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Flight Reliability

DL 1623 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1623 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
5 min
Average arrival delay
1.0%
Cancelled
8 min early
Median arrival delay

Based on 627 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(90 flights)
  • Tue81%(89 flights)
  • Wed81%(90 flights)
  • Thu84%(89 flights)
  • Fri82%(87 flights)
  • Sat82%(79 flights)
  • Sun84%(93 flights)
On-time by departure window
  • 12–3 PM82%(353 flights)
  • 3–6 PM81%(264 flights)
On-time trend by month
100%
May

Jun 60% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%53
July 202563%57
August 202573%60
September 202591%57
October 202586%56
November 202587%53
December 202588%50
January 202693%29
February 202686%43
March 202684%62
April 202679%42
May 2026100%55
Departures on time
85%
Diverted
0.6%
Flights flown
617
Months covered
12

Keep nerding

Based on 627 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.