UAL661 is operated by UNITED AIRLINES INC between Newark Liberty International Airport (KEWR) and Chicago O'Hare International Airport (KORD). The flight is most often flown by a BOEING Boeing 757-200. Typical block time is 3h 16m. SkyMeter has observed 207 legs of this flight number via ADS-B.

✈
FLIGHTS
207
last 90 days
⏱
AVG DURATION
3h 16m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 8/11/2026
first → last seen
🗺
ROUTES / TYPES
17 / 6
city pairs · airframes
⚠
INCIDENT RATE
0.5%
1 flagged

Routes flown

By count · last 90 days

10
KEWR → KORD
66
avg 2h 24m · Newark Liberty → Chicago O'Hare
KSNA → KEWR
63
avg 5h 7m · John Wayne Airport-Orange County → Newark Liberty
KORD → KLAX
27
avg 4h 6m · Chicago O'Hare → Los Angeles
KSNA → KCLE
2
avg 4h 45m · John Wayne Airport-Orange County → Cleveland Hopkins
KSNA → KORD
2
avg 4h 9m · John Wayne Airport-Orange County → Chicago O'Hare
KDPA → KORD
1
avg 41m · Dupage → Chicago O'Hare
KSNA → KIAD
1
avg 5h 11m · John Wayne Airport-Orange County → Washington Dulles
KIAD → KEWR
1
avg 1h 48m · Washington Dulles → Newark Liberty
KSNA → KCLT
1
avg 4h 53m · John Wayne Airport-Orange County → Charlotte Douglas
KSNA → KRIC
1
avg 6h 2m · John Wayne Airport-Orange County → Richmond

Aircraft types

Equipment used on this number

6
B752 BOEING Boeing 757-200
106
B737 BOEING Boeing 737-700
79
A21N AIRBUS Airbus A321 Neo
26
B739 BOEING Boeing 737-900
10
B39M BOEING Boeing 737 MAX 9
4
B753 BOEING Boeing 757-300
1

Safety profile

Flagged flights · last 90 days

Go-arounds
0
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 UAL661

30
N19141BOEING Boeing 757-200
→
8/11/2026
1h 26m
No alerts
Replay Analysis
N13716BOEING Boeing 737-700
→
8/11/2026
5h 3m
No alerts
Replay Analysis
N24542AIRBUS Airbus A321 Neo
→
8/11/2026
3h 55m
No alerts
Replay Analysis
N16703BOEING Boeing 737-700
→
8/10/2026
5h 43m
No alerts
Replay Analysis
N12116BOEING Boeing 757-200
→
8/10/2026
1h 44m
No alerts
Replay Analysis
N12116BOEING Boeing 757-200
→
8/9/2026
31m
No alerts
Replay Analysis
N12116BOEING Boeing 757-200
→
8/9/2026
2h 16m
No alerts
Replay Analysis
N14121BOEING Boeing 757-200
→
8/8/2026
5m
No alerts
Replay Analysis
N14121BOEING Boeing 757-200
→
8/8/2026
2h 5m
No alerts
Replay Analysis
N24702BOEING Boeing 737-700
→
8/8/2026
5h 13m
No alerts
Replay Analysis
N13716BOEING Boeing 737-700
→
8/7/2026
5h 2m
No alerts
Replay Analysis
N33714BOEING Boeing 737-700
→
8/6/2026
2h 45m
No alerts
Replay Analysis
N14521AIRBUS Airbus A321 Neo
→
8/6/2026
4h 23m
No alerts
Replay Analysis
N14118BOEING Boeing 757-200
→
8/6/2026
1h 20m
No alerts
Replay Analysis
N14118BOEING Boeing 757-200
→
8/5/2026
53m
No alerts
Replay Analysis
N14118BOEING Boeing 757-200
→
8/5/2026
2h 14m
No alerts
Replay Analysis
N15751BOEING Boeing 737-700
→
8/5/2026
5h 13m
No alerts
Replay Analysis
N24542AIRBUS Airbus A321 Neo
→
8/5/2026
4h 34m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
8/5/2026
12m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
8/5/2026
1h 2m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
8/4/2026
1h 47m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
8/4/2026
2h 50m
No alerts
Replay Analysis
N14735BOEING Boeing 737-700
→
8/4/2026
5h 25m
No alerts
Replay Analysis
N33714BOEING Boeing 737-700
→
8/3/2026
4h 7m
No alerts
Replay Analysis
N14102BOEING Boeing 757-200
→
8/2/2026
2h 49m
No alerts
Replay Analysis
N27734BOEING Boeing 737-700
→
8/1/2026
1h 24m
No alerts
Replay Analysis
N14541AIRBUS Airbus A321 Neo
→
8/1/2026
4h 13m
No alerts
Replay Analysis
N13113BOEING Boeing 757-200
→
7/31/2026
13m
No alerts
Replay Analysis
N13113BOEING Boeing 757-200
→
7/31/2026
2h 34m
No alerts
Replay Analysis
N25705BOEING Boeing 737-700
→
7/31/2026
5h 25m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window