Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
UNITED · FLIGHT UA 1721SCHEDULED · TYPICAL SCHEDULE
UA 1721 · SFO → KOA
departs 8:10 AM PT · arrives 10:40 AM HT
Forecast issued Sat 10:00 PM ET · 37h before departure
Odds over time
Arrive at KOA more than 15 minutes late?
10%chance · ±0 pts−1 pt · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to KOA?
On time or early
89%
15–30 min late
4%
30 min–1 hour late
3%
1–2 hours late
1%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.