ON TIMEBOARD
Delta Air Lines / DTW → PHL

DL 2331 on time

Delta Air Lines 2331: Detroit to Philadelphia at 10:15 a.m.; Philadelphia to Detroit at 12:36 p.m. (past 12 months). Figures below the title are for DTW → PHL, its busiest leg

On time
87%
156 flights · likely 80–91%
Cancelled
1.9%
of scheduled flights
Typical arrival
−13 min
median vs schedule
When late
+45 min
average delay
Similar flights
83%
DL, same route & hour

About 1 in 7 DL 2331 flights from Detroit arrived 15+ minutes late, diverted or cancelled over the past year (13%); 1.9% were cancelled. The typical flight landed 13 minutes early.

DL 2331: DTW → PHL

Scheduled to leave Detroit at 10:15 a.m. local time. Over the past year it arrived on time 87% of the time (156 flights), better than other DL flights on the route at that hour (83%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Mar 2026: 88% on time (24 flights)88MarApr 2026: too few flights (14 flights)AprMay 2026: 85% on time (26 flights)85MayJun 2026: 90% on time (30 flights)90JunJul 2026: 81% on time (31 flights)81JulAug 2026: 90% on time (31 flights)90Aug

By day of week

DayFlightsOn time
Monday2268%
Tuesday2186%
Wednesday2195%
Thursday2286%
Friday2286%
Saturday2592%
Sunday2391%

Why it was late

Airline (crew, maintenance, ops) 63%Air traffic & airport (NAS) 30%Late inbound plane 6%

All flights DTW → PHL · Connecting off DL 2331? Check the risk

DL 2331: PHL → DTW

Scheduled to leave Philadelphia at 12:36 p.m. local time. Over the past year it arrived on time 85% of the time (156 flights), in line with other DL flights on the route at that hour (83%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Mar 2026: 88% on time (24 flights)88MarApr 2026: too few flights (14 flights)AprMay 2026: 88% on time (26 flights)88MayJun 2026: 87% on time (30 flights)87JunJul 2026: 84% on time (31 flights)84JulAug 2026: 77% on time (31 flights)77Aug

By day of week

DayFlightsOn time
Monday2268%
Tuesday2190%
Wednesday21100%
Thursday2286%
Friday2277%
Saturday2588%
Sunday2387%

Why it was late

Late inbound plane 52%Airline (crew, maintenance, ops) 18%Severe weather 17%Air traffic & airport (NAS) 13%

All flights PHL → DTW · Connecting off DL 2331? Check the risk

Questions

How often is DL 2331 from DTW to PHL late?

Delta Air Lines 2331 from Detroit, MI to Philadelphia, PA arrived 15 or more minutes late, was diverted or was cancelled on 13% of 156 scheduled flights between September 2025 and August 2026. 1.9% were cancelled.

How often is DL 2331 from PHL to DTW late?

Delta Air Lines 2331 from Philadelphia, PA to Detroit, MI arrived 15 or more minutes late, was diverted or was cancelled on 15% of 156 scheduled flights between September 2025 and August 2026. 3.2% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.