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Flight Reliability

DL 1591 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1591 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

64%
Arrive within 15 minutes
20 min
Average arrival delay
0.6%
Cancelled
3 min
Median arrival delay

Based on 317 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon59%(49 flights)
  • Tue58%(40 flights)
  • Wed74%(39 flights)
  • Thu71%(49 flights)
  • Fri69%(49 flights)
  • Sat62%(37 flights)
  • Sun57%(51 flights)
On-time by departure window
  • 12–3 PM82%(60 flights)
  • 3–6 PM88%(24 flights)
  • 6–9 PM52%(159 flights)
  • 9 PM–12 AM69%(71 flights)
On-time trend by month
48%
May

Jun 32% → May 48% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202532%28
July 202540%30
August 202558%31
September 202572%18
October 202575%16
November 202564%11
December 202552%23
January 202680%15
February 202684%43
March 202684%38
April 202680%30
May 202648%31
Departures on time
64%
Diverted
0.3%
Flights flown
314
Months covered
12

Keep nerding

Based on 317 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.