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 2356SCHEDULED · TYPICAL SCHEDULE
UA 2356 · SFO → BOS
departs 10:05 AM PT · arrives 6:59 PM ET
Forecast issued Fri 1:00 AM ET · 60h before departure
Odds over time
Arrive at BOS more than 15 minutes late?
26%chance · ±2 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
74%
15–30 min late
8%
30 min–1 hour late
8%
1–2 hours late
8%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.