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Flight Reliability

DL 1665 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1665 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

70%
Arrive within 15 minutes
21 min
Average arrival delay
2.6%
Cancelled
1 min early
Median arrival delay

Based on 418 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon68%(59 flights)
  • Tue73%(59 flights)
  • Wed72%(60 flights)
  • Thu72%(58 flights)
  • Fri68%(59 flights)
  • Sat65%(54 flights)
  • Sun72%(58 flights)
On-time by departure window
  • 12–3 PM76%(45 flights)
  • 3–6 PM79%(97 flights)
  • 6–9 PM66%(261 flights)
  • 9 PM–12 AM—(4 flights)
On-time trend by month
66%
May

Jun 63% → May 66% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%30
July 202540%30
August 202571%31
September 202567%30
October 202574%57
November 202583%54
December 202581%36
January 202672%25
February 202686%28
March 202655%29
April 202668%28
May 202666%29
Departures on time
73%
Diverted
0%
Flights flown
407
Months covered
12

Keep nerding

Based on 418 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.