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 1339SCHEDULED · TYPICAL SCHEDULE
Yesterday
UA 1339 · DEN → SJU
departs 9:43 AM MT · arrives 5:38 PM AT
Forecast issued Fri 10:00 PM ET · 10h after departure
Odds over time
Arrive at SJU more than 15 minutes late?
18%chance · ±0 pts+1 pt · 24h
HOW SURE WE AREVery high. The odds now come almost entirely from live conditions.
How late will it get to SJU?
On time or early
82%
15–30 min late
8%
30 min–1 hour late
5%
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%.