UAL644 is operated by UNITED AIRLINES INC between Denver International Airport (KDEN) and Portland International Airport (KPDX). The flight is most often flown by a BOEING Boeing 737-800. Typical block time is 1h 57m. SkyMeter has observed 194 legs of this flight number via ADS-B.

✈
FLIGHTS
194
last 90 days
⏱
AVG DURATION
1h 57m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 08/20/2026
first → last seen
🗺
ROUTES / TYPES
7 / 5
city pairs · airframes
⚠
INCIDENT RATE
2.6%
5 flagged

Routes flown

By count · last 90 days

3
KDEN → KPDX
78
avg 2h 31m · Denver → Portland
KDFW → KDEN
75
avg 1h 49m · Dallas Fort Worth → Denver
KPHL → KDEN
8
avg 3h 42m · Philadelphia → Denver

Aircraft types

Equipment used on this number

5
B738 BOEING Boeing 737-800
103
B739 BOEING Boeing 737-900
69
A21N AIRBUS Airbus A321 Neo
10
B38M BOEING Boeing 737 MAX 8
8
B39M BOEING Boeing 737 MAX 9
4

Safety profile

Flagged flights · last 90 days

Go-arounds
4
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 UAL644

30
N74532AIRBUS Airbus A321 Neo
→
08/20/2026
2h 49m
No alerts
Replay Analysis
N12216BOEING Boeing 737-800
→
08/20/2026
1h 48m
No alerts
Replay Analysis
N76508BOEING Boeing 737-800
→
08/19/2026
23m
No alerts
Replay Analysis
N54552AIRBUS Airbus A321 Neo
→
08/18/2026
2h 36m
No alerts
Replay Analysis
N33289BOEING Boeing 737-800
→
08/18/2026
1h 38m
No alerts
Replay Analysis
N14531AIRBUS Airbus A321 Neo
→
08/17/2026
2h 38m
No alerts
Replay Analysis
N14249BOEING Boeing 737-800
→
08/17/2026
21m
No alerts
Replay Analysis
N14249BOEING Boeing 737-800
→
08/17/2026
1h 34m
No alerts
Replay Analysis
N24505AIRBUS Airbus A321 Neo
→
08/16/2026
2h 35m
No alerts
Replay Analysis
N77525BOEING Boeing 737-800
→
08/16/2026
1h 41m
No alerts
Replay Analysis
N14564AIRBUS Airbus A321 Neo
→
08/15/2026
2h 15m
No alerts
Replay Analysis
N77525BOEING Boeing 737-800
→
08/15/2026
1h 30m
No alerts
Replay Analysis
N24555AIRBUS Airbus A321 Neo
→
08/14/2026
2h 44m
No alerts
Replay Analysis
N24224BOEING Boeing 737-800
→
08/14/2026
1h 40m
No alerts
Replay Analysis
N14531AIRBUS Airbus A321 Neo
→
08/13/2026
2h 28m
No alerts
Replay Analysis
N73291BOEING Boeing 737-800
→
08/13/2026
1h 37m
No alerts
Replay Analysis
N14528AIRBUS Airbus A321 Neo
→
08/12/2026
2h 23m
No alerts
Replay Analysis
N14515AIRBUS Airbus A321 Neo
→
08/11/2026
2h 13m
No alerts
Replay Analysis
N37287BOEING Boeing 737-800
→
08/11/2026
1h 42m
No alerts
Replay Analysis
N37287BOEING Boeing 737-800
→
08/11/2026
6m
No alerts
Replay Analysis
N66803BOEING Boeing 737-900
→
08/10/2026
2h 42m
No alerts
Replay Analysis
N36280BOEING Boeing 737-800
→
08/10/2026
1h 31m
No alerts
Replay Analysis
N68880BOEING Boeing 737-900
→
08/09/2026
1h 50m
No alerts
Replay Analysis
N64844BOEING Boeing 737-900
→
08/08/2026
2h 28m
No alerts
Replay Analysis
N73251BOEING Boeing 737-800
→
08/08/2026
1h 41m
No alerts
Replay Analysis
N67812BOEING Boeing 737-900
→
08/07/2026
2h 26m
No alerts
Replay Analysis
N17229BOEING Boeing 737-800
→
08/07/2026
1h 37m
No alerts
Replay Analysis
N66814BOEING Boeing 737-900
→
08/06/2026
2h 18m
No alerts
Replay Analysis
N37277BOEING Boeing 737-800
→
08/06/2026
2h 4m
No alerts
Replay Analysis
N63820BOEING Boeing 737-900
→
08/05/2026
2h 30m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window