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Flight Reliability

DL 4078 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4078 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

87%
Arrive within 15 minutes
2 min
Average arrival delay
0%
Cancelled
9 min early
Median arrival delay

Based on 714 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(102 flights)
  • Tue84%(102 flights)
  • Wed92%(102 flights)
  • Thu96%(102 flights)
  • Fri82%(101 flights)
  • Sat82%(101 flights)
  • Sun87%(103 flights)
On-time by departure window
  • 6–9 AM87%(271 flights)
  • 9 AM–12 PM86%(421 flights)
  • 12–3 PM95%(21 flights)
On-time trend by month
94%
May

Jun 82% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%60
July 202597%62
August 202589%62
September 202582%60
October 202586%62
November 202588%60
December 202576%49
January 202691%58
February 202673%56
March 202689%62
April 202693%60
May 202694%62
Departures on time
89%
Diverted
0.1%
Flights flown
713
Months covered
12

Keep nerding

Based on 714 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.