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Flight Reliability

DL 4012 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4012 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
6 min early
Average arrival delay
0.2%
Cancelled
11 min early
Median arrival delay

Based on 520 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon95%(77 flights)
  • Tue96%(78 flights)
  • Wed92%(76 flights)
  • Thu96%(76 flights)
  • Fri84%(77 flights)
  • Sat94%(62 flights)
  • Sun95%(73 flights)
On-time by departure window
  • 12–3 PM97%(64 flights)
  • 3–6 PM93%(424 flights)
  • 6–9 PM90%(31 flights)
On-time trend by month
85%
May

Jun 98% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202598%59
July 202595%61
August 202591%58
September 202597%60
October 202597%60
November 202592%36
December 202589%28
January 2026100%24
February 202691%22
March 202694%33
April 202681%32
May 202685%46
Departures on time
93%
Diverted
0%
Flights flown
519
Months covered
12

Keep nerding

Based on 520 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.