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Flight Reliability

DL 3971 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3971 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

79%
Arrive within 15 minutes
8 min
Average arrival delay
2.4%
Cancelled
8 min early
Median arrival delay

Based on 296 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(44 flights)
  • Tue91%(42 flights)
  • Wed75%(44 flights)
  • Thu75%(44 flights)
  • Fri71%(42 flights)
  • Sat75%(32 flights)
  • Sun88%(41 flights)
On-time by departure window
  • 9 AM–12 PM85%(158 flights)
  • 3–6 PM—(2 flights)
  • 6–9 PM78%(64 flights)
  • 9 PM–12 AM65%(65 flights)
On-time trend by month
86%
May

Sep 95% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 202595%21
November 202576%21
December 202553%17
January 202664%25
February 202659%27
March 202685%47
April 202684%56
May 202686%62
Departures on time
79%
Diverted
0%
Flights flown
289
Months covered
11

Keep nerding

Based on 296 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.