Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 1187
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Tomorrow
DL 1187 · DTW → BOS
departs 9:59 PM ET · arrives 11:59 PM ET
Forecast issued Fri 7:00 AM ET · 39h before departure
Watch this flight
Other days
Today 28%
Sat 10/3
Sun 10/4 25%
Mon 10/5 28%
Tue 10/6 18%
Wed 10/7 24%
Odds over time
Arrive at BOS more than 15 minutes late?
10%
chance · ±0 pts
+1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
13%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
5.0d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at BOS more than 15 minutes late?
Calm-weather odds: 10% · changed +1 pt in 24h
+1 pt
10%
Yes 10%
No 90%
Leave DTW more than 15 minutes late?
Calm-weather odds: 13% · changed +1 pt in 24h
+1 pt
13%
Yes 13%
No 87%
Arrive at BOS more than an hour late?
Calm-weather odds: 3% · changed +1 pt in 24h
+1 pt
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 BOS?
On time or early
89%
15–30 min late
<1%
30 min–1 hour late
6%
1–2 hours late
2%
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
↑
Arrivals into BOS at that hour are often late
↑
This flight has been late 28% of the time recently
↑
9pm 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 9 mi Precip none
BOS (destination)
Gusts 11 kt Ceiling 6,000 ft Visibility 10+ mi Precip 0.02 in
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.