Flight Status & Tracker

UAL2123

UNITED AIRLINES INC · DEN → SFO · Last tracked Sep 26, 2026

UAL2123 is a flight number operated by UNITED AIRLINES INC between Denver International Airport (KDEN) and San Francisco International Airport (KSFO). SkyMeter last tracked UAL2123 on September 26, 2026. The flight is most often flown by a BOEING Boeing 737-800. Typical block time is 1h 49m. SkyMeter has observed 185 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
185
last 90 days
⏱
AVG DURATION
1h 49m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 9/26/2026
first → last seen
🗺
ROUTES / TYPES
18 / 7
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

10
KDEN → KSFO
75
avg 2h 30m · Denver → San Francisco
KMCI → KDEN
55
avg 1h 37m · Kansas City → Denver
US-0174 → KDEN
2
avg 12m · Aurora Airpark → Denver
2CD6 → KDEN
1
avg 23m · Safer → Denver
03CO → KDEN
1
avg 12m · Kugel-Strong → Denver
KMCI → KCOS
1
avg 1h 47m · Kansas City → City of Colorado Springs
CD40 → KDEN
1
avg 15m · Hilltop Heliport → Denver
US-2549 → KDEN
1
avg 14m · Bigfoot Turf → Denver
7CO3 → KDEN
1
avg 11m · Lindys Airpark → Denver
K18V → KDEN
1
avg 10m · Platte Valley Airpark → Denver

Aircraft types

Equipment used on this number

7
B738 BOEING Boeing 737-800
137
A21N AIRBUS Airbus A321 Neo
74
B38M BOEING Boeing 737 MAX 8
19
B739 BOEING Boeing 737-900
5
A320 AIRBUS Airbus A320
3
A319 AIRBUS Airbus A319
2
ST75 ST75
1

Safety profile

Flagged flights · last 90 days

Go-arounds
0
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 UAL2123

30
N24555AIRBUS Airbus A321 Neo
→
9/26/2026
2h 34m
No alerts
Replay Analysis
N14545AIRBUS Airbus A321 Neo
→
9/25/2026
2h 27m
No alerts
Replay Analysis
N14541AIRBUS Airbus A321 Neo
→
9/24/2026
2h 33m
No alerts
Replay Analysis
N12238BOEING Boeing 737-800
→
9/24/2026
14m
No alerts
Replay Analysis
N12238BOEING Boeing 737-800
→
9/24/2026
1h 22m
No alerts
Replay Analysis
N14554AIRBUS Airbus A321 Neo
→
9/23/2026
2h 58m
No alerts
Replay Analysis
N17229BOEING Boeing 737-800
→
9/23/2026
1h 36m
No alerts
Replay Analysis
N14528AIRBUS Airbus A321 Neo
→
9/22/2026
2h 24m
No alerts
Replay Analysis
N47345BOEING Boeing 737 MAX 8
→
9/22/2026
32m
No alerts
Replay Analysis
N47345BOEING Boeing 737 MAX 8
→
9/22/2026
1h 16m
No alerts
Replay Analysis
N47345BOEING Boeing 737 MAX 8
→
9/22/2026
1h 49m
No alerts
Replay Analysis
N54552AIRBUS Airbus A321 Neo
→
9/21/2026
2h 30m
No alerts
Replay Analysis
N47291BOEING Boeing 737 MAX 8
→
9/21/2026
1h 27m
No alerts
Replay Analysis
N54538AIRBUS Airbus A321 Neo
→
9/20/2026
2h 21m
No alerts
Replay Analysis
N12238BOEING Boeing 737-800
→
9/20/2026
32m
No alerts
Replay Analysis
N12238BOEING Boeing 737-800
→
9/20/2026
1h 6m
No alerts
Replay Analysis
N12238BOEING Boeing 737-800
→
9/20/2026
1h 39m
No alerts
Replay Analysis
N27283BOEING Boeing 737 MAX 8
→
9/19/2026
2h 28m
No alerts
Replay Analysis
N76529BOEING Boeing 737-800
→
9/19/2026
1h 25m
No alerts
Replay Analysis
N14534AIRBUS Airbus A321 Neo
→
9/18/2026
2h 27m
No alerts
Replay Analysis
N57286BOEING Boeing 737 MAX 8
→
9/18/2026
16m
No alerts
Replay Analysis
N57286BOEING Boeing 737 MAX 8
→
9/18/2026
1h 23m
No alerts
Replay Analysis
N57286BOEING Boeing 737 MAX 8
→
9/18/2026
1h 6m
No alerts
Replay Analysis
N14564AIRBUS Airbus A321 Neo
→
9/17/2026
2h 30m
No alerts
Replay Analysis
N77525BOEING Boeing 737-800
→
9/17/2026
17m
No alerts
Replay Analysis
N77525BOEING Boeing 737-800
→
9/17/2026
1h 45m
No alerts
Replay Analysis
N77525BOEING Boeing 737-800
→
9/17/2026
1h 28m
No alerts
Replay Analysis
N24514AIRBUS Airbus A321 Neo
→
9/16/2026
2h 47m
No alerts
Replay Analysis
N17244BOEING Boeing 737-800
→
9/16/2026
1h 26m
No alerts
Replay Analysis
N14557AIRBUS Airbus A321 Neo
→
9/15/2026
2h 37m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window