UAL1660

UNITED AIRLINES INC · ORD → SEA

UAL1660 is operated by UNITED AIRLINES INC between Chicago O'Hare International Airport (KORD) and Seattle Tacoma International Airport (KSEA). The flight is most often flown by a BOEING Boeing 737 MAX 9. Typical block time is 3h 40m. SkyMeter has observed 47 legs of this flight number via ADS-B.

✈
FLIGHTS
47
last 90 days
⏱
AVG DURATION
3h 40m
tracked time
📅
SERVICE PERIOD
04/17/2026 → 06/03/2026
first → last seen
🗺
ROUTES / TYPES
8 / 5
city pairs · airframes
⚠
INCIDENT RATE
2.1%
1 flagged

Routes flown

By count · last 90 days

4
KORD → KSEA
24
avg 4h 6m · Chicago O'Hare → Seattle Tacoma
KSEA → KIAH
8
avg 4h 10m · Seattle Tacoma → George Bush Intercontinental Houston
KLAS → KIAH
8
avg 2h 49m · McCarran → George Bush Intercontinental Houston
WA85 → KSEA
1
avg 9m · Weyerhaeuser Heliport → Seattle Tacoma

Aircraft types

Equipment used on this number

5
B39M BOEING Boeing 737 MAX 9
26
B739 BOEING Boeing 737-900
12
A320 AIRBUS Airbus A320
8
A21N AIRBUS Airbus A321 Neo
4
A319 AIRBUS Airbus A319
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 UAL1660

30
N17425BOEING Boeing 737 MAX 9
→
06/03/2026
3h 52m
No alerts
Replay Analysis
N477UAAIRBUS Airbus A320
→
06/03/2026
4h 6m
No alerts
Replay Analysis
N37510BOEING Boeing 737 MAX 9
→
06/02/2026
3h 46m
No alerts
Replay Analysis
N490UAAIRBUS Airbus A320
→
06/02/2026
3h 56m
No alerts
Replay Analysis
N17414BOEING Boeing 737 MAX 9
→
06/01/2026
4h 14m
No alerts
Replay Analysis
N466UAAIRBUS Airbus A320
→
06/01/2026
4h 5m
No alerts
Replay Analysis
N17433BOEING Boeing 737 MAX 9
→
05/31/2026
3h 55m
No alerts
Replay Analysis
N14520AIRBUS Airbus A321 Neo
→
05/29/2026
3h 39m
No alerts
Replay Analysis
N481UAAIRBUS Airbus A320
→
05/29/2026
4h 7m
No alerts
Replay Analysis
N24510AIRBUS Airbus A321 Neo
→
05/28/2026
3h 55m
No alerts
Replay Analysis
N445UAAIRBUS Airbus A320
→
05/28/2026
4h 13m
No alerts
Replay Analysis
N68880BOEING Boeing 737-900
→
05/27/2026
4h 6m
No alerts
Replay Analysis
N430UAAIRBUS Airbus A320
→
05/27/2026
4h 39m
No alerts
Replay Analysis
N54552AIRBUS Airbus A321 Neo
→
05/26/2026
3h 51m
No alerts
Replay Analysis
N473UAAIRBUS Airbus A320
→
05/26/2026
4h 15m
No alerts
Replay Analysis
N69826BOEING Boeing 737-900
→
05/25/2026
3h 56m
No alerts
Replay Analysis
N34562AIRBUS Airbus A321 Neo
→
05/24/2026
4h 18m
No alerts
Replay Analysis
N878UAAIRBUS Airbus A319
→
05/23/2026
4h 4m
No alerts
Replay Analysis
N467UAAIRBUS Airbus A320
→
05/23/2026
3h 58m
No alerts
Replay Analysis
N77573BOEING Boeing 737 MAX 9
→
05/21/2026
3h 59m
No alerts
Replay Analysis
N39416BOEING Boeing 737-900
→
05/20/2026
4h 21m
No alerts
Replay Analysis
N37538BOEING Boeing 737 MAX 9
→
05/18/2026
4h 26m
No alerts
Replay Analysis
N17566BOEING Boeing 737 MAX 9
→
05/18/2026
44m
No alerts
Replay Analysis
N17566BOEING Boeing 737 MAX 9
→
05/17/2026
3h 20m
No alerts
Replay Analysis
N17566BOEING Boeing 737 MAX 9
→
05/17/2026
4h 4m
No alerts
Replay Analysis
N17405BOEING Boeing 737 MAX 9
→
05/16/2026
4h 19m
No alerts
Replay Analysis
N17438BOEING Boeing 737 MAX 9
→
05/15/2026
4h 17m
No alerts
Replay Analysis
N97424BOEING Boeing 737 MAX 9
→
05/14/2026
4h 13m
No alerts
Replay Analysis
N37554BOEING Boeing 737 MAX 9
→
05/13/2026
4h 7m
No alerts
Replay Analysis
N77558BOEING Boeing 737 MAX 9
→
05/11/2026
4h 17m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window