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Flight Reliability

DL 1559 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1559 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

74%
Arrive within 15 minutes
11 min
Average arrival delay
1.2%
Cancelled
5 min early
Median arrival delay

Based on 570 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon64%(77 flights)
  • Tue73%(82 flights)
  • Wed77%(82 flights)
  • Thu74%(82 flights)
  • Fri74%(80 flights)
  • Sat82%(79 flights)
  • Sun74%(81 flights)
On-time by departure window
  • 6–9 AM88%(16 flights)
  • 9 AM–12 PM69%(16 flights)
  • 3–6 PM73%(353 flights)
  • 6–9 PM76%(178 flights)
On-time trend by month
60%
May

Jun 79% → May 60% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%53
July 202585%59
August 202583%41
September 202583%30
October 202561%31
November 202573%30
December 202572%43
January 202694%48
February 202666%55
March 202690%60
April 202645%60
May 202660%53
Departures on time
76%
Diverted
0%
Flights flown
563
Months covered
12

Keep nerding

Based on 570 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.