Flight Status & Tracker

UAL540

UNITED AIRLINES INC · DEN → SAN · Last tracked Oct 19, 2026

UAL540 is a flight number operated by UNITED AIRLINES INC between Denver International Airport (KDEN) and San Diego International Airport (KSAN). SkyMeter last tracked UAL540 on October 19, 2026. The flight is most often flown by a AIRBUS Airbus A321 Neo. Typical block time is 2h 33m. SkyMeter has observed 181 legs of this flight number via ADS-B.

SkyMeter tracks historical flight activity from ADS-B data — this is not a live gate-to-gate status feed.

✈
FLIGHTS
181
last 90 days
⏱
AVG DURATION
2h 33m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 10/19/2026
first → last seen
🗺
ROUTES / TYPES
18 / 4
city pairs · airframes
⚠
INCIDENT RATE
0.6%
1 flagged

Routes flown

By count · last 90 days

10
KDEN → KSAN
66
avg 2h 22m · Denver → San Diego
KSFO → KDEN
59
avg 2h 52m · San Francisco → Denver
KSAN → KORD
13
avg 3h 53m · San Diego → Chicago O'Hare
KHAF → KDEN
9
avg 2h 51m · Half Moon Bay → Denver
KGJT → KDEN
2
avg 48m · Grand Junction → Denver
KSFO → KGJT
2
avg 3h 5m · San Francisco → Grand Junction
KSFO → KCOS
2
avg 3h 13m · San Francisco → City of Colorado Springs
KDEN → KFTG
1
avg 2h 24m · Denver → Colorado Air and Space Port
KOAK → KDEN
1
avg 3h 1m · Metropolitan Oakland → Denver
2CO9 → KDEN
1
avg 52m · Lands End Heliport → Denver

Aircraft types

Equipment used on this number

4
A21N AIRBUS Airbus A321 Neo
154
B39M BOEING Boeing 737 MAX 9
22
B753 BOEING Boeing 757-300
1
ST75 ST75
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
N14523AIRBUS Airbus A321 Neo
→
10/19/2026
2h 23m
No alerts
Replay Analysis
N54561ST75
→
10/18/2026
2h 53m
No alerts
Replay Analysis
N77426BOEING Boeing 737 MAX 9
→
10/18/2026
4h 7m
No alerts
Replay Analysis
N14544AIRBUS Airbus A321 Neo
→
10/18/2026
2h 21m
No alerts
Replay Analysis
N14554AIRBUS Airbus A321 Neo
→
10/16/2026
2h 53m
No alerts
Replay Analysis
N37563BOEING Boeing 737 MAX 9
→
10/16/2026
3h 32m
No alerts
Replay Analysis
N14528AIRBUS Airbus A321 Neo
→
10/16/2026
2h 6m
No alerts
Replay Analysis
N14553AIRBUS Airbus A321 Neo
→
10/15/2026
3h 20m
No alerts
Replay Analysis
N17448BOEING Boeing 737 MAX 9
→
10/15/2026
3h 37m
No alerts
Replay Analysis
N24513AIRBUS Airbus A321 Neo
→
10/15/2026
2h 8m
No alerts
Replay Analysis
N14503AIRBUS Airbus A321 Neo
→
10/14/2026
2h 18m
No alerts
Replay Analysis
N14518AIRBUS Airbus A321 Neo
→
10/12/2026
2h 23m
↘ Diverted (inferred)
Replay Analysis
N34562AIRBUS Airbus A321 Neo
→
10/10/2026
2h 14m
No alerts
Replay Analysis
N17436BOEING Boeing 737 MAX 9
→
10/10/2026
3h 28m
No alerts
Replay Analysis
N14536AIRBUS Airbus A321 Neo
→
10/10/2026
2h 19m
No alerts
Replay Analysis
N14504AIRBUS Airbus A321 Neo
→
10/9/2026
2h 38m
No alerts
Replay Analysis
N37549BOEING Boeing 737 MAX 9
→
10/9/2026
4h 18m
No alerts
Replay Analysis
N14569AIRBUS Airbus A321 Neo
→
10/9/2026
2h 25m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
10/8/2026
2h 21m
No alerts
Replay Analysis
N17408BOEING Boeing 737 MAX 9
→
10/8/2026
3h 57m
No alerts
Replay Analysis
N14527AIRBUS Airbus A321 Neo
→
10/7/2026
2h 47m
No alerts
Replay Analysis
N57416BOEING Boeing 737 MAX 9
→
10/7/2026
3h 51m
No alerts
Replay Analysis
N14539AIRBUS Airbus A321 Neo
→
10/7/2026
2h 8m
No alerts
Replay Analysis
N14520AIRBUS Airbus A321 Neo
→
10/6/2026
3h 6m
No alerts
Replay Analysis
N17429BOEING Boeing 737 MAX 9
→
10/6/2026
3h 56m
No alerts
Replay Analysis
N14521AIRBUS Airbus A321 Neo
→
10/6/2026
2h 14m
No alerts
Replay Analysis
N24508AIRBUS Airbus A321 Neo
→
10/5/2026
2h 23m
No alerts
Replay Analysis
N77579BOEING Boeing 737 MAX 9
→
10/5/2026
3h 57m
No alerts
Replay Analysis
N14564AIRBUS Airbus A321 Neo
→
10/5/2026
2h 5m
No alerts
Replay Analysis
N14517AIRBUS Airbus A321 Neo
→
10/4/2026
2h 33m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window