UAL3921

UNITED AIRLINES INC · BCN → IAD

UAL3921 is operated by UNITED AIRLINES INC between Barcelona International Airport (LEBL) and Washington Dulles International Airport (KIAD). The flight is most often flown by a BOEING Boeing 737-900. Typical block time is 2h 51m. SkyMeter has observed 13 legs of this flight number via ADS-B.

✈
FLIGHTS
13
last 90 days
⏱
AVG DURATION
2h 51m
tracked time
📅
SERVICE PERIOD
04/06/2026 → 05/29/2026
first → last seen
🗺
ROUTES / TYPES
13 / 8
city pairs · airframes
⚠
INCIDENT RATE
7.7%
1 flagged

Routes flown

By count · last 90 days

8
LEBL → KIAD
1
avg 9h 5m · Barcelona → Washington Dulles
KIAH → KEWR
1
avg 3h 2m · George Bush Intercontinental Houston → Newark Liberty
EGPH → KIAD
1
avg 7h 42m · Edinburgh → Washington Dulles
KIAH → KIAD
1
avg 2h 33m · George Bush Intercontinental Houston → Washington Dulles
KDEN → KPHX
1
avg 1h 53m · Denver → Phoenix Sky Harbor
CYYZ → KORD
1
avg 2h 21m · Lester B. Pearson → Chicago O'Hare
KORD → KDEN
1
avg 2h 40m · Chicago O'Hare → Denver
KEWR → KIAH
1
avg 3h 13m · Newark Liberty → George Bush Intercontinental Houston

Aircraft types

Equipment used on this number

8
B739 BOEING Boeing 737-900
4
B763 BOEING Boeing 767-300
3
A21N AIRBUS Airbus A321 Neo
2
B77W BOEING Boeing 777-300ER
2
A320 AIRBUS Airbus A320
1
B752 BOEING Boeing 757-200
1
B38M BOEING Boeing 737 MAX 8
1
B772 BOEING Boeing 777-200
1

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
1
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 15 operations of UAL3921

15
N14509AIRBUS Airbus A321 Neo
→
05/29/2026
44m
No alerts
Replay Analysis
N19136BOEING Boeing 757-200
→
05/26/2026
7h 41m
No alerts
Replay Analysis
N445UAAIRBUS Airbus A320
→
05/18/2026
2h 20m
No alerts
Replay Analysis
N788UABOEING Boeing 777-200
→
05/16/2026
3h 13m
△ Unstable
Replay Analysis
N47288BOEING Boeing 737 MAX 8
→
05/13/2026
3h 1m
No alerts
Replay Analysis
N648UABOEING Boeing 767-300
→
05/03/2026
1h 22m
No alerts
Replay Analysis
N648UABOEING Boeing 767-300
→
05/02/2026
7h 41m
No alerts
Replay Analysis
N648UABOEING Boeing 767-300
→
05/02/2026
9h 4m
No alerts
Replay Analysis
N14563AIRBUS Airbus A321 Neo
→
04/27/2026
2h 39m
No alerts
Replay Analysis
N2140UBOEING Boeing 777-300ER
→
04/19/2026
20m
No alerts
Replay Analysis
N2140UBOEING Boeing 777-300ER
→
04/19/2026
42m
No alerts
Replay Analysis
N61881BOEING Boeing 737-900
→
04/13/2026
2h 28m
No alerts
Replay Analysis
N38451BOEING Boeing 737-900
→
04/09/2026
2h 32m
No alerts
Replay Analysis
N31412BOEING Boeing 737-900
→
04/06/2026
21m
No alerts
Replay Analysis
N31412BOEING Boeing 737-900
→
04/06/2026
1h 52m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window