UAL3921

UNITED AIRLINES INC · SFO → ORD

UAL3921 is operated by UNITED AIRLINES INC between San Francisco International Airport (KSFO) and Chicago O'Hare International Airport (KORD). The flight is most often flown by a BOEING Boeing 767-300. Typical block time is 3h 26m. SkyMeter has observed 30 legs of this flight number via ADS-B.

✈
FLIGHTS
30
last 90 days
⏱
AVG DURATION
3h 26m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 9/2/2026
first → last seen
🗺
ROUTES / TYPES
29 / 10
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

10
KSFO → KORD
2
avg 4h 0m · San Francisco → Chicago O'Hare
KORD → KIAH
1
avg 2h 16m · Chicago O'Hare → George Bush Intercontinental Houston
EGLL → KEWR
1
avg 7h 42m · London Heathrow → Newark Liberty
KIAH → KSFO
1
avg 3h 27m · George Bush Intercontinental Houston → San Francisco
US-1410 → KSAN
1
avg 49m · Sheraton Gateway Los Angeles Hotel Helipad → San Diego
KEWR → KCLT
1
avg 1h 33m · Newark Liberty → Charlotte Douglas
KLAX → KONT
1
avg 41m · Los Angeles → Ontario
KEWR → KIAH
1
avg 3h 38m · Newark Liberty → George Bush Intercontinental Houston
KIAD → KSFO
1
avg 5h 17m · Washington Dulles → San Francisco
KCLE → KLGA
1
avg 2h 6m · Cleveland Hopkins → La Guardia

Aircraft types

Equipment used on this number

10
B763 BOEING Boeing 767-300
9
B764 BOEING Boeing 767-400
4
B772 BOEING Boeing 777-200
3
B739 BOEING Boeing 737-900
3
B738 BOEING Boeing 737-800
3
B753 BOEING Boeing 757-300
3
B752 BOEING Boeing 757-200
2
A320 AIRBUS Airbus A320
2
B38M BOEING Boeing 737 MAX 8
2
B788 BOEING Boeing 787-8 BBJ/Dreamliner
2

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 UAL3921

30
N453UAAIRBUS Airbus A320
→
9/2/2026
2h 1m
No alerts
Replay Analysis
N796UABOEING Boeing 777-200
→
9/1/2026
1h 35m
No alerts
Replay Analysis
N26902BOEING Boeing 787-8 BBJ/Dreamliner
→
8/26/2026
5h 17m
No alerts
Replay Analysis
N76062BOEING Boeing 767-400
→
8/25/2026
7h 41m
No alerts
Replay Analysis
N67815BOEING Boeing 737-900
→
8/23/2026
1h 21m
No alerts
Replay Analysis
N37474BOEING Boeing 737-900
→
8/21/2026
49m
No alerts
Replay Analysis
N29907BOEING Boeing 787-8 BBJ/Dreamliner
→
8/17/2026
3h 52m
No alerts
Replay Analysis
N39423BOEING Boeing 737-900
→
8/14/2026
40m
No alerts
Replay Analysis
N75858BOEING Boeing 757-300
→
8/14/2026
4h 48m
No alerts
Replay Analysis
N13138BOEING Boeing 757-200
→
8/10/2026
2h 16m
No alerts
Replay Analysis
N14250BOEING Boeing 737-800
→
8/10/2026
39m
No alerts
Replay Analysis
N57863BOEING Boeing 757-300
→
8/8/2026
2h 16m
No alerts
Replay Analysis
N57863BOEING Boeing 757-300
→
8/5/2026
4h 2m
No alerts
Replay Analysis
N14228BOEING Boeing 737-800
→
8/3/2026
2h 6m
No alerts
Replay Analysis
N662UABOEING Boeing 767-300
→
8/3/2026
2h 15m
No alerts
Replay Analysis
N662UABOEING Boeing 767-300
→
8/2/2026
9h 10m
No alerts
Replay Analysis
N662UABOEING Boeing 767-300
→
8/2/2026
3h 5m
No alerts
Replay Analysis
N19141BOEING Boeing 757-200
→
7/31/2026
7h 29m
No alerts
Replay Analysis
N875UAAIRBUS Airbus A319
→
7/29/2026
1h 55m
No alerts
Replay Analysis
N27366BOEING Boeing 737 MAX 8
→
7/27/2026
4h 43m
No alerts
Replay Analysis
N431UAAIRBUS Airbus A320
→
7/17/2026
1h 54m
No alerts
Replay Analysis
N684UABOEING Boeing 767-300
→
7/16/2026
31m
No alerts
Replay Analysis
N684UABOEING Boeing 767-300
→
7/15/2026
3h 37m
No alerts
Replay Analysis
N684UABOEING Boeing 767-300
→
7/15/2026
4h 9m
No alerts
Replay Analysis
N66051BOEING Boeing 767-400
→
7/8/2026
1h 30m
No alerts
Replay Analysis
N66051BOEING Boeing 767-400
→
7/8/2026
9h 9m
No alerts
Replay Analysis
N66051BOEING Boeing 767-400
→
7/8/2026
7h 37m
No alerts
Replay Analysis
N12238BOEING Boeing 737-800
→
7/4/2026
1h 14m
No alerts
Replay Analysis
N17311BOEING Boeing 737 MAX 8
→
7/1/2026
2h 7m
No alerts
Replay Analysis
N796UABOEING Boeing 777-200
→
6/28/2026
3h 32m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window