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Flight Reliability

DL 3986 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3986 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
15 min
Average arrival delay
2.0%
Cancelled
9 min early
Median arrival delay

Based on 687 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(98 flights)
  • Tue77%(95 flights)
  • Wed77%(96 flights)
  • Thu78%(96 flights)
  • Fri72%(98 flights)
  • Sat84%(89 flights)
  • Sun78%(100 flights)
On-time by departure window
  • 6–9 AM—(3 flights)
  • 9 AM–12 PM78%(442 flights)
  • 12–3 PM75%(197 flights)
  • 3–6 PM93%(30 flights)
On-time trend by month
81%
May

Jun 88% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%59
July 202584%62
August 202568%62
September 202585%60
October 202598%62
November 202588%48
December 202589%26
January 202647%58
February 202658%55
March 202670%60
April 202683%58
May 202681%62
Departures on time
76%
Diverted
0.1%
Flights flown
672
Months covered
12

Keep nerding

Based on 687 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.