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Flight Reliability

DL 5399 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 5399 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

73%
Arrive within 15 minutes
10 min
Average arrival delay
2.5%
Cancelled
8 min early
Median arrival delay

Based on 566 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon67%(78 flights)
  • Tue68%(80 flights)
  • Wed77%(83 flights)
  • Thu78%(78 flights)
  • Fri76%(75 flights)
  • Sat87%(77 flights)
  • Sun60%(80 flights)
On-time by departure window
  • 9 AM–12 PM76%(76 flights)
  • 12–3 PM73%(475 flights)
On-time trend by month
69%
Apr

Jun 60% → Apr 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%52
July 202563%57
August 202573%62
September 202586%59
October 202580%61
November 202571%55
December 202563%35
January 202674%54
February 202682%22
March 202680%46
April 202669%42
Departures on time
73%
Diverted
0.2%
Flights flown
551
Months covered
12

Keep nerding

Based on 566 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.