Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 663SCHEDULED · TYPICAL SCHEDULE
DL 663 · ATL → SLC
departs 11:56 AM ET · arrives 1:50 PM MT
Forecast issued Fri 4:00 PM ET · 44h before departure
Odds over time
Arrive at SLC more than 15 minutes late?
16%chance · ±4 pts−6 pts · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to SLC?
On time or early
83%
15–30 min late
1%
30 min–1 hour late
10%
1–2 hours late
3%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.