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Flight Reliability

DL 1230 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1230 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

84%
Arrive within 15 minutes
3 min
Average arrival delay
2.9%
Cancelled
12 min early
Median arrival delay

Based on 453 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(66 flights)
  • Tue88%(67 flights)
  • Wed88%(66 flights)
  • Thu83%(66 flights)
  • Fri81%(63 flights)
  • Sat81%(63 flights)
  • Sun76%(46 flights)
On-time by departure window
  • 6–9 AM92%(117 flights)
  • 9 AM–12 PM82%(181 flights)
  • 6–9 PM78%(139 flights)
On-time trend by month
79%
May

Jun 80% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%44
July 202591%54
August 202586%58
September 202596%52
October 202577%30
November 202587%30
December 202585%26
January 202664%28
February 202679%28
March 202676%29
April 202690%29
May 202679%29
Departures on time
85%
Diverted
0.7%
Flights flown
437
Months covered
12

Keep nerding

Based on 453 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.