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Flight Reliability

DL 1540 · Delta Air Lines

Philadelphia → Detroit (PHL–DTW)

89
Pretty Reliable
WanderNerd Reliability Score
92%
Arrive within 15 minutes
1 min early
Average arrival delay
2.6%
Cancelled
16 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

Skip Tuesday if you can.

DL 1540 arrived on time 100% of the time on Wednesdays. On Tuesdays: 87%.

Better than the PHL–DTW route average.

DL 1540 arrived on time 92% of the time, versus 80% across the PHL–DTW route.

Better than the Delta Air Lines network average.

DL 1540 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.

Trending in the right direction.

DL 1540 arrived on time 94% of the time over the last three months in the data, compared with 84% in the three months before that.

The breakdown

On-time by weekday
  • Mon94%(48 flights)
  • Tue87%(47 flights)
  • Wed100%(49 flights)
  • Thu90%(48 flights)
  • Fri92%(49 flights)
  • Sat90%(48 flights)
  • Sun90%(48 flights)
On-time trend by month
90%
May

Jun 97% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%29
July 202591%11
August 202587%31
September 2025100%30
October 2025100%31
November 202590%30
December 202583%30
January 202679%28
February 202689%27
March 202693%30
April 2026100%30
May 202690%30
Departures on time
91%
Diverted
0%
Flights flown
337
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.