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 2647SCHEDULED · TYPICAL SCHEDULE
UA 2647 · SFO → BOS
departs 8:10 AM PT · arrives 5:04 PM ET
Forecast issued Fri 3:00 AM ET · 56h before departure
Odds over time
Arrive at BOS more than 15 minutes late?
13%chance · ±1 pts– · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to BOS?
On time or early
86%
15–30 min late
4%
30 min–1 hour late
6%
1–2 hours late
2%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.