UAL3940

UNITED AIRLINES INC · IAD → IAH

UAL3940 is operated by UNITED AIRLINES INC between Washington Dulles International Airport (KIAD) and George Bush Intercontinental Houston Airport (KIAH). The flight is most often flown by a BOEING Boeing 787-9 Dreamliner. Typical block time is 3h 22m. SkyMeter has observed 30 legs of this flight number via ADS-B.

✈
FLIGHTS
30
last 90 days
⏱
AVG DURATION
3h 22m
tracked time
📅
SERVICE PERIOD
12/02/2025 → 08/18/2026
first → last seen
🗺
ROUTES / TYPES
27 / 10
city pairs · airframes
⚠
INCIDENT RATE
3.3%
1 flagged

Routes flown

By count · last 90 days

10
KEWR → KORD
2
avg 2h 25m · Newark Liberty → Chicago O'Hare
KIAD → KIAH
2
avg 3h 15m · Washington Dulles → George Bush Intercontinental Houston
EGLL → KEWR
1
avg 7h 37m · London Heathrow → Newark Liberty
SBGR → KEWR
1
avg 9h 40m · Guarulhos - Governador André Franco Montoro → Newark Liberty
KORD → KSFO
1
avg 4h 9m · Chicago O'Hare → San Francisco
KIAD → KATL
1
avg 1h 22m · Washington Dulles → Hartsfield Jackson Atlanta
KBNA → KSFO
1
avg 4h 10m · Nashville → San Francisco
KORD → KIAD
1
avg 1h 40m · Chicago O'Hare → Washington Dulles
KDEN → KSFO
1
avg 2h 21m · Denver → San Francisco
KIAH → KDEN
1
avg 3h 0m · George Bush Intercontinental Houston → Denver

Aircraft types

Equipment used on this number

10
B789 BOEING Boeing 787-9 Dreamliner
7
A319 AIRBUS Airbus A319
6
B763 BOEING Boeing 767-300
4
B738 BOEING Boeing 737-800
3
A21N AIRBUS Airbus A321 Neo
3
B772 BOEING Boeing 777-200
2
B752 BOEING Boeing 757-200
2
B38M BOEING Boeing 737 MAX 8
2
B737 BOEING Boeing 737-700
2
B39M BOEING Boeing 737 MAX 9
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 30 operations of UAL3940

30
N17753BOEING Boeing 737-700
→
08/18/2026
2h 22m
No alerts
Replay Analysis
N29977BOEING Boeing 787-9 Dreamliner
→
08/17/2026
12h 25m
No alerts
Replay Analysis
N38473BOEING Boeing 737-900
→
08/09/2026
1h 49m
△ Low approach-stability score
Replay Analysis
N851UAAIRBUS Airbus A319
→
08/07/2026
52m
No alerts
Replay Analysis
N17133BOEING Boeing 757-200
→
08/06/2026
3h 5m
No alerts
Replay Analysis
N33103BOEING Boeing 757-200
→
07/31/2026
1h 39m
No alerts
Replay Analysis
N47291BOEING Boeing 737 MAX 8
→
07/30/2026
1h 7m
No alerts
Replay Analysis
N27205BOEING Boeing 737-800
→
07/29/2026
4h 8m
No alerts
Replay Analysis
N77261BOEING Boeing 737-800
→
07/27/2026
2h 9m
No alerts
Replay Analysis
N14560AIRBUS Airbus A321 Neo
→
07/21/2026
2h 13m
No alerts
Replay Analysis
N77012BOEING Boeing 777-200
→
07/18/2026
3h 24m
No alerts
Replay Analysis
N882UAAIRBUS Airbus A319
→
07/15/2026
4h 10m
No alerts
Replay Analysis
N4888UAIRBUS Airbus A319
→
07/11/2026
1h 21m
No alerts
Replay Analysis
N675UABOEING Boeing 767-300
→
07/08/2026
57m
No alerts
Replay Analysis
N675UABOEING Boeing 767-300
→
07/07/2026
6h 39m
No alerts
Replay Analysis
N675UABOEING Boeing 767-300
→
07/07/2026
7h 37m
No alerts
Replay Analysis
N61101BOEING Boeing 787-9 Dreamliner
→
07/05/2026
3h 20m
No alerts
Replay Analysis
N61101BOEING Boeing 787-9 Dreamliner
→
07/04/2026
4h 27m
No alerts
Replay Analysis
N61101BOEING Boeing 787-9 Dreamliner
→
07/04/2026
11h 1m
No alerts
Replay Analysis
N29989BOEING Boeing 787-9 Dreamliner
→
07/03/2026
9h 36m
No alerts
Replay Analysis
N29989BOEING Boeing 787-9 Dreamliner
→
07/01/2026
2h 33m
No alerts
Replay Analysis
N843UAAIRBUS Airbus A319
→
06/27/2026
2h 1m
No alerts
Replay Analysis
N76021BOEING Boeing 777-200
→
06/25/2026
9h 40m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/21/2026
44m
No alerts
Replay Analysis
N54543AIRBUS Airbus A321 Neo
→
06/21/2026
3h 0m
No alerts
Replay Analysis
N873UAAIRBUS Airbus A319
→
06/19/2026
47m
No alerts
Replay Analysis
N76254BOEING Boeing 737-800
→
06/16/2026
35m
No alerts
Replay Analysis
N17316BOEING Boeing 737 MAX 8
→
06/15/2026
43m
No alerts
Replay Analysis
N847UAAIRBUS Airbus A319
→
06/12/2026
2h 0m
No alerts
Replay Analysis
N483UAAIRBUS Airbus A320
→
06/10/2026
2h 17m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window