UAL399 is operated by UNITED AIRLINES INC between Keflavik International Airport (BIKF) and Washington Dulles International Airport (KIAD). The flight is most often flown by a BOEING Boeing 757-200. Typical block time is 6h 21m. SkyMeter has observed 85 legs of this flight number via ADS-B.

✈
FLIGHTS
85
last 90 days
⏱
AVG DURATION
6h 21m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 08/20/2026
first → last seen
🗺
ROUTES / TYPES
4 / 1
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

2
BIKF → KIAD
13
avg 6h 4m · Keflavik → Washington Dulles
KORD → KIAD
8
avg 14h 42m · Chicago O'Hare → Washington Dulles

Aircraft types

Equipment used on this number

1
B752 BOEING Boeing 757-200
85

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
N18112BOEING Boeing 757-200
→
08/20/2026
6h 12m
No alerts
Replay Analysis
N13113BOEING Boeing 757-200
→
08/19/2026
6h 3m
No alerts
Replay Analysis
N18112BOEING Boeing 757-200
→
08/18/2026
5h 56m
No alerts
Replay Analysis
N18112BOEING Boeing 757-200
→
08/17/2026
5h 53m
No alerts
Replay Analysis
N14102BOEING Boeing 757-200
→
08/16/2026
5h 47m
No alerts
Replay Analysis
N29124BOEING Boeing 757-200
→
08/15/2026
5h 49m
No alerts
Replay Analysis
N17126BOEING Boeing 757-200
→
08/14/2026
5h 58m
No alerts
Replay Analysis
N48127BOEING Boeing 757-200
→
08/13/2026
5h 55m
No alerts
Replay Analysis
N18112BOEING Boeing 757-200
→
08/12/2026
5h 53m
No alerts
Replay Analysis
N12114BOEING Boeing 757-200
→
08/10/2026
6h 2m
No alerts
Replay Analysis
N41140BOEING Boeing 757-200
→
08/09/2026
5m
No alerts
Replay Analysis
N33132BOEING Boeing 757-200
→
08/08/2026
6h 21m
No alerts
Replay Analysis
N29129BOEING Boeing 757-200
→
08/07/2026
6h 6m
No alerts
Replay Analysis
N14118BOEING Boeing 757-200
→
08/06/2026
6h 1m
No alerts
Replay Analysis
N17122BOEING Boeing 757-200
→
08/05/2026
5h 46m
No alerts
Replay Analysis
N58101BOEING Boeing 757-200
→
08/04/2026
1h 59m
No alerts
Replay Analysis
N33132BOEING Boeing 757-200
→
08/03/2026
14h 34m
No alerts
Replay Analysis
N34131BOEING Boeing 757-200
→
08/02/2026
14h 53m
No alerts
Replay Analysis
N29129BOEING Boeing 757-200
→
08/01/2026
16m
No alerts
Replay Analysis
N17126BOEING Boeing 757-200
→
07/31/2026
14h 40m
No alerts
Replay Analysis
N12116BOEING Boeing 757-200
→
07/30/2026
2h 8m
No alerts
Replay Analysis
N67134BOEING Boeing 757-200
→
07/29/2026
5h 51m
No alerts
Replay Analysis
N13113BOEING Boeing 757-200
→
07/28/2026
6h 9m
No alerts
Replay Analysis
N18112BOEING Boeing 757-200
→
07/27/2026
5h 40m
No alerts
Replay Analysis
N18112BOEING Boeing 757-200
→
07/26/2026
5h 52m
No alerts
Replay Analysis
N13113BOEING Boeing 757-200
→
07/25/2026
5h 46m
No alerts
Replay Analysis
N58101BOEING Boeing 757-200
→
07/24/2026
6h 9m
No alerts
Replay Analysis
N67134BOEING Boeing 757-200
→
07/23/2026
6h 31m
No alerts
Replay Analysis
N48127BOEING Boeing 757-200
→
07/22/2026
6h 12m
No alerts
Replay Analysis
N48127BOEING Boeing 757-200
→
07/21/2026
6h 3m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window