About 1 in 3 DL 1171 flights from Detroit arrived 15+ minutes late, diverted or cancelled over the past year (33%); 1.4% were cancelled. The typical flight landed 1 minutes late.
DL 1171: DTW → BOS
Scheduled to leave Detroit at 2:00 p.m. local time. Over the past year it arrived on time 67% of the time (360 flights), in line with other DL flights on the route at that hour (67%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 66% |
| Tuesday | 52 | 75% |
| Wednesday | 50 | 64% |
| Thursday | 49 | 63% |
| Friday | 52 | 73% |
| Saturday | 52 | 75% |
| Sunday | 52 | 54% |
Why it was late
All flights DTW → BOS · Connecting off DL 1171? Check the risk
Questions
How often is DL 1171 from DTW to BOS late?
Delta Air Lines 1171 from Detroit, MI to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 33% of 360 scheduled flights between September 2025 and August 2026. 1.4% 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.