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Flight Reliability

DL 1511 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1511 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

78%
Arrive within 15 minutes
8 min
Average arrival delay
3.5%
Cancelled
6 min early
Median arrival delay

Based on 401 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(53 flights)
  • Tue82%(55 flights)
  • Wed87%(53 flights)
  • Thu77%(56 flights)
  • Fri78%(55 flights)
  • Sat73%(55 flights)
  • Sun76%(58 flights)
On-time by departure window
  • 6–9 AM86%(49 flights)
  • 9 AM–12 PM78%(59 flights)
  • 12–3 PM74%(80 flights)
  • 3–6 PM80%(10 flights)
  • 6–9 PM84%(50 flights)
  • 9 PM–12 AM77%(137 flights)
On-time trend by month
77%
May

Jun 50% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%28
July 202587%30
August 202577%30
September 202593%30
October 202587%31
November 202577%30
December 202574%31
January 202677%30
February 202681%26
March 202675%47
April 202686%42
May 202677%30
Departures on time
78%
Diverted
0.5%
Flights flown
385
Months covered
12

Keep nerding

Based on 401 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.