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Flight Reliability

DL 4135 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4135 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

93%
Arrive within 15 minutes
3 min early
Average arrival delay
0%
Cancelled
7 min early
Median arrival delay

Based on 705 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon94%(101 flights)
  • Tue97%(101 flights)
  • Wed90%(101 flights)
  • Thu91%(100 flights)
  • Fri94%(100 flights)
  • Sat93%(100 flights)
  • Sun93%(102 flights)
On-time by departure window
  • 9 AM–12 PM93%(365 flights)
  • 12–3 PM93%(340 flights)
On-time trend by month
87%
May

Jun 90% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%60
July 202595%62
August 202595%62
September 2025100%60
October 202592%62
November 2025100%60
December 202592%62
January 202689%62
February 202688%56
March 202694%62
April 202695%60
May 202687%37
Departures on time
93%
Diverted
0%
Flights flown
705
Months covered
12

Keep nerding

Based on 705 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.