2h 14m
No alerts
Replay Analysis
N14517AIRBUS Airbus A321 Neo
→
06/02/2026
3h 41m
No alerts
Replay Analysis
N14506AIRBUS Airbus A321 Neo
→
05/31/2026
2h 5m
No alerts
Replay Analysis
N14557AIRBUS Airbus A321 Neo
→
05/31/2026
1h 21m
No alerts
Replay Analysis
N14523AIRBUS Airbus A321 Neo
→
05/29/2026
2h 10m
No alerts
Replay Analysis
N74532AIRBUS Airbus A321 Neo
→
05/29/2026
1h 24m
No alerts
Replay Analysis
N74532AIRBUS Airbus A321 Neo
→
05/28/2026
1h 50m
No alerts
Replay Analysis
N74532AIRBUS Airbus A321 Neo
→
05/28/2026
3h 15m
No alerts
Replay Analysis
N14564AIRBUS Airbus A321 Neo
→
05/28/2026
1h 16m
No alerts
Replay Analysis
N44522AIRBUS Airbus A321 Neo
→
05/26/2026
2h 12m
No alerts
Replay Analysis
N14517AIRBUS Airbus A321 Neo
→
05/26/2026
1h 47m
No alerts
Replay Analysis
N14517AIRBUS Airbus A321 Neo
→
05/25/2026
2h 11m
No alerts
Replay Analysis
N14517AIRBUS Airbus A321 Neo
→
05/25/2026
3h 59m
No alerts
Replay Analysis
N14506AIRBUS Airbus A321 Neo
→
05/25/2026
1h 22m
No alerts
Replay Analysis
N14506AIRBUS Airbus A321 Neo
→
05/24/2026
3h 24m
No alerts
Replay Analysis
N14506AIRBUS Airbus A321 Neo
→
05/24/2026
2h 2m
No alerts
Replay Analysis
N24519AIRBUS Airbus A321 Neo
→
05/24/2026
1h 9m
No alerts
Replay Analysis
N24519AIRBUS Airbus A321 Neo
→
05/23/2026
2h 11m
No alerts
Replay Analysis
N24519AIRBUS Airbus A321 Neo
→
05/23/2026
3h 20m
No alerts
Replay Analysis
N14559AIRBUS Airbus A321 Neo
→
05/22/2026
46m
No alerts
Replay Analysis
N14563AIRBUS Airbus A321 Neo
→
05/22/2026
1h 28m
No alerts
Replay Analysis
N14563AIRBUS Airbus A321 Neo
→
05/21/2026
2h 13m
No alerts
Replay Analysis
N14563AIRBUS Airbus A321 Neo
→
05/21/2026
3h 42m
No alerts
Replay Analysis
N434UAAIRBUS Airbus A320
→
05/20/2026
1h 58m
No alerts
Replay Analysis
N453UAAIRBUS Airbus A320
→
05/18/2026
1h 57m
No alerts
Replay Analysis
N460UAAIRBUS Airbus A320
→
05/17/2026
2h 26m
No alerts
Replay Analysis
N433UAAIRBUS Airbus A320
→
05/15/2026
2h 2m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window