UAL577 is operated by UNITED AIRLINES INC between Newark Liberty International Airport (KEWR) and Denver International Airport (KDEN). The flight is most often flown by a AIRBUS Airbus A321 Neo. Typical block time is 2h 52m. SkyMeter has observed 111 legs of this flight number via ADS-B.

✈
FLIGHTS
111
last 90 days
⏱
AVG DURATION
2h 52m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 07/19/2026
first → last seen
🗺
ROUTES / TYPES
8 / 4
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

4
KEWR → KDEN
47
avg 4h 4m · Newark Liberty → Denver
KMCO → KEWR
23
avg 2h 22m · Orlando → Newark Liberty
KEWR → KBOS
23
avg 58m · Newark Liberty → General Edward Lawrence Logan
56KS → KDEN
1
avg 59m · Robinson Heliport → Denver

Aircraft types

Equipment used on this number

4
A21N AIRBUS Airbus A321 Neo
63
B739 BOEING Boeing 737-900
28
B39M BOEING Boeing 737 MAX 9
18
B38M BOEING Boeing 737 MAX 8
5

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 UAL577

30
N44501AIRBUS Airbus A321 Neo
→
07/19/2026
44m
No alerts
Replay Analysis
N44501AIRBUS Airbus A321 Neo
→
07/19/2026
3h 36m
No alerts
Replay Analysis
N37422BOEING Boeing 737-900
→
07/19/2026
2h 26m
No alerts
Replay Analysis
N37531BOEING Boeing 737 MAX 9
→
07/18/2026
2h 41m
No alerts
Replay Analysis
N24555AIRBUS Airbus A321 Neo
→
07/17/2026
3h 46m
No alerts
Replay Analysis
N27439BOEING Boeing 737 MAX 9
→
07/17/2026
1h 52m
No alerts
Replay Analysis
N14554AIRBUS Airbus A321 Neo
→
07/16/2026
3h 47m
No alerts
Replay Analysis
N37542BOEING Boeing 737 MAX 9
→
07/16/2026
2h 22m
No alerts
Replay Analysis
N14569AIRBUS Airbus A321 Neo
→
07/15/2026
3h 45m
No alerts
Replay Analysis
N69829BOEING Boeing 737-900
→
07/15/2026
2h 20m
No alerts
Replay Analysis
N24526AIRBUS Airbus A321 Neo
→
07/14/2026
3h 20m
No alerts
Replay Analysis
N87442BOEING Boeing 737 MAX 9
→
07/14/2026
2h 26m
No alerts
Replay Analysis
N14528AIRBUS Airbus A321 Neo
→
07/13/2026
3h 32m
No alerts
Replay Analysis
N77572BOEING Boeing 737 MAX 9
→
07/13/2026
2h 31m
No alerts
Replay Analysis
N14559AIRBUS Airbus A321 Neo
→
07/12/2026
3h 33m
No alerts
Replay Analysis
N62889BOEING Boeing 737-900
→
07/12/2026
2h 18m
No alerts
Replay Analysis
N14520AIRBUS Airbus A321 Neo
→
07/11/2026
3h 51m
No alerts
Replay Analysis
N17431BOEING Boeing 737 MAX 9
→
07/11/2026
2h 16m
No alerts
Replay Analysis
N14531AIRBUS Airbus A321 Neo
→
07/10/2026
3h 57m
No alerts
Replay Analysis
N17428BOEING Boeing 737 MAX 9
→
07/10/2026
2h 29m
No alerts
Replay Analysis
N44501AIRBUS Airbus A321 Neo
→
07/10/2026
58m
No alerts
Replay Analysis
N44501AIRBUS Airbus A321 Neo
→
07/09/2026
5h 15m
No alerts
Replay Analysis
N27568BOEING Boeing 737 MAX 9
→
07/09/2026
2h 21m
No alerts
Replay Analysis
N54538AIRBUS Airbus A321 Neo
→
07/08/2026
3h 52m
No alerts
Replay Analysis
N17405BOEING Boeing 737 MAX 9
→
07/08/2026
2h 23m
No alerts
Replay Analysis
N14569AIRBUS Airbus A321 Neo
→
07/07/2026
3h 57m
No alerts
Replay Analysis
N39415BOEING Boeing 737-900
→
07/07/2026
2h 11m
No alerts
Replay Analysis
N34562AIRBUS Airbus A321 Neo
→
07/07/2026
3h 25m
No alerts
Replay Analysis
N34562AIRBUS Airbus A321 Neo
→
07/06/2026
4h 55m
No alerts
Replay Analysis
N34562AIRBUS Airbus A321 Neo
→
07/06/2026
1h 29m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window