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 2h 3m. SkyMeter has observed 197 legs of this flight number via ADS-B.

✈
FLIGHTS
197
last 90 days
⏱
AVG DURATION
2h 3m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 8/13/2026
first → last seen
🗺
ROUTES / TYPES
8 / 6
city pairs · airframes
⚠
INCIDENT RATE
2.5%
5 flagged

Routes flown

By count · last 90 days

4
KDEN → KPDX
79
avg 2h 31m · Denver → Portland
KDFW → KDEN
69
avg 1h 50m · Dallas Fort Worth → Denver
KPHL → KDEN
11
avg 3h 43m · Philadelphia → Denver
KIAD → KDEN
5
avg 3h 48m · Washington Dulles → Denver

Aircraft types

Equipment used on this number

6
B738 BOEING Boeing 737-800
96
B739 BOEING Boeing 737-900
77
B38M BOEING Boeing 737 MAX 8
9
B753 BOEING Boeing 757-300
6
B39M BOEING Boeing 737 MAX 9
5
A21N AIRBUS Airbus A321 Neo
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
N14531AIRBUS Airbus A321 Neo
→
8/13/2026
2h 28m
No alerts
Replay Analysis
N73291BOEING Boeing 737-800
→
8/13/2026
1h 37m
No alerts
Replay Analysis
N14528AIRBUS Airbus A321 Neo
→
8/12/2026
2h 23m
No alerts
Replay Analysis
N14515AIRBUS Airbus A321 Neo
→
8/11/2026
2h 13m
No alerts
Replay Analysis
N37287BOEING Boeing 737-800
→
8/11/2026
1h 42m
No alerts
Replay Analysis
N37287BOEING Boeing 737-800
→
8/11/2026
6m
No alerts
Replay Analysis
N66803BOEING Boeing 737-900
→
8/10/2026
2h 42m
No alerts
Replay Analysis
N36280BOEING Boeing 737-800
→
8/10/2026
1h 31m
No alerts
Replay Analysis
N68880BOEING Boeing 737-900
→
8/9/2026
1h 50m
No alerts
Replay Analysis
N64844BOEING Boeing 737-900
→
8/8/2026
2h 28m
No alerts
Replay Analysis
N73251BOEING Boeing 737-800
→
8/8/2026
1h 41m
No alerts
Replay Analysis
N67812BOEING Boeing 737-900
→
8/7/2026
2h 26m
No alerts
Replay Analysis
N17229BOEING Boeing 737-800
→
8/7/2026
1h 37m
No alerts
Replay Analysis
N66814BOEING Boeing 737-900
→
8/6/2026
2h 18m
No alerts
Replay Analysis
N37277BOEING Boeing 737-800
→
8/6/2026
2h 4m
No alerts
Replay Analysis
N63820BOEING Boeing 737-900
→
8/5/2026
2h 30m
No alerts
Replay Analysis
N78285BOEING Boeing 737-800
→
8/5/2026
1h 39m
No alerts
Replay Analysis
N68452BOEING Boeing 737-900
→
8/4/2026
2h 28m
No alerts
Replay Analysis
N33284BOEING Boeing 737-800
→
8/4/2026
1h 39m
No alerts
Replay Analysis
N69816BOEING Boeing 737-900
→
8/3/2026
2h 45m
↻ Go-around
Replay Analysis
N11206BOEING Boeing 737-800
→
8/3/2026
1h 34m
No alerts
Replay Analysis
N27421BOEING Boeing 737-900
→
8/2/2026
2h 25m
↻ Go-around
Replay Analysis
N18220BOEING Boeing 737-800
→
8/2/2026
1h 47m
No alerts
Replay Analysis
N73259BOEING Boeing 737-800
→
8/1/2026
1h 32m
No alerts
Replay Analysis
N36447BOEING Boeing 737-900
→
7/31/2026
2h 31m
No alerts
Replay Analysis
N26208BOEING Boeing 737-800
→
7/31/2026
1h 48m
No alerts
Replay Analysis
N64809BOEING Boeing 737-900
→
7/30/2026
2h 14m
No alerts
Replay Analysis
N35236BOEING Boeing 737-800
→
7/30/2026
2h 12m
No alerts
Replay Analysis
N39461BOEING Boeing 737-900
→
7/29/2026
2h 27m
No alerts
Replay Analysis
N36247BOEING Boeing 737-800
→
7/29/2026
1h 52m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window