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Flight Reliability

DL 1503 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1503 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

81%
Arrive within 15 minutes
1 min
Average arrival delay
1.9%
Cancelled
7 min early
Median arrival delay

Based on 531 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(72 flights)
  • Tue78%(72 flights)
  • Wed82%(76 flights)
  • Thu76%(75 flights)
  • Fri82%(74 flights)
  • Sat83%(76 flights)
  • Sun84%(76 flights)
On-time by departure window
  • 9 AM–12 PM68%(50 flights)
  • 12–3 PM84%(43 flights)
  • 3–6 PM82%(385 flights)
  • 6–9 PM81%(43 flights)
On-time trend by month
83%
May

Jun 80% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%60
July 202578%60
August 202587%45
September 202585%41
October 202591%56
November 202573%41
December 202575%60
January 202682%34
February 202683%36
March 202680%30
April 202668%28
May 202683%30
Departures on time
82%
Diverted
0%
Flights flown
521
Months covered
12

Keep nerding

Based on 531 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.