UAL399 is operated by UNITED AIRLINES INC between George Bush Intercontinental Houston Airport (KIAH) and San Francisco International Airport (KSFO). The flight is most often flown by a BOEING Boeing 757-200. Typical block time is 4h 8m. SkyMeter has observed 118 legs of this flight number via ADS-B.

✈
FLIGHTS
118
last 90 days
⏱
AVG DURATION
4h 8m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 07/18/2026
first → last seen
🗺
ROUTES / TYPES
13 / 7
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

8
KIAH → KSFO
17
avg 3h 51m · George Bush Intercontinental Houston → San Francisco
KDFW → KIAH
16
avg 49m · Dallas Fort Worth → George Bush Intercontinental Houston
KORD → KDFW
14
avg 2h 8m · Chicago O'Hare → Dallas Fort Worth
KORD → KIAD
7
avg 14h 43m · Chicago O'Hare → Washington Dulles
BIKF → KIAD
7
avg 6h 3m · Keflavik → Washington Dulles
KEWR → KMSY
7
avg 2h 59m · Newark Liberty → Louis Armstrong New Orleans
KOKC → KDFW
1
avg 1h 8m · Will Rogers World → Dallas Fort Worth
KORD → KOKC
1
avg 3h 7m · Chicago O'Hare → Will Rogers World

Aircraft types

Equipment used on this number

7
B752 BOEING Boeing 757-200
55
A320 AIRBUS Airbus A320
19
A319 AIRBUS Airbus A319
18
B39M BOEING Boeing 737 MAX 9
14
B38M BOEING Boeing 737 MAX 8
7
B739 BOEING Boeing 737-900
4
B738 BOEING Boeing 737-800
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 UAL399

30
N14102BOEING Boeing 757-200
→
07/18/2026
6h 39m
No alerts
Replay Analysis
N14120BOEING Boeing 757-200
→
07/17/2026
5h 49m
No alerts
Replay Analysis
N14120BOEING Boeing 757-200
→
07/16/2026
5h 51m
No alerts
Replay Analysis
N13110BOEING Boeing 757-200
→
07/15/2026
6h 3m
No alerts
Replay Analysis
N29124BOEING Boeing 757-200
→
07/14/2026
5h 58m
No alerts
Replay Analysis
N34131BOEING Boeing 757-200
→
07/13/2026
5h 51m
No alerts
Replay Analysis
N14121BOEING Boeing 757-200
→
07/12/2026
5h 55m
No alerts
Replay Analysis
N12114BOEING Boeing 757-200
→
07/11/2026
5h 50m
No alerts
Replay Analysis
N17105BOEING Boeing 757-200
→
07/10/2026
6h 2m
No alerts
Replay Analysis
N19136BOEING Boeing 757-200
→
07/09/2026
6h 26m
No alerts
Replay Analysis
N58101BOEING Boeing 757-200
→
07/08/2026
5h 57m
No alerts
Replay Analysis
N19136BOEING Boeing 757-200
→
07/07/2026
5h 42m
No alerts
Replay Analysis
N41140BOEING Boeing 757-200
→
07/05/2026
5h 38m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
07/04/2026
6h 13m
No alerts
Replay Analysis
N41140BOEING Boeing 757-200
→
07/03/2026
5h 57m
No alerts
Replay Analysis
N41140BOEING Boeing 757-200
→
07/02/2026
5h 52m
No alerts
Replay Analysis
N14120BOEING Boeing 757-200
→
07/01/2026
5h 44m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
06/30/2026
5h 36m
No alerts
Replay Analysis
N19141BOEING Boeing 757-200
→
06/29/2026
5h 47m
No alerts
Replay Analysis
N13110BOEING Boeing 757-200
→
06/28/2026
5h 52m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
06/27/2026
5h 52m
No alerts
Replay Analysis
N14107BOEING Boeing 757-200
→
06/26/2026
5h 56m
No alerts
Replay Analysis
N14107BOEING Boeing 757-200
→
06/25/2026
5h 57m
No alerts
Replay Analysis
N34131BOEING Boeing 757-200
→
06/24/2026
5h 55m
No alerts
Replay Analysis
N12114BOEING Boeing 757-200
→
06/23/2026
6h 5m
No alerts
Replay Analysis
N18112BOEING Boeing 757-200
→
06/22/2026
6h 3m
No alerts
Replay Analysis
N17128BOEING Boeing 757-200
→
06/21/2026
5h 55m
No alerts
Replay Analysis
N13110BOEING Boeing 757-200
→
06/20/2026
5h 49m
No alerts
Replay Analysis
N41135BOEING Boeing 757-200
→
06/18/2026
5h 59m
No alerts
Replay Analysis
N14102BOEING Boeing 757-200
→
06/17/2026
5h 49m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window