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Flight Reliability

DL 2520 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 2520 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

56%
Arrive within 15 minutes
27 min
Average arrival delay
5.3%
Cancelled
8 min
Median arrival delay

Based on 514 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon47%(72 flights)
  • Tue63%(71 flights)
  • Wed58%(72 flights)
  • Thu49%(69 flights)
  • Fri51%(71 flights)
  • Sat70%(60 flights)
  • Sun52%(69 flights)
On-time by departure window
  • 12–3 PM—(6 flights)
  • 3–6 PM57%(340 flights)
  • 6–9 PM51%(138 flights)
On-time trend by month
70%
May

Jun 24% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202524%54
July 202530%50
August 202561%59
September 202575%57
October 202554%56
November 202556%36
December 202550%28
January 202666%29
February 202662%26
March 202672%29
April 202670%30
May 202670%30
Departures on time
59%
Diverted
0.6%
Flights flown
484
Months covered
12

Keep nerding

Based on 514 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.