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
Yesterday
UA 1639 · STL → ORD
departs 5:59 PM CT · arrives 7:30 PM CT
Forecast issued Fri 10:00 PM ET · 3h after departure
Odds over time
Arrive at ORD more than 15 minutes late?
38%chance · ±0 pts+14 pts · 24h
HOW SURE WE AREVery high. The odds now come almost entirely from live conditions.
How late will it get to ORD?
On time or early
61%
15–30 min late
17%
30 min–1 hour late
12%
1–2 hours late
5%
Over 2 hours late
4%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.