UAL2123

UNITED AIRLINES INC · DEN → SFO

UAL2123 is operated by UNITED AIRLINES INC 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 57m. SkyMeter has observed 160 legs of this flight number via ADS-B.

✈
FLIGHTS
160
last 90 days
⏱
AVG DURATION
1h 57m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 8/12/2026
first → last seen
🗺
ROUTES / TYPES
13 / 7
city pairs · airframes
⚠
INCIDENT RATE
0.6%
1 flagged

Routes flown

By count · last 90 days

9
KDEN → KSFO
82
avg 2h 33m · Denver → San Francisco
KMCI → KDEN
38
avg 1h 38m · Kansas City → Denver
7CO3 → KDEN
1
avg 11m · Lindys Airpark → Denver
KMCI → KCOS
1
avg 1h 47m · Kansas City → City of Colorado Springs
K18V → KDEN
1
avg 10m · Platte Valley Airpark → Denver
US-0174 → KDEN
1
avg 14m · Aurora Airpark → Denver
06MO → KDEN
1
avg 1h 36m · Noahs Ark → Denver
9CO2 → KDEN
1
avg 21m · Van Slyke Field → Denver
2CD6 → KDEN
1
avg 23m · Safer → Denver

Aircraft types

Equipment used on this number

7
B738 BOEING Boeing 737-800
115
A21N AIRBUS Airbus A321 Neo
88
B39M BOEING Boeing 737 MAX 9
4
A320 AIRBUS Airbus A320
3
B739 BOEING Boeing 737-900
3
B38M BOEING Boeing 737 MAX 8
1
ST75 ST75
1

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
1
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
N37278BOEING Boeing 737 MAX 8
→
8/12/2026
2h 16m
No alerts
Replay Analysis
N76503BOEING Boeing 737-800
→
8/11/2026
1h 27m
No alerts
Replay Analysis
N14524AIRBUS Airbus A321 Neo
→
8/11/2026
2h 25m
No alerts
Replay Analysis
N37274BOEING Boeing 737-800
→
8/11/2026
1h 44m
No alerts
Replay Analysis
N37274BOEING Boeing 737-800
→
8/10/2026
2h 0m
No alerts
Replay Analysis
N37274BOEING Boeing 737-800
→
8/10/2026
16m
No alerts
Replay Analysis
N14521AIRBUS Airbus A321 Neo
→
8/10/2026
3h 8m
No alerts
Replay Analysis
N14521AIRBUS Airbus A321 Neo
→
8/10/2026
44m
No alerts
Replay Analysis
N37287BOEING Boeing 737-800
→
8/10/2026
1h 37m
No alerts
Replay Analysis
N14521AIRBUS Airbus A321 Neo
→
8/9/2026
2h 26m
No alerts
Replay Analysis
N73259BOEING Boeing 737-800
→
8/9/2026
1h 30m
No alerts
Replay Analysis
N73259BOEING Boeing 737-800
→
8/8/2026
35m
No alerts
Replay Analysis
N73259BOEING Boeing 737-800
→
8/8/2026
2h 6m
No alerts
Replay Analysis
N44501AIRBUS Airbus A321 Neo
→
8/8/2026
2h 27m
No alerts
Replay Analysis
N17245BOEING Boeing 737-800
→
8/7/2026
1h 19m
No alerts
Replay Analysis
N14566AIRBUS Airbus A321 Neo
→
8/7/2026
2h 27m
No alerts
Replay Analysis
N33203BOEING Boeing 737-800
→
8/7/2026
35m
No alerts
Replay Analysis
N33203BOEING Boeing 737-800
→
8/6/2026
49m
No alerts
Replay Analysis
N33203BOEING Boeing 737-800
→
8/6/2026
1h 26m
No alerts
Replay Analysis
N14518AIRBUS Airbus A321 Neo
→
8/6/2026
2h 7m
No alerts
Replay Analysis
N14518AIRBUS Airbus A321 Neo
→
8/6/2026
14m
No alerts
Replay Analysis
N17244BOEING Boeing 737-800
→
8/6/2026
23m
No alerts
Replay Analysis
N17244BOEING Boeing 737-800
→
8/5/2026
1h 14m
No alerts
Replay Analysis
N14507AIRBUS Airbus A321 Neo
→
8/5/2026
2h 30m
No alerts
Replay Analysis
N79521BOEING Boeing 737-800
→
8/4/2026
1h 17m
No alerts
Replay Analysis
N14531AIRBUS Airbus A321 Neo
→
8/4/2026
2h 21m
No alerts
Replay Analysis
N14230BOEING Boeing 737-800
→
8/4/2026
1h 18m
No alerts
Replay Analysis
N14230BOEING Boeing 737-800
→
8/4/2026
1h 27m
No alerts
Replay Analysis
N14230BOEING Boeing 737-800
→
8/3/2026
18m
No alerts
Replay Analysis
N14230BOEING Boeing 737-800
→
8/3/2026
1h 46m
↘ Diverted (inferred)
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window