Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
UNITED · FLIGHT UA 1660SCHEDULED · TYPICAL SCHEDULE
UA 1660 · SEA → IAH
departs 5:00 PM PT · arrives 11:26 PM CT
Forecast issued Fri 6:00 AM ET · 62h before departure
Odds over time
Arrive at IAH more than 15 minutes late?
18%chance · ±2 pts– · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to IAH?
On time or early
82%
15–30 min late
5%
30 min–1 hour late
7%
1–2 hours late
3%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.