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Flight Reliability

DL 1579 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1579 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

68%
Arrive within 15 minutes
17 min
Average arrival delay
0.7%
Cancelled
1 min
Median arrival delay

Based on 686 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(96 flights)
  • Tue73%(95 flights)
  • Wed73%(95 flights)
  • Thu74%(98 flights)
  • Fri70%(96 flights)
  • Sat57%(97 flights)
  • Sun61%(100 flights)
On-time by departure window
  • 12–3 PM72%(355 flights)
  • 3–6 PM63%(322 flights)
On-time trend by month
79%
May

Jun 61% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202561%59
July 202553%61
August 202562%61
September 202576%59
October 202570%60
November 202570%60
December 202560%60
January 202669%54
February 202670%56
March 202660%37
April 202690%48
May 202679%62
Departures on time
70%
Diverted
0.6%
Flights flown
677
Months covered
12

Keep nerding

Based on 686 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.