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Flight Reliability

DL 3815 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3815 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

80%
Arrive within 15 minutes
8 min
Average arrival delay
1.1%
Cancelled
11 min early
Median arrival delay

Based on 372 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(50 flights)
  • Tue73%(52 flights)
  • Wed85%(52 flights)
  • Thu83%(53 flights)
  • Fri87%(53 flights)
  • Sat72%(57 flights)
  • Sun86%(50 flights)
On-time by departure window
  • 3–6 AM85%(59 flights)
  • 6–9 AM83%(225 flights)
  • 9 AM–12 PM75%(28 flights)
  • 12–3 PM68%(25 flights)
  • 3–6 PM—(3 flights)
  • 6–9 PM67%(27 flights)
On-time trend by month
68%
May

Jun 82% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%22
July 202577%31
August 202594%31
September 202590%30
October 202587%31
November 202583%30
December 202555%22
January 202678%27
February 202689%28
March 202676%29
April 202683%30
May 202668%56
Departures on time
82%
Diverted
0.3%
Flights flown
367
Months covered
12

Keep nerding

Based on 372 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.