UAL639 is operated by UNITED AIRLINES INC between General Edward Lawrence Logan International Airport (KBOS) and Los Angeles International Airport (KLAX). The flight is most often flown by a BOEING Boeing 737 MAX 9. Typical block time is 5h 47m. SkyMeter has observed 90 legs of this flight number via ADS-B.

✈
FLIGHTS
90
last 90 days
⏱
AVG DURATION
5h 47m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 8/12/2026
first → last seen
🗺
ROUTES / TYPES
10 / 3
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

8
KBOS → KLAX
78
avg 6h 1m · General Edward Lawrence Logan → Los Angeles
KBOS → KBUR
1
avg 6h 0m · General Edward Lawrence Logan → Bob Hope
KRNO → KSFO
1
avg 1h 32m · Reno Tahoe → San Francisco
KONT → KLAX
1
avg 1h 6m · Ontario → Los Angeles
3MA7 → KLAX
1
avg 6h 17m · Gear Plant Heliport → Los Angeles
KBOS → KONT
1
avg 6h 55m · General Edward Lawrence Logan → Ontario
KSFO → KCMH
1
avg 5h 0m · San Francisco → John Glenn Columbus
US-0568 → KLAX
1
avg 5h 35m · Tailwind Boston Seaplane Base → Los Angeles

Aircraft types

Equipment used on this number

3
B39M BOEING Boeing 737 MAX 9
216
B739 BOEING Boeing 737-900
6
A319 AIRBUS Airbus A319
1

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 UAL639

30
N37420BOEING Boeing 737-900
→
8/12/2026
1h 31m
No alerts
Replay Analysis
N77559BOEING Boeing 737 MAX 9
→
8/11/2026
4h 55m
No alerts
Replay Analysis
N77559BOEING Boeing 737 MAX 9
→
8/10/2026
5h 51m
No alerts
Replay Analysis
N77559BOEING Boeing 737 MAX 9
→
8/10/2026
55m
No alerts
Replay Analysis
N37548BOEING Boeing 737 MAX 9
→
8/10/2026
5h 2m
No alerts
Replay Analysis
N37548BOEING Boeing 737 MAX 9
→
8/9/2026
40m
No alerts
Replay Analysis
N37548BOEING Boeing 737 MAX 9
→
8/9/2026
5h 43m
No alerts
Replay Analysis
N97424BOEING Boeing 737 MAX 9
→
8/9/2026
5h 50m
No alerts
Replay Analysis
N17566BOEING Boeing 737 MAX 9
→
8/8/2026
5h 9m
No alerts
Replay Analysis
N17566BOEING Boeing 737 MAX 9
→
8/7/2026
1h 9m
No alerts
Replay Analysis
N17566BOEING Boeing 737 MAX 9
→
8/7/2026
6h 19m
No alerts
Replay Analysis
N17460BOEING Boeing 737 MAX 9
→
8/7/2026
5h 0m
No alerts
Replay Analysis
N17460BOEING Boeing 737 MAX 9
→
8/6/2026
41m
No alerts
Replay Analysis
N17460BOEING Boeing 737 MAX 9
→
8/6/2026
5h 42m
No alerts
Replay Analysis
N17431BOEING Boeing 737 MAX 9
→
8/6/2026
5h 2m
No alerts
Replay Analysis
N17431BOEING Boeing 737 MAX 9
→
8/5/2026
6h 11m
No alerts
Replay Analysis
N17431BOEING Boeing 737 MAX 9
→
8/5/2026
1h 8m
No alerts
Replay Analysis
N37450BOEING Boeing 737 MAX 9
→
8/5/2026
4h 55m
No alerts
Replay Analysis
N37450BOEING Boeing 737 MAX 9
→
8/4/2026
46m
No alerts
Replay Analysis
N37450BOEING Boeing 737 MAX 9
→
8/4/2026
5h 42m
No alerts
Replay Analysis
N27539BOEING Boeing 737 MAX 9
→
8/4/2026
5h 40m
No alerts
Replay Analysis
N17435BOEING Boeing 737 MAX 9
→
8/3/2026
5h 40m
No alerts
Replay Analysis
N38417BOEING Boeing 737-900
→
8/2/2026
3h 45m
No alerts
Replay Analysis
N17408BOEING Boeing 737 MAX 9
→
8/1/2026
5h 21m
No alerts
Replay Analysis
N17408BOEING Boeing 737 MAX 9
→
7/31/2026
19m
No alerts
Replay Analysis
N17408BOEING Boeing 737 MAX 9
→
7/31/2026
5h 41m
No alerts
Replay Analysis
N37445BOEING Boeing 737 MAX 9
→
7/31/2026
5h 15m
No alerts
Replay Analysis
N37445BOEING Boeing 737 MAX 9
→
7/30/2026
32m
No alerts
Replay Analysis
N37445BOEING Boeing 737 MAX 9
→
7/30/2026
5h 48m
No alerts
Replay Analysis
N17557BOEING Boeing 737 MAX 9
→
7/30/2026
5h 37m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window