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Flight Reliability

DL 4001 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4001 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

82%
Arrive within 15 minutes
6 min
Average arrival delay
0.4%
Cancelled
3 min early
Median arrival delay

Based on 459 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(73 flights)
  • Tue88%(73 flights)
  • Wed81%(73 flights)
  • Thu92%(72 flights)
  • Fri73%(70 flights)
  • Sat79%(24 flights)
  • Sun86%(72 flights)
On-time by departure window
  • 9 AM–12 PM83%(23 flights)
  • 12–3 PM84%(279 flights)
  • 3–6 PM79%(155 flights)
On-time trend by month
93%
Apr

Jun 91% → Apr 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202591%43
July 202587%46
August 202588%40
September 202568%34
October 202571%52
November 202580%46
December 202578%58
January 202684%43
February 202686%28
March 202684%31
April 202693%30
Departures on time
86%
Diverted
0%
Flights flown
457
Months covered
12

Keep nerding

Based on 459 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.