Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
UNITED · FLIGHT UA 1639SCHEDULED · TYPICAL SCHEDULE
Today
UA 1639 · DEN → STL
departs 1:25 PM MT · arrives 4:33 PM CT
Forecast issued Fri 3:00 AM ET · 12h before departure
Odds over time
Arrive at STL more than 15 minutes late?
28%chance · ±0 pts+5 pts · 24h
HOW SURE WE AREGood. The odds now lean mostly on firmed-up weather forecasts.
How late will it get to STL?
On time or early
70%
15–30 min late
18%
30 min–1 hour late
2%
1–2 hours late
6%
Over 2 hours late
2%
Cancelled
3%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.