UAL2123

United Airlines · DEN → SFO

UAL2123 is operated by United Airlines between Denver International Airport (KDEN) and San Francisco International Airport (KSFO). The flight is most often flown by a BOEING Boeing 737-800. Typical block time is 1h 58m. SkyMeter has observed 158 legs of this flight number via ADS-B.

✈
FLIGHTS
158
last 90 days
⏱
AVG DURATION
1h 58m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 06/29/2026
first → last seen
🗺
ROUTES / TYPES
7 / 7
city pairs · airframes
⚠
INCIDENT RATE
7.0%
11 flagged

Routes flown

By count · last 90 days

4
KDEN → KSFO
77
avg 2h 39m · Denver → San Francisco
KMCI → KDEN
33
avg 1h 37m · Kansas City → Denver
71CO → KDEN
2
avg 18m · Houston Heliport → Denver
0CO3 → KDEN
1
avg 20m · Greggs Nr 1 → Denver

Aircraft types

Equipment used on this number

7
B738 BOEING Boeing 737-800
97
A21N AIRBUS Airbus A321 Neo
44
B38M BOEING Boeing 737 MAX 8
26
B39M BOEING Boeing 737 MAX 9
19
A320 AIRBUS Airbus A320
11
B739 BOEING Boeing 737-900
11
A319 AIRBUS Airbus A319
6

Safety profile

Flagged flights · last 90 days

Go-arounds
1
Unstable approach
10
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 UAL2123

30
N73291BOEING Boeing 737-800
→
06/29/2026
1h 17m
No alerts
Replay Analysis
N54552AIRBUS Airbus A321 Neo
→
06/29/2026
2h 54m
No alerts
Replay Analysis
N76528BOEING Boeing 737-800
→
06/29/2026
29m
No alerts
Replay Analysis
N76528BOEING Boeing 737-800
→
06/28/2026
1h 47m
No alerts
Replay Analysis
N76528BOEING Boeing 737-800
→
06/28/2026
1h 17m
No alerts
Replay Analysis
N14531AIRBUS Airbus A321 Neo
→
06/28/2026
2h 51m
No alerts
Replay Analysis
N77530BOEING Boeing 737-800
→
06/28/2026
53m
△ Unstable
Replay Analysis
N77530BOEING Boeing 737-800
→
06/27/2026
1h 53m
△ Unstable
Replay Analysis
N77530BOEING Boeing 737-800
→
06/27/2026
59m
No alerts
Replay Analysis
N14529AIRBUS Airbus A321 Neo
→
06/27/2026
2h 53m
No alerts
Replay Analysis
N78506BOEING Boeing 737-800
→
06/27/2026
15m
No alerts
Replay Analysis
N78506BOEING Boeing 737-800
→
06/26/2026
1h 25m
No alerts
Replay Analysis
N94556AIRBUS Airbus A321 Neo
→
06/26/2026
2h 37m
No alerts
Replay Analysis
N61898BOEING Boeing 737-900
→
06/26/2026
16m
No alerts
Replay Analysis
N61898BOEING Boeing 737-900
→
06/25/2026
1h 28m
No alerts
Replay Analysis
N61898BOEING Boeing 737-900
→
06/25/2026
1h 11m
No alerts
Replay Analysis
N74532AIRBUS Airbus A321 Neo
→
06/25/2026
2h 36m
No alerts
Replay Analysis
N14515AIRBUS Airbus A321 Neo
→
06/24/2026
2h 26m
No alerts
Replay Analysis
N94556AIRBUS Airbus A321 Neo
→
06/23/2026
2h 53m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/22/2026
2h 49m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/22/2026
44m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/22/2026
23m
No alerts
Replay Analysis
N24514AIRBUS Airbus A321 Neo
→
06/21/2026
2h 30m
No alerts
Replay Analysis
N14509AIRBUS Airbus A321 Neo
→
06/20/2026
2h 37m
No alerts
Replay Analysis
N14503AIRBUS Airbus A321 Neo
→
06/19/2026
2h 27m
No alerts
Replay Analysis
N14503AIRBUS Airbus A321 Neo
→
06/19/2026
14m
No alerts
Replay Analysis
N14509AIRBUS Airbus A321 Neo
→
06/18/2026
2h 20m
No alerts
Replay Analysis
N14541AIRBUS Airbus A321 Neo
→
06/17/2026
2h 41m
No alerts
Replay Analysis
N14541AIRBUS Airbus A321 Neo
→
06/16/2026
2h 46m
No alerts
Replay Analysis
N14541AIRBUS Airbus A321 Neo
→
06/16/2026
13m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window