UAL3909 is operated by WILMINGTON TRUST CO TRUSTEE between San Francisco International Airport (KSFO) and Denver International Airport (KDEN). The flight is most often flown by a BOEING Boeing 737-900. Typical block time is 3h 17m. SkyMeter has observed 28 legs of this flight number via ADS-B.

✈
FLIGHTS
28
last 90 days
⏱
AVG DURATION
3h 17m
tracked time
📅
SERVICE PERIOD
05/30/2025 → 08/16/2026
first → last seen
🗺
ROUTES / TYPES
27 / 10
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

10
KSFO → KDEN
2
avg 2h 55m · San Francisco → Denver
KORD → KIAD
1
avg 1h 25m · Chicago O'Hare → Washington Dulles
LSGG → KEWR
1
avg 8h 46m · Geneva Cointrin → Newark Liberty
PHNL → KIAD
1
avg 8h 43m · Daniel K Inouye → Washington Dulles
EDDF → KIAD
1
avg 8h 35m · Frankfurt am Main → Washington Dulles
KDEN → KSFO
1
avg 2h 34m · Denver → San Francisco
KIAH → KSFO
1
avg 3h 41m · George Bush Intercontinental Houston → San Francisco
KRFD → KSFO
1
avg 4h 39m · Chicago Rockford → San Francisco
KTPA → KORD
1
avg 2h 32m · Tampa → Chicago O'Hare
KCLE → KORD
1
avg 52m · Cleveland Hopkins → Chicago O'Hare

Aircraft types

Equipment used on this number

10
B739 BOEING Boeing 737-900
7
B772 BOEING Boeing 777-200
5
B39M BOEING Boeing 737 MAX 9
5
A21N AIRBUS Airbus A321 Neo
4
B763 BOEING Boeing 767-300
4
B38M BOEING Boeing 737 MAX 8
3
A319 AIRBUS Airbus A319
3
B738 BOEING Boeing 737-800
3
B752 BOEING Boeing 757-200
2
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 30 operations of UAL3909

30
N87507BOEING Boeing 737-800
→
08/16/2026
50m
No alerts
Replay Analysis
N37263BOEING Boeing 737-800
→
08/14/2026
2h 32m
No alerts
Replay Analysis
N213UABOEING Boeing 777-200
→
08/12/2026
1h 25m
No alerts
Replay Analysis
N21723BOEING Boeing 737-700
→
08/10/2026
32m
No alerts
Replay Analysis
N37462BOEING Boeing 737-900
→
08/07/2026
52m
No alerts
Replay Analysis
N29971BOEING Boeing 787-9 Dreamliner
→
08/03/2026
4h 37m
No alerts
Replay Analysis
N17406BOEING Boeing 737 MAX 9
→
08/01/2026
1h 4m
No alerts
Replay Analysis
N37319BOEING Boeing 737 MAX 8
→
07/29/2026
3h 55m
No alerts
Replay Analysis
N37319BOEING Boeing 737 MAX 8
→
07/28/2026
43m
No alerts
Replay Analysis
N37319BOEING Boeing 737 MAX 8
→
07/28/2026
4h 39m
No alerts
Replay Analysis
N26910BOEING Boeing 787-8 BBJ/Dreamliner
→
07/28/2026
8h 43m
No alerts
Replay Analysis
N24224BOEING Boeing 737-800
→
07/25/2026
1h 2m
No alerts
Replay Analysis
N78001BOEING Boeing 777-200
→
07/23/2026
1h 11m
No alerts
Replay Analysis
N78001BOEING Boeing 777-200
→
07/22/2026
7h 23m
No alerts
Replay Analysis
N78001BOEING Boeing 777-200
→
07/22/2026
8h 35m
No alerts
Replay Analysis
N14102BOEING Boeing 757-200
→
07/22/2026
2h 42m
No alerts
Replay Analysis
N14102BOEING Boeing 757-200
→
07/21/2026
52m
No alerts
Replay Analysis
N69804BOEING Boeing 737-900
→
07/12/2026
37m
No alerts
Replay Analysis
N655UABOEING Boeing 767-300
→
07/11/2026
10h 13m
No alerts
Replay Analysis
N895UAAIRBUS Airbus A319
→
07/07/2026
2h 33m
No alerts
Replay Analysis
N62889BOEING Boeing 737-900
→
07/05/2026
3h 40m
No alerts
Replay Analysis
N54525AIRBUS Airbus A321 Neo
→
07/04/2026
2h 48m
No alerts
Replay Analysis
N47434BOEING Boeing 737 MAX 9
→
07/02/2026
1h 3m
No alerts
Replay Analysis
N652UABOEING Boeing 767-300
→
07/02/2026
44m
No alerts
Replay Analysis
N652UABOEING Boeing 767-300
→
07/01/2026
8h 46m
No alerts
Replay Analysis
N652UABOEING Boeing 767-300
→
07/01/2026
8h 1m
No alerts
Replay Analysis
N37555BOEING Boeing 737 MAX 9
→
06/28/2026
1h 11m
No alerts
Replay Analysis
N37555BOEING Boeing 737 MAX 9
→
06/27/2026
2h 7m
No alerts
Replay Analysis
N37555BOEING Boeing 737 MAX 9
→
06/27/2026
3h 19m
No alerts
Replay Analysis
N804UAAIRBUS Airbus A319
→
06/20/2026
1h 1m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window