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 688SCHEDULED · TYPICAL SCHEDULE
UA 688 · MCI → IAD
departs 12:30 PM CT · arrives 4:03 PM ET
Forecast issued Sat 2:00 PM ET · 48h before departure
Odds over time
Arrive at IAD more than 15 minutes late?
8%chance · ±1 pts+0 pts · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to IAD?
On time or early
91%
15–30 min late
3%
30 min–1 hour late
1%
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%.