UAL540 is operated by UNITED AIRLINES INC between Denver International Airport (KDEN) and San Diego International Airport (KSAN). The flight is most often flown by a AIRBUS Airbus A321 Neo. Typical block time is 2h 46m. SkyMeter has observed 201 legs of this flight number via ADS-B.

✈
FLIGHTS
201
last 90 days
⏱
AVG DURATION
2h 46m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 08/23/2026
first → last seen
🗺
ROUTES / TYPES
17 / 6
city pairs · airframes
⚠
INCIDENT RATE
0.5%
1 flagged

Routes flown

By count · last 90 days

10
KDEN → KSAN
72
avg 2h 24m · Denver → San Diego
KSFO → KDEN
60
avg 2h 41m · San Francisco → Denver
KRDU → KSFO
24
avg 5h 19m · Raleigh Durham → San Francisco
KHAF → KDEN
15
avg 2h 42m · Half Moon Bay → Denver
KOAK → KDEN
3
avg 2h 44m · Metropolitan Oakland → Denver
KGJT → KDEN
2
avg 48m · Grand Junction → Denver
KSFO → KCOS
2
avg 3h 13m · San Francisco → City of Colorado Springs
KSFO → KGJT
2
avg 3h 5m · San Francisco → Grand Junction
2CO9 → KGJT
1
avg 14m · Lands End Heliport → Grand Junction
KRDU → KLAS
1
avg 4h 43m · Raleigh Durham → McCarran

Aircraft types

Equipment used on this number

6
A21N AIRBUS Airbus A321 Neo
170
B38M BOEING Boeing 737 MAX 8
15
B738 BOEING Boeing 737-800
10
B39M BOEING Boeing 737 MAX 9
3
B753 BOEING Boeing 757-300
1
B739 BOEING Boeing 737-900
1

Safety profile

Flagged flights · last 90 days

Go-arounds
1
Unstable approach
0
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 UAL540

30
N34547AIRBUS Airbus A321 Neo
→
08/23/2026
3h 19m
↘ Diverted (inferred)
Replay Analysis
N14566AIRBUS Airbus A321 Neo
→
08/23/2026
2h 15m
No alerts
Replay Analysis
N94556AIRBUS Airbus A321 Neo
→
08/22/2026
3h 8m
No alerts
Replay Analysis
N24508AIRBUS Airbus A321 Neo
→
08/22/2026
2h 11m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
08/20/2026
3h 0m
No alerts
Replay Analysis
N54570AIRBUS Airbus A321 Neo
→
08/20/2026
2h 17m
No alerts
Replay Analysis
N27511BOEING Boeing 737 MAX 9
→
08/18/2026
2h 25m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
08/18/2026
2h 13m
No alerts
Replay Analysis
N14536AIRBUS Airbus A321 Neo
→
08/17/2026
3h 36m
No alerts
Replay Analysis
N14521AIRBUS Airbus A321 Neo
→
08/17/2026
2h 23m
No alerts
Replay Analysis
N14549AIRBUS Airbus A321 Neo
→
08/16/2026
3h 4m
No alerts
Replay Analysis
N34547AIRBUS Airbus A321 Neo
→
08/16/2026
2h 20m
No alerts
Replay Analysis
N14554AIRBUS Airbus A321 Neo
→
08/15/2026
2h 44m
No alerts
Replay Analysis
N24519AIRBUS Airbus A321 Neo
→
08/15/2026
48m
No alerts
Replay Analysis
N24519AIRBUS Airbus A321 Neo
→
08/14/2026
2h 51m
↘ Diverted (inferred)
Replay Analysis
N24505AIRBUS Airbus A321 Neo
→
08/14/2026
2h 20m
No alerts
Replay Analysis
N14546
→
08/13/2026
3h 1m
No alerts
Replay Analysis
N54538AIRBUS Airbus A321 Neo
→
08/12/2026
2h 8m
No alerts
Replay Analysis
N37532BOEING Boeing 737 MAX 9
→
08/11/2026
2h 40m
No alerts
Replay Analysis
N14520AIRBUS Airbus A321 Neo
→
08/11/2026
47m
No alerts
Replay Analysis
N14520AIRBUS Airbus A321 Neo
→
08/10/2026
3h 18m
No alerts
Replay Analysis
N14509AIRBUS Airbus A321 Neo
→
08/10/2026
2h 31m
No alerts
Replay Analysis
N14527AIRBUS Airbus A321 Neo
→
08/09/2026
2h 46m
No alerts
Replay Analysis
N14512AIRBUS Airbus A321 Neo
→
08/08/2026
12m
No alerts
Replay Analysis
N14512AIRBUS Airbus A321 Neo
→
08/08/2026
2h 53m
↘ Diverted
Replay Analysis
N14517AIRBUS Airbus A321 Neo
→
08/08/2026
2h 24m
No alerts
Replay Analysis
N14531AIRBUS Airbus A321 Neo
→
08/07/2026
2h 43m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
08/07/2026
2h 2m
No alerts
Replay Analysis
N14506AIRBUS Airbus A321 Neo
→
08/06/2026
2h 24m
No alerts
Replay Analysis
N24510AIRBUS Airbus A321 Neo
→
08/06/2026
2h 22m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window