Flight Status & Tracker

UAL2121

UNITED AIRLINES INC · DEN → GRR · Last tracked Oct 10, 2026

UAL2121 is a flight number operated by UNITED AIRLINES INC between Denver International Airport (KDEN) and Gerald R. Ford International Airport (KGRR). SkyMeter last tracked UAL2121 on October 10, 2026. The flight is most often flown by a BOEING Boeing 737-900. Typical block time is 2h 14m. SkyMeter has observed 84 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
84
last 90 days
⏱
AVG DURATION
2h 14m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 10/10/2026
first → last seen
🗺
ROUTES / TYPES
2 / 3
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

1
KDEN → KGRR
79
avg 2h 21m · Denver → Gerald R. Ford

Aircraft types

Equipment used on this number

3
B739 BOEING Boeing 737-900
65
B39M BOEING Boeing 737 MAX 9
17
B738 BOEING Boeing 737-800
6

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 UAL2121

30
N27463BOEING Boeing 737 MAX 9
→
10/10/2026
2h 15m
No alerts
Replay Analysis
N36447BOEING Boeing 737-900
→
10/8/2026
1h 45m
No alerts
Replay Analysis
N36447BOEING Boeing 737-900
→
10/8/2026
13m
No alerts
Replay Analysis
N36447BOEING Boeing 737-900
→
10/8/2026
2h 24m
No alerts
Replay Analysis
N77558BOEING Boeing 737 MAX 9
→
10/6/2026
2h 18m
No alerts
Replay Analysis
N77575BOEING Boeing 737 MAX 9
→
10/5/2026
1h 51m
No alerts
Replay Analysis
N77575BOEING Boeing 737 MAX 9
→
10/5/2026
12m
No alerts
Replay Analysis
N77575BOEING Boeing 737 MAX 9
→
10/5/2026
2h 4m
No alerts
Replay Analysis
N37549BOEING Boeing 737 MAX 9
→
10/4/2026
2h 9m
No alerts
Replay Analysis
N77426BOEING Boeing 737 MAX 9
→
10/3/2026
2h 7m
No alerts
Replay Analysis
N77426BOEING Boeing 737 MAX 9
→
10/3/2026
20m
No alerts
Replay Analysis
N17594BOEING Boeing 737-900
→
10/2/2026
2h 16m
No alerts
Replay Analysis
N47453BOEING Boeing 737 MAX 9
→
10/1/2026
2h 11m
No alerts
Replay Analysis
N47453BOEING Boeing 737 MAX 9
→
10/1/2026
17m
No alerts
Replay Analysis
N17429BOEING Boeing 737 MAX 9
→
9/30/2026
1h 58m
No alerts
Replay Analysis
N17429BOEING Boeing 737 MAX 9
→
9/30/2026
14m
No alerts
Replay Analysis
N17452BOEING Boeing 737 MAX 9
→
9/29/2026
2h 15m
No alerts
Replay Analysis
N34455BOEING Boeing 737-900
→
9/28/2026
2h 27m
No alerts
Replay Analysis
N17438BOEING Boeing 737 MAX 9
→
9/27/2026
2h 33m
No alerts
Replay Analysis
N37577BOEING Boeing 737 MAX 9
→
9/26/2026
2h 17m
No alerts
Replay Analysis
N17441BOEING Boeing 737 MAX 9
→
9/25/2026
2h 22m
No alerts
Replay Analysis
N67845BOEING Boeing 737-900
→
9/24/2026
2h 11m
No alerts
Replay Analysis
N69830BOEING Boeing 737-900
→
9/23/2026
2h 17m
No alerts
Replay Analysis
N38446BOEING Boeing 737-900
→
9/22/2026
2h 11m
No alerts
Replay Analysis
N75435BOEING Boeing 737-900
→
9/21/2026
2h 18m
No alerts
Replay Analysis
N68821BOEING Boeing 737-900
→
9/20/2026
3h 21m
No alerts
Replay Analysis
N68821BOEING Boeing 737-900
→
9/19/2026
2h 14m
No alerts
Replay Analysis
N68891BOEING Boeing 737-900
→
9/18/2026
2h 20m
No alerts
Replay Analysis
N36444BOEING Boeing 737-900
→
9/17/2026
2h 18m
No alerts
Replay Analysis
N68842BOEING Boeing 737-900
→
9/16/2026
2h 18m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window