UAL939 is operated by UNITED AIRLINES INC. between London Heathrow Airport (EGLL) and San Francisco International Airport (KSFO). The flight is most often flown by a BOEING Boeing 787-9 Dreamliner. Typical block time is 9h 32m. SkyMeter has observed 88 legs of this flight number via ADS-B.

✈
FLIGHTS
88
last 90 days
⏱
AVG DURATION
9h 32m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 07/19/2026
first → last seen
🗺
ROUTES / TYPES
6 / 2
city pairs · airframes
⚠
INCIDENT RATE
1.1%
1 flagged

Routes flown

By count · last 90 days

4
EGLL → KSFO
68
avg 10h 46m · London Heathrow → San Francisco
EGLL → EGLM
2
avg 8h 40m · London Heathrow → White Waltham Airfield
EGLL → EGTR
1
avg 8h 28m · London Heathrow → Elstree Airfield
US-0188 → KSFO
1
avg 2h 13m · Coast Guard Air Station San Francisco → San Francisco

Aircraft types

Equipment used on this number

2
B789 BOEING Boeing 787-9 Dreamliner
163
B772 BOEING Boeing 777-200
64

Safety profile

Flagged flights · last 90 days

Go-arounds
1
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 UAL939

30
N21102BOEING Boeing 787-9 Dreamliner
→
07/19/2026
8h 36m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/19/2026
2h 13m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/18/2026
8h 44m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/18/2026
10h 58m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/18/2026
1h 39m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/17/2026
10h 24m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/17/2026
8h 44m
No alerts
Replay Analysis
N61103BOEING Boeing 787-9 Dreamliner
→
07/17/2026
2h 12m
No alerts
Replay Analysis
N61103BOEING Boeing 787-9 Dreamliner
→
07/16/2026
8h 43m
No alerts
Replay Analysis
N81105BOEING Boeing 787-9 Dreamliner
→
07/16/2026
2h 37m
No alerts
Replay Analysis
N81105BOEING Boeing 787-9 Dreamliner
→
07/15/2026
8h 28m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/15/2026
2h 31m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/14/2026
11h 5m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/14/2026
8h 33m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/14/2026
3h 48m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/13/2026
11h 39m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/13/2026
7h 50m
No alerts
Replay Analysis
N61103BOEING Boeing 787-9 Dreamliner
→
07/13/2026
2h 23m
No alerts
Replay Analysis
N61103BOEING Boeing 787-9 Dreamliner
→
07/12/2026
8h 37m
No alerts
Replay Analysis
N61103BOEING Boeing 787-9 Dreamliner
→
07/12/2026
11h 0m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/12/2026
2h 30m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/11/2026
8h 52m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/11/2026
11h 23m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/11/2026
2h 14m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/10/2026
11h 1m
No alerts
Replay Analysis
N61106BOEING Boeing 787-9 Dreamliner
→
07/10/2026
8h 27m
No alerts
Replay Analysis
N21102BOEING Boeing 787-9 Dreamliner
→
07/10/2026
2h 5m
No alerts
Replay Analysis
N21102BOEING Boeing 787-9 Dreamliner
→
07/09/2026
8h 40m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/09/2026
1h 48m
No alerts
Replay Analysis
N51104BOEING Boeing 787-9 Dreamliner
→
07/08/2026
10h 17m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window