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Flight Reliability

DL 2539 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 2539 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

82%
Arrive within 15 minutes
3 min
Average arrival delay
2.2%
Cancelled
10 min early
Median arrival delay

Based on 631 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(92 flights)
  • Tue84%(92 flights)
  • Wed87%(91 flights)
  • Thu85%(87 flights)
  • Fri83%(89 flights)
  • Sat86%(79 flights)
  • Sun81%(82 flights)
On-time by departure window
  • 6–9 AM86%(35 flights)
  • 12–3 PM80%(241 flights)
  • 3–6 PM84%(336 flights)
On-time trend by month
90%
May

Jun 53% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%55
July 202568%59
August 202587%60
September 202595%60
October 202587%62
November 202587%60
December 202573%33
January 202688%49
February 202690%39
March 202687%30
April 202685%48
May 202690%57
Departures on time
79%
Diverted
0.8%
Flights flown
612
Months covered
12

Keep nerding

Based on 631 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.