Schedule: a typical Friday (the flights of Jul 31, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
DELTA · FLIGHT DL 2509
SCHEDULED · TYPICAL SCHEDULE
Tomorrow
DL 2509 · BNA → BOS
departs 7:30 AM CT · arrives 11:11 AM ET
Forecast issued Thu 9:00 PM ET · 12h before departure
Odds over time
Arrive at BOS more than 15 minutes late?
14%
chance · ±0 pts
+4 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
-
-
-
-
How late will it get to BOS?
-
On time or early
85%
-
15–30 min late
8%
-
30 min–1 hour late
<1%
-
1–2 hours late
4%
-
Over 2 hours late
2%
-
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.