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Flight Reliability

DL 4059 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4059 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

80%
Arrive within 15 minutes
14 min
Average arrival delay
2.2%
Cancelled
8 min early
Median arrival delay

Based on 679 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(96 flights)
  • Tue78%(95 flights)
  • Wed74%(96 flights)
  • Thu87%(96 flights)
  • Fri77%(95 flights)
  • Sat80%(88 flights)
  • Sun82%(96 flights)
On-time by departure window
  • 6–9 AM86%(119 flights)
  • 9 AM–12 PM77%(496 flights)
  • 12–3 PM89%(47 flights)
On-time trend by month
85%
May

Jun 72% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%58
July 202592%62
August 202592%62
September 202590%60
October 202591%56
November 202588%48
December 202557%23
January 202660%60
February 202676%54
March 202664%58
April 202675%60
May 202685%61
Departures on time
81%
Diverted
0.3%
Flights flown
662
Months covered
12

Keep nerding

Based on 679 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.