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Flight Reliability

DL 1640 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1640 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

89%
Arrive within 15 minutes
2 min early
Average arrival delay
0.7%
Cancelled
10 min early
Median arrival delay

Based on 698 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(102 flights)
  • Tue82%(102 flights)
  • Wed96%(100 flights)
  • Thu92%(99 flights)
  • Fri87%(100 flights)
  • Sat88%(91 flights)
  • Sun92%(98 flights)
On-time by departure window
  • 9 AM–12 PM87%(60 flights)
  • 12–3 PM90%(601 flights)
  • 3–6 PM84%(19 flights)
  • 9 PM–12 AM58%(12 flights)
On-time trend by month
89%
May

Jun 93% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%58
July 202590%62
August 202594%62
September 202593%60
October 202592%60
November 202598%60
December 202577%44
January 202682%56
February 202681%48
March 202685%60
April 202688%60
May 202689%62
Departures on time
89%
Diverted
0.1%
Flights flown
692
Months covered
12

Keep nerding

Based on 698 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.