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Flight Reliability

DL 1187 · Delta Air Lines

Detroit → Boston (DTW–BOS)

65
Usually Fine
WanderNerd Reliability Score
70%
Arrive within 15 minutes
13 min
Average arrival delay
2.9%
Cancelled
5 min early
Median arrival delay

Based on 350 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 1187 departing between 6–9 PM arrived on time 80% of the time, versus 70% between 9 PM–12 AM.

Sunday scaries are real for this one.

DL 1187 arrived on time 80% of the time on Thursdays and just 55% on Sundays. That gap is worth planning around.

A bit behind the DTW–BOS route.

DL 1187 arrived on time 70% of the time, versus 75% across the DTW–BOS route.

Lagging the Delta Air Lines network.

DL 1187 arrived on time 70% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon62%(50 flights)
  • Tue71%(52 flights)
  • Wed77%(52 flights)
  • Thu80%(50 flights)
  • Fri69%(49 flights)
  • Sat76%(38 flights)
  • Sun55%(49 flights)
On-time by departure window
  • 6–9 PM80%(15 flights)
  • 9 PM–12 AM70%(325 flights)
On-time trend by month
77%
May

Jun 40% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202540%25
July 202558%26
August 202554%24
September 202576%29
October 202587%30
November 202572%29
December 202558%31
January 202669%29
February 202685%26
March 202674%31
April 202683%29
May 202677%31
Departures on time
67%
Diverted
0%
Flights flown
340
Months covered
12

Same route, other flights

Keep nerding

Based on 350 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.