UAL577 is operated by UNITED AIRLINES INC between Newark Liberty International Airport (KEWR) and General Edward Lawrence Logan International Airport (KBOS). The flight is most often flown by a AIRBUS Airbus A321 Neo. Typical block time is 2h 15m. SkyMeter has observed 26 legs of this flight number via ADS-B.

✈
FLIGHTS
26
last 90 days
⏱
AVG DURATION
2h 15m
tracked time
📅
SERVICE PERIOD
04/17/2026 → 06/03/2026
first → last seen
🗺
ROUTES / TYPES
3 / 3
city pairs · airframes
⚠
INCIDENT RATE
3.8%
1 flagged

Routes flown

By count · last 90 days

2
KEWR → KBOS
15
avg 1h 0m · Newark Liberty → General Edward Lawrence Logan
KEWR → KDEN
10
avg 3h 54m · Newark Liberty → Denver

Aircraft types

Equipment used on this number

3
A21N AIRBUS Airbus A321 Neo
11
B739 BOEING Boeing 737-900
10
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
1
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 26 operations of UAL577

26
N24519AIRBUS Airbus A321 Neo
→
06/03/2026
3h 48m
No alerts
Replay Analysis
N24516AIRBUS Airbus A321 Neo
→
06/02/2026
3h 45m
No alerts
Replay Analysis
N24519AIRBUS Airbus A321 Neo
→
06/01/2026
4h 9m
No alerts
Replay Analysis
N14569AIRBUS Airbus A321 Neo
→
05/31/2026
4h 1m
No alerts
Replay Analysis
N14559AIRBUS Airbus A321 Neo
→
05/29/2026
4h 23m
No alerts
Replay Analysis
N14504AIRBUS Airbus A321 Neo
→
05/28/2026
3h 46m
No alerts
Replay Analysis
N14527AIRBUS Airbus A321 Neo
→
05/26/2026
3h 38m
No alerts
Replay Analysis
N24514AIRBUS Airbus A321 Neo
→
05/25/2026
3h 42m
No alerts
Replay Analysis
N24516AIRBUS Airbus A321 Neo
→
05/24/2026
4h 2m
No alerts
Replay Analysis
N14534AIRBUS Airbus A321 Neo
→
05/23/2026
3h 58m
No alerts
Replay Analysis
N24537AIRBUS Airbus A321 Neo
→
05/21/2026
4h 12m
No alerts
Replay Analysis
N66897BOEING Boeing 737-900
→
05/20/2026
1h 8m
No alerts
Replay Analysis
N47414BOEING Boeing 737-900
→
05/18/2026
1h 4m
No alerts
Replay Analysis
N37419BOEING Boeing 737-900
→
05/17/2026
1h 3m
No alerts
Replay Analysis
N61887BOEING Boeing 737-900
→
05/16/2026
1h 2m
No alerts
Replay Analysis
N39423BOEING Boeing 737-900
→
05/15/2026
45m
No alerts
Replay Analysis
N47414BOEING Boeing 737-900
→
05/14/2026
49m
! Stall
Replay Analysis
N39450BOEING Boeing 737-900
→
05/13/2026
56m
No alerts
Replay Analysis
N39461BOEING Boeing 737-900
→
05/11/2026
54m
No alerts
Replay Analysis
N37462BOEING Boeing 737-900
→
05/10/2026
1h 8m
No alerts
Replay Analysis
N75428BOEING Boeing 737-900
→
05/03/2026
56m
No alerts
Replay Analysis
N47280BOEING Boeing 737 MAX 8
→
04/23/2026
1h 14m
No alerts
Replay Analysis
N37372BOEING Boeing 737 MAX 8
→
04/21/2026
50m
No alerts
Replay Analysis
N27273BOEING Boeing 737 MAX 8
→
04/20/2026
1h 0m
No alerts
Replay Analysis
N17285BOEING Boeing 737 MAX 8
→
04/19/2026
45m
No alerts
Replay Analysis
N17309BOEING Boeing 737 MAX 8
→
04/17/2026
1h 21m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window