Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
DELTA · FLIGHT DL 859SCHEDULED · TYPICAL SCHEDULE
Tomorrow
DL 859 · BOS → SLC
departs 6:05 AM ET · arrives 9:17 AM MT
Forecast issued Wed 12:00 AM ET · 30h before departure
Odds over time
Arrive at SLC more than 15 minutes late?
6%chance · ±1 pts−1 pt · 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
93%
15–30 min late
3%
30 min–1 hour late
1%
1–2 hours late
<1%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.