Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
DELTA · FLIGHT DL 2331
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
DL 2331 · DTW → PHL
departs 10:05 AM ET · arrives 11:41 AM ET
Forecast issued Wed 10:00 PM ET · 60h before departure
Watch this flight
Other days
Today 18%
Fri 10/2 12%
Sat 10/3
Sun 10/4 9%
Mon 10/5 11%
Tue 10/6 7%
Odds over time
Arrive at PHL more than 15 minutes late?
8%
chance · ±0 pts
−2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
8%
Leave 15+ late
10%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
4.5d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at PHL more than 15 minutes late?
Calm-weather odds: 7% · changed −2 pts in 24h
−2 pts
8%
Yes 8%
No 92%
Leave DTW more than 15 minutes late?
Calm-weather odds: 8% · changed −1 pt in 24h
−1 pt
10%
Yes 10%
No 90%
Arrive at PHL more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to PHL?
On time or early
92%
15–30 min late
2%
30 min–1 hour late
3%
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%.
What’s moving the odds
↑
Other factors
↑
10am departures from DTW are often late
↓
Mostly benign weather forecast at DTW
↓
DL's recent on-time record
Weather at each end
DTW (origin)
Gusts 9 kt Ceiling none (clear) Visibility 10+ mi Precip none
PHL (destination)
Gusts 14 kt Ceiling 2,467 ft Visibility 8.66667 mi Precip none
How this resolves
Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.
Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.