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Flight Reliability

DL 5599 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 5599 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

76%
Arrive within 15 minutes
9 min
Average arrival delay
4.5%
Cancelled
10 min early
Median arrival delay

Based on 334 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(43 flights)
  • Tue67%(46 flights)
  • Wed85%(47 flights)
  • Thu73%(48 flights)
  • Fri64%(45 flights)
  • Sat77%(48 flights)
  • Sun86%(42 flights)
On-time by departure window
  • 12–3 PM88%(96 flights)
  • 3–6 PM76%(29 flights)
  • 6–9 PM69%(193 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
73%
May

Jun 61% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202561%28
July 202541%29
September 202581%21
October 202580%30
November 202592%24
December 202585%33
January 202690%30
February 202680%25
March 202677%30
April 202670%30
May 202673%30
Departures on time
75%
Diverted
0%
Flights flown
319
Months covered
12

Keep nerding

Based on 334 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.