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Flight Reliability

DL 3964 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3964 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

73%
Arrive within 15 minutes
18 min
Average arrival delay
1.1%
Cancelled
6 min early
Median arrival delay

Based on 549 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon70%(80 flights)
  • Tue67%(78 flights)
  • Wed71%(80 flights)
  • Thu71%(80 flights)
  • Fri83%(75 flights)
  • Sat73%(67 flights)
  • Sun77%(83 flights)
On-time by departure window
  • 12–3 PM78%(60 flights)
  • 3–6 PM71%(275 flights)
  • 6–9 PM71%(183 flights)
  • 9 PM–12 AM96%(25 flights)
On-time trend by month
97%
May

Jun 72% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%53
July 202572%60
August 202571%62
September 202585%60
October 202578%54
November 202560%47
January 202648%27
February 202667%43
March 202666%62
April 202688%42
May 202697%31
Departures on time
74%
Diverted
0%
Flights flown
543
Months covered
12

Keep nerding

Based on 549 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.