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Flight Reliability

DL 1243 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1243 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

75%
Arrive within 15 minutes
12 min
Average arrival delay
2.4%
Cancelled
2 min early
Median arrival delay

Based on 493 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(67 flights)
  • Tue84%(64 flights)
  • Wed74%(65 flights)
  • Thu74%(74 flights)
  • Fri75%(73 flights)
  • Sat73%(64 flights)
  • Sun73%(73 flights)
On-time by departure window
  • 6–9 AM93%(15 flights)
  • 12–3 PM80%(226 flights)
  • 3–6 PM72%(166 flights)
  • 6–9 PM66%(73 flights)
On-time trend by month
73%
May

Jun 53% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%53
July 202571%58
August 202574%50
September 202595%20
October 202583%18
November 202586%22
December 202580%30
January 202681%31
February 202676%45
March 202677%56
April 202688%41
May 202673%56
Departures on time
78%
Diverted
0.2%
Flights flown
480
Months covered
12

Keep nerding

Based on 493 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.