UAL2121

UNITED AIRLINES INC · DEN → GRR

UAL2121 is operated by UNITED AIRLINES INC between Denver International Airport (KDEN) and Gerald R. Ford International Airport (KGRR). The flight is most often flown by a BOEING Boeing 737-900. Typical block time is 2h 8m. SkyMeter has observed 170 legs of this flight number via ADS-B.

✈
FLIGHTS
170
last 90 days
⏱
AVG DURATION
2h 8m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 07/01/2026
first → last seen
🗺
ROUTES / TYPES
12 / 5
city pairs · airframes
⚠
INCIDENT RATE
0.6%
1 flagged

Routes flown

By count · last 90 days

10
KDEN → KGRR
79
avg 2h 16m · Denver → Gerald R. Ford
KSEA → KSFO
42
avg 2h 5m · Seattle Tacoma → San Francisco
KSFO → KDEN
29
avg 2h 35m · San Francisco → Denver
KHAF → KCOS
1
avg 2h 52m · Half Moon Bay → City of Colorado Springs
KHAF → KDEN
1
avg 2h 36m · Half Moon Bay → Denver
KSEA → KS50
1
avg 3h 10m · Seattle Tacoma → Auburn
CO56 → KGRR
1
avg 2h 0m · Jjs → Gerald R. Ford
CO77 → KGRR
1
avg 2h 0m · Horth Strip → Gerald R. Ford
US-0188 → KDEN
1
avg 2h 26m · Coast Guard Air Station San Francisco → Denver
60CO → KGRR
1
avg 1h 53m · Stevens → Gerald R. Ford

Aircraft types

Equipment used on this number

5
B739 BOEING Boeing 737-900
127
A320 AIRBUS Airbus A320
40
B738 BOEING Boeing 737-800
14
A21N AIRBUS Airbus A321 Neo
10
B39M BOEING Boeing 737 MAX 9
8

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 UAL2121

30
N17244BOEING Boeing 737-800
→
07/01/2026
2h 0m
No alerts
Replay Analysis
N36469BOEING Boeing 737-900
→
06/30/2026
2h 9m
No alerts
Replay Analysis
N81449BOEING Boeing 737-900
→
06/29/2026
2h 24m
No alerts
Replay Analysis
N14235BOEING Boeing 737-800
→
06/28/2026
2h 26m
No alerts
Replay Analysis
N66831BOEING Boeing 737-900
→
06/27/2026
2h 20m
No alerts
Replay Analysis
N34460BOEING Boeing 737-900
→
06/26/2026
2h 18m
No alerts
Replay Analysis
N37468BOEING Boeing 737-900
→
06/25/2026
2h 25m
No alerts
Replay Analysis
N39461BOEING Boeing 737-900
→
06/24/2026
2h 20m
No alerts
Replay Analysis
N37462BOEING Boeing 737-900
→
06/23/2026
2h 29m
No alerts
Replay Analysis
N68805BOEING Boeing 737-900
→
06/22/2026
2h 36m
No alerts
Replay Analysis
N68805BOEING Boeing 737-900
→
06/21/2026
14m
No alerts
Replay Analysis
N37281BOEING Boeing 737-800
→
06/21/2026
2h 28m
No alerts
Replay Analysis
N69826BOEING Boeing 737-900
→
06/20/2026
2h 8m
No alerts
Replay Analysis
N69826BOEING Boeing 737-900
→
06/19/2026
2h 6m
No alerts
Replay Analysis
N69819BOEING Boeing 737-900
→
06/18/2026
2h 1m
No alerts
Replay Analysis
N87507BOEING Boeing 737-800
→
06/17/2026
2h 18m
No alerts
Replay Analysis
N61887BOEING Boeing 737-900
→
06/16/2026
2h 13m
No alerts
Replay Analysis
N66897BOEING Boeing 737-900
→
06/15/2026
2h 6m
No alerts
Replay Analysis
N87513BOEING Boeing 737-800
→
06/14/2026
2h 2m
No alerts
Replay Analysis
N68802BOEING Boeing 737-900
→
06/13/2026
2h 15m
No alerts
Replay Analysis
N62892BOEING Boeing 737-900
→
06/12/2026
1h 54m
No alerts
Replay Analysis
N66897BOEING Boeing 737-900
→
06/11/2026
2h 6m
No alerts
Replay Analysis
N77510BOEING Boeing 737-800
→
06/10/2026
2h 16m
No alerts
Replay Analysis
N39475BOEING Boeing 737-900
→
06/09/2026
2h 17m
No alerts
Replay Analysis
N76269BOEING Boeing 737-800
→
06/07/2026
2h 12m
No alerts
Replay Analysis
N27477BOEING Boeing 737-900
→
06/06/2026
2h 7m
No alerts
Replay Analysis
N39461BOEING Boeing 737-900
→
06/05/2026
2h 5m
No alerts
Replay Analysis
N37470BOEING Boeing 737-900
→
06/04/2026
2h 24m
No alerts
Replay Analysis
N33292BOEING Boeing 737-800
→
06/03/2026
2h 13m
No alerts
Replay Analysis
N68817BOEING Boeing 737-900
→
06/02/2026
2h 35m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window