Flight Status & Tracker

UAL3900

UNITED AIRLINES INC · SFO → LAX · Last tracked Oct 21, 2026

UAL3900 is a flight number operated by UNITED AIRLINES INC between San Francisco International Airport (KSFO) and Los Angeles International Airport (KLAX). SkyMeter last tracked UAL3900 on October 21, 2026. The flight is most often flown by a BOEING Boeing 757-200. Typical block time is 3h 59m. SkyMeter has observed 38 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
38
last 90 days
⏱
AVG DURATION
3h 59m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 10/21/2026
first → last seen
🗺
ROUTES / TYPES
31 / 10
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

10
KDEN → KIAH
2
avg 2h 6m · Denver → George Bush Intercontinental Houston
KLAX → KSFO
2
avg 1h 19m · Los Angeles → San Francisco
KSFO → KLAX
2
avg 1h 21m · San Francisco → Los Angeles
KEWR → KDEN
1
avg 4h 9m · Newark Liberty → Denver
EHAM → KEWR
1
avg 8h 5m · Amsterdam Airport Schiphol → Newark Liberty
EGLL → KEWR
1
avg 8h 11m · London Heathrow → Newark Liberty
EIDW → KEWR
1
avg 7h 36m · Dublin → Newark Liberty
KLAX → KEWR
1
avg 4h 58m · Los Angeles → Newark Liberty
KOMA → KDEN
1
avg 1h 27m · Eppley Airfield → Denver
KIAH → KSFO
1
avg 3h 41m · George Bush Intercontinental Houston → San Francisco

Aircraft types

Equipment used on this number

10
B752 BOEING Boeing 757-200
7
B763 BOEING Boeing 767-300
7
B789 BOEING Boeing 787-9 Dreamliner
5
B772 BOEING Boeing 777-200
4
B764 BOEING Boeing 767-400
4
B77W BOEING Boeing 777-300ER
3
A320 AIRBUS Airbus A320
2
A319 AIRBUS Airbus A319
2
B738 BOEING Boeing 737-800
2
B753 BOEING Boeing 757-300
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 UAL3900

30
N66056BOEING Boeing 767-400
→
10/21/2026
8h 59m
No alerts
Replay Analysis
N29984BOEING Boeing 787-9 Dreamliner
→
10/20/2026
8h 11m
No alerts
Replay Analysis
N222UABOEING Boeing 777-200
→
10/19/2026
10h 20m
No alerts
Replay Analysis
N69059BOEING Boeing 767-400
→
10/13/2026
8h 4m
No alerts
Replay Analysis
N27959BOEING Boeing 787-9 Dreamliner
→
10/3/2026
4h 57m
No alerts
Replay Analysis
N75861BOEING Boeing 757-300
→
10/3/2026
2h 2m
No alerts
Replay Analysis
N660UABOEING Boeing 767-300
→
9/29/2026
1h 52m
No alerts
Replay Analysis
N660UABOEING Boeing 767-300
→
9/28/2026
21m
No alerts
Replay Analysis
N674UABOEING Boeing 767-300
→
9/25/2026
7h 38m
No alerts
Replay Analysis
N436UAAIRBUS Airbus A320
→
9/24/2026
44m
No alerts
Replay Analysis
N37422BOEING Boeing 737-900
→
9/22/2026
1h 26m
No alerts
Replay Analysis
N23707BOEING Boeing 737-700
→
9/20/2026
1h 57m
No alerts
Replay Analysis
N22992BOEING Boeing 787-9 Dreamliner
→
9/19/2026
1h 32m
No alerts
Replay Analysis
N22992BOEING Boeing 787-9 Dreamliner
→
9/18/2026
2h 46m
No alerts
Replay Analysis
N22992BOEING Boeing 787-9 Dreamliner
→
9/18/2026
6m
No alerts
Replay Analysis
N19136BOEING Boeing 757-200
→
9/17/2026
13m
No alerts
Replay Analysis
N19136BOEING Boeing 757-200
→
9/16/2026
8h 10m
No alerts
Replay Analysis
N19136BOEING Boeing 757-200
→
9/16/2026
7h 57m
No alerts
Replay Analysis
N19130BOEING Boeing 757-200
→
9/14/2026
7h 35m
No alerts
Replay Analysis
N47275BOEING Boeing 737 MAX 8
→
9/11/2026
1h 19m
No alerts
Replay Analysis
N641UABOEING Boeing 767-300
→
9/9/2026
8h 45m
No alerts
Replay Analysis
N779UABOEING Boeing 777-200
→
9/8/2026
18m
No alerts
Replay Analysis
N76064BOEING Boeing 767-400
→
9/3/2026
9h 14m
No alerts
Replay Analysis
N76055BOEING Boeing 767-400
→
9/2/2026
59m
No alerts
Replay Analysis
N78001BOEING Boeing 777-200
→
9/1/2026
3h 41m
No alerts
Replay Analysis
N649UABOEING Boeing 767-300
→
8/31/2026
9h 3m
No alerts
Replay Analysis
N12012BOEING Boeing 787-10 Dreamliner
→
8/30/2026
3h 50m
No alerts
Replay Analysis
N73256BOEING Boeing 737-800
→
8/29/2026
3h 3m
No alerts
Replay Analysis
N781UABOEING Boeing 777-200
→
8/23/2026
1h 23m
No alerts
Replay Analysis
N465UAAIRBUS Airbus A320
→
8/22/2026
2h 16m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window