Flight Status & Tracker

UAL639

UNITED AIRLINES INC · BOS → LAX · Last tracked Sep 25, 2026

UAL639 is a flight number operated by UNITED AIRLINES INC between General Edward Lawrence Logan International Airport (KBOS) and Los Angeles International Airport (KLAX). SkyMeter last tracked UAL639 on September 24, 2026. The flight is most often flown by a BOEING Boeing 737 MAX 9. Typical block time is 4h 11m. SkyMeter has observed 79 legs of this flight number via ADS-B.

SkyMeter tracks historical flight activity from ADS-B data — this is not a live gate-to-gate status feed.

✈
FLIGHTS
79
last 90 days
⏱
AVG DURATION
4h 11m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 9/25/2026
first → last seen
🗺
ROUTES / TYPES
7 / 5
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

4
KBOS → KLAX
44
avg 5h 53m · General Edward Lawrence Logan → Los Angeles
KRNO → KSFO
21
avg 1h 18m · Reno Tahoe → San Francisco
KSFO → KSAT
5
avg 3h 43m · San Francisco → San Antonio
KSFO → KCMH
1
avg 5h 0m · San Francisco → John Glenn Columbus

Aircraft types

Equipment used on this number

5
B39M BOEING Boeing 737 MAX 9
108
A320 AIRBUS Airbus A320
23
B738 BOEING Boeing 737-800
3
A319 AIRBUS Airbus A319
2
B739 BOEING Boeing 737-900
2

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
N77426BOEING Boeing 737 MAX 9
→
9/25/2026
45m
No alerts
Replay Analysis
N464UAAIRBUS Airbus A320
→
9/23/2026
3h 54m
No alerts
Replay Analysis
N37506BOEING Boeing 737 MAX 9
→
9/22/2026
5h 26m
No alerts
Replay Analysis
N37506BOEING Boeing 737 MAX 9
→
9/22/2026
6h 16m
No alerts
Replay Analysis
N37506BOEING Boeing 737 MAX 9
→
9/22/2026
49m
No alerts
Replay Analysis
N77543BOEING Boeing 737 MAX 9
→
9/21/2026
5h 58m
No alerts
Replay Analysis
N490UAAIRBUS Airbus A320
→
9/19/2026
3h 34m
No alerts
Replay Analysis
N77558BOEING Boeing 737 MAX 9
→
9/19/2026
5h 45m
No alerts
Replay Analysis
N77558BOEING Boeing 737 MAX 9
→
9/19/2026
24m
No alerts
Replay Analysis
N77558BOEING Boeing 737 MAX 9
→
9/19/2026
6h 10m
No alerts
Replay Analysis
N17529BOEING Boeing 737 MAX 9
→
9/18/2026
5h 52m
No alerts
Replay Analysis
N467UAAIRBUS Airbus A320
→
9/16/2026
3h 38m
No alerts
Replay Analysis
N77582BOEING Boeing 737 MAX 9
→
9/15/2026
5h 29m
No alerts
Replay Analysis
N77582BOEING Boeing 737 MAX 9
→
9/15/2026
39m
No alerts
Replay Analysis
N77582BOEING Boeing 737 MAX 9
→
9/15/2026
6h 9m
No alerts
Replay Analysis
N37514BOEING Boeing 737 MAX 9
→
9/14/2026
5h 58m
No alerts
Replay Analysis
N454UAAIRBUS Airbus A320
→
9/12/2026
3h 28m
No alerts
Replay Analysis
N37522BOEING Boeing 737 MAX 9
→
9/12/2026
5h 47m
No alerts
Replay Analysis
N37445BOEING Boeing 737 MAX 9
→
9/11/2026
5h 43m
No alerts
Replay Analysis
N466UAAIRBUS Airbus A320
→
9/9/2026
4h 1m
No alerts
Replay Analysis
N447UAAIRBUS Airbus A320
→
9/5/2026
52m
No alerts
Replay Analysis
N447UAAIRBUS Airbus A320
→
9/5/2026
56m
No alerts
Replay Analysis
N452UAAIRBUS Airbus A320
→
9/4/2026
1h 31m
No alerts
Replay Analysis
N479UAAIRBUS Airbus A320
→
9/3/2026
1h 8m
No alerts
Replay Analysis
N76515BOEING Boeing 737-800
→
9/2/2026
1h 25m
No alerts
Replay Analysis
N472UAAIRBUS Airbus A320
→
8/31/2026
1h 39m
No alerts
Replay Analysis
N482UAAIRBUS Airbus A320
→
8/30/2026
1h 3m
No alerts
Replay Analysis
N482UAAIRBUS Airbus A320
→
8/30/2026
7m
No alerts
Replay Analysis
N1902UAIRBUS Airbus A320
→
8/29/2026
56m
No alerts
Replay Analysis
N453UAAIRBUS Airbus A320
→
8/28/2026
1h 25m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window