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Flight Reliability

DL 1171 · Delta Air Lines

Detroit → Boston (DTW–BOS)

69
Usually Fine
WanderNerd Reliability Score
68%
Arrive within 15 minutes
19 min
Average arrival delay
0.8%
Cancelled
1 min
Median arrival delay

Based on 360 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 71% of the time, against 68% between 12–3 PM.

Sunday scaries are real for this one.

DL 1171 arrived on time 75% of the time on Saturdays and just 58% on Sundays. That gap is worth planning around.

A bit behind the DTW–BOS route.

DL 1171 arrived on time 68% of the time, versus 75% across the DTW–BOS route.

Lagging the Delta Air Lines network.

DL 1171 arrived on time 68% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon67%(51 flights)
  • Tue71%(52 flights)
  • Wed64%(50 flights)
  • Thu71%(49 flights)
  • Fri71%(51 flights)
  • Sat75%(52 flights)
  • Sun58%(52 flights)
On-time by departure window
  • 12–3 PM68%(343 flights)
  • 3–6 PM71%(14 flights)
On-time trend by month
84%
May

Jun 57% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%30
July 202558%31
August 202577%31
September 202547%30
October 202552%31
November 202579%29
December 202574%27
January 202669%29
February 202678%27
March 202687%31
April 202657%30
May 202684%31
Departures on time
69%
Diverted
0%
Flights flown
357
Months covered
12

Same route, other flights

Keep nerding

Based on 360 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.