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 1171
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
DL 1171 · DTW → BOS
departs 2:19 PM ET · arrives 4:26 PM ET
Forecast issued Thu 12:00 PM ET · 50h before departure
Watch this flight
Other days
Today 54%
Fri 10/2 19%
Sat 10/3
Sun 10/4 26%
Mon 10/5 28%
Tue 10/6 16%
Wed 10/7 29%
Odds over time
Arrive at BOS more than 15 minutes late?
10%
chance · ±1 pts
−2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
14%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.7d
Now
1d
12h
6h
Departs
Lands
Arrive at BOS more than 15 minutes late?
Calm-weather odds: 9% · changed −2 pts in 24h
−2 pts
10%
Yes 10%
No 90%
Leave DTW more than 15 minutes late?
Calm-weather odds: 11% · changed −2 pts in 24h
−2 pts
14%
Yes 14%
No 86%
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
90%
15–30 min late
0%
30 min–1 hour late
7%
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
↑
2pm departures from DTW are often late
↑
This flight has been late 29% of the time recently
↓
Mostly benign weather forecast at BOS
↓
DL's recent on-time record
Weather at each end
DTW (origin)
Gusts 9 kt Ceiling none (clear) Visibility 10+ mi Precip none
BOS (destination)
Gusts 12 kt Ceiling 9,333 ft Visibility 10+ 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.