Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
UNITED · FLIGHT UA 1678SCHEDULED · TYPICAL SCHEDULE
UA 1678 · SFO → DCA
departs 8:20 AM PT · arrives 4:47 PM ET
Forecast issued Thu 10:00 PM ET · 37h before departure
Odds over time
Arrive at DCA more than 15 minutes late?
15%chance · ±0 pts+4 pts · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to DCA?
On time or early
85%
15–30 min late
6%
30 min–1 hour late
4%
1–2 hours late
3%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.