UAL3909

UNITED AIRLINES INC · DEN → SFO

UAL3909 is operated by UNITED AIRLINES INC between Denver International Airport (KDEN) and San Francisco International Airport (KSFO). The flight is most often flown by a BOEING Boeing 737-800. Typical block time is 2h 38m. SkyMeter has observed 9 legs of this flight number via ADS-B.

✈
FLIGHTS
9
last 90 days
⏱
AVG DURATION
2h 38m
tracked time
📅
SERVICE PERIOD
04/18/2026 → 06/01/2026
first → last seen
🗺
ROUTES / TYPES
7 / 7
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

4
KDEN → KSFO
2
avg 2h 25m · Denver → San Francisco
EGLL → KEWR
1
avg 7h 31m · London Heathrow → Newark Liberty
KMCI → KORD
1
avg 1h 3m · Kansas City → Chicago O'Hare
KORD → KMKE
1
avg 22m · Chicago O'Hare → General Mitchell

Aircraft types

Equipment used on this number

7
B738 BOEING Boeing 737-800
2
B772 BOEING Boeing 777-200
2
B763 BOEING Boeing 767-300
1
A320 AIRBUS Airbus A320
1
B752 BOEING Boeing 757-200
1
B38M BOEING Boeing 737 MAX 8
1
B789 BOEING Boeing 787-9 Dreamliner
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 9 operations of UAL3909

9
N786UABOEING Boeing 777-200
→
06/01/2026
3h 11m
No alerts
Replay Analysis
N786UABOEING Boeing 777-200
→
06/01/2026
3h 15m
No alerts
Replay Analysis
N12114BOEING Boeing 757-200
→
05/21/2026
2h 18m
No alerts
Replay Analysis
N27253BOEING Boeing 737 MAX 8
→
05/20/2026
2h 36m
No alerts
Replay Analysis
N665UABOEING Boeing 767-300
→
05/18/2026
7h 31m
No alerts
Replay Analysis
N27959BOEING Boeing 787-9 Dreamliner
→
05/16/2026
2h 32m
No alerts
Replay Analysis
N77542BOEING Boeing 737-800
→
05/08/2026
21m
No alerts
Replay Analysis
N484UAAIRBUS Airbus A320
→
04/23/2026
59m
No alerts
Replay Analysis
N18220BOEING Boeing 737-800
→
04/18/2026
1h 2m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window