Flight Status & Tracker

UAL399

UNITED AIRLINES INC · KEF → IAD · Last tracked Oct 18, 2026

UAL399 is a flight number operated by UNITED AIRLINES INC between Keflavik International Airport (BIKF) and Washington Dulles International Airport (KIAD). SkyMeter last tracked UAL399 on October 18, 2026. The flight is most often flown by a BOEING Boeing 757-200. Typical block time is 5h 8m. SkyMeter has observed 78 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
78
last 90 days
⏱
AVG DURATION
5h 8m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 10/18/2026
first → last seen
🗺
ROUTES / TYPES
7 / 3
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

4
BIKF → KIAD
31
avg 6h 0m · Keflavik → Washington Dulles
KJAX → KEWR
14
avg 1h 52m · Jacksonville → Newark Liberty
FL84 → KEWR
3
avg 1h 53m · Flying-A-Ranch → Newark Liberty
KORD → KIAD
1
avg 14h 41m · Chicago O'Hare → Washington Dulles

Aircraft types

Equipment used on this number

3
B752 BOEING Boeing 757-200
57
B39M BOEING Boeing 737 MAX 9
19
B753 BOEING Boeing 757-300
3

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
N17566BOEING Boeing 737 MAX 9
→
10/18/2026
2h 1m
No alerts
Replay Analysis
N17435BOEING Boeing 737 MAX 9
→
10/16/2026
1h 52m
No alerts
Replay Analysis
N77571BOEING Boeing 737 MAX 9
→
10/15/2026
2h 1m
No alerts
Replay Analysis
N77426BOEING Boeing 737 MAX 9
→
10/10/2026
1h 40m
No alerts
Replay Analysis
N77426BOEING Boeing 737 MAX 9
→
10/9/2026
1h 48m
No alerts
Replay Analysis
N17479
→
10/8/2026
1h 58m
No alerts
Replay Analysis
N57451BOEING Boeing 737 MAX 9
→
10/7/2026
1h 48m
No alerts
Replay Analysis
N27520BOEING Boeing 737 MAX 9
→
10/6/2026
1h 42m
No alerts
Replay Analysis
N77471BOEING Boeing 737 MAX 9
→
10/6/2026
1h 43m
No alerts
Replay Analysis
N77471BOEING Boeing 737 MAX 9
→
10/6/2026
12m
No alerts
Replay Analysis
N77471BOEING Boeing 737 MAX 9
→
10/6/2026
1h 56m
No alerts
Replay Analysis
N27464BOEING Boeing 737 MAX 9
→
10/4/2026
1h 48m
No alerts
Replay Analysis
N17591BOEING Boeing 737 MAX 9
→
10/3/2026
1h 54m
No alerts
Replay Analysis
N27439BOEING Boeing 737 MAX 9
→
10/2/2026
1h 45m
No alerts
Replay Analysis
N17557BOEING Boeing 737 MAX 9
→
10/1/2026
1h 55m
No alerts
Replay Analysis
N77588BOEING Boeing 737 MAX 9
→
9/30/2026
1h 57m
No alerts
Replay Analysis
N27511BOEING Boeing 737 MAX 9
→
9/29/2026
1h 57m
No alerts
Replay Analysis
N17427BOEING Boeing 737 MAX 9
→
9/28/2026
1h 46m
No alerts
Replay Analysis
N77587BOEING Boeing 737 MAX 9
→
9/25/2026
2h 34m
No alerts
Replay Analysis
N77592BOEING Boeing 737 MAX 9
→
9/24/2026
1h 55m
No alerts
Replay Analysis
N48127BOEING Boeing 757-200
→
9/23/2026
6h 9m
No alerts
Replay Analysis
N19130BOEING Boeing 757-200
→
9/22/2026
5h 55m
No alerts
Replay Analysis
N12125BOEING Boeing 757-200
→
9/21/2026
6h 11m
No alerts
Replay Analysis
N18119BOEING Boeing 757-200
→
9/20/2026
6h 10m
No alerts
Replay Analysis
N29129BOEING Boeing 757-200
→
9/19/2026
5h 49m
No alerts
Replay Analysis
N34137BOEING Boeing 757-200
→
9/18/2026
6h 2m
No alerts
Replay Analysis
N12125BOEING Boeing 757-200
→
9/17/2026
6h 14m
No alerts
Replay Analysis
N41140BOEING Boeing 757-200
→
9/16/2026
6h 12m
No alerts
Replay Analysis
N14115BOEING Boeing 757-200
→
9/15/2026
6h 7m
No alerts
Replay Analysis
N41140BOEING Boeing 757-200
→
9/14/2026
6h 7m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window