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Flight Reliability

DL 511 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 511 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

83%
Arrive within 15 minutes
7 min
Average arrival delay
0.8%
Cancelled
6 min early
Median arrival delay

Based on 727 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(101 flights)
  • Tue82%(103 flights)
  • Wed87%(104 flights)
  • Thu88%(104 flights)
  • Fri75%(104 flights)
  • Sat86%(101 flights)
  • Sun79%(103 flights)
On-time by departure window
  • 6–9 AM86%(359 flights)
  • 9 AM–12 PM80%(358 flights)
  • 12–3 PM—(3 flights)
On-time trend by month
89%
May

Jun 78% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%60
July 202577%62
August 202576%62
September 202590%60
October 202590%62
November 202587%60
December 202577%60
January 202686%56
February 202686%56
March 202670%60
April 202690%60
May 202689%62
Departures on time
83%
Diverted
0.1%
Flights flown
720
Months covered
12

Keep nerding

Based on 727 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.