Schedule: a typical Friday (the flights of Jul 31, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
UNITED · FLIGHT UA 512
SCHEDULED · TYPICAL SCHEDULE
Tomorrow
UA 512 · BOS → SFO
departs 4:15 PM ET · arrives 7:49 PM PT
Forecast issued Wed 11:00 PM ET · 41h before departure
Odds over time
Arrive at SFO more than 15 minutes late?
37%
chance · ±5 pts
+15 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
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How late will it get to SFO?
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On time or early
62%
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15–30 min late
8%
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30 min–1 hour late
13%
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1–2 hours late
8%
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Over 2 hours late
8%
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Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.