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Flight Reliability

DL 4089 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4089 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

88%
Arrive within 15 minutes
8 min
Average arrival delay
1.0%
Cancelled
10 min early
Median arrival delay

Based on 410 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(62 flights)
  • Tue93%(60 flights)
  • Wed83%(63 flights)
  • Thu94%(64 flights)
  • Fri81%(64 flights)
  • Sat90%(30 flights)
  • Sun89%(63 flights)
On-time by departure window
  • 6–9 AM83%(198 flights)
  • 9 AM–12 PM95%(42 flights)
  • 3–6 PM93%(147 flights)
  • 6–9 PM84%(19 flights)
On-time trend by month
87%
May

Jun 78% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%27
July 202589%27
August 202581%26
September 202593%29
October 202577%31
November 202590%29
December 202578%18
January 202682%11
February 202680%39
March 2026100%60
April 202696%56
May 202687%53
Departures on time
88%
Diverted
0%
Flights flown
406
Months covered
12

Keep nerding

Based on 410 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.