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Flight Reliability

DL 1178 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1178 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
3 min early
Average arrival delay
2.3%
Cancelled
8 min early
Median arrival delay

Based on 682 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(99 flights)
  • Tue80%(101 flights)
  • Wed88%(103 flights)
  • Thu94%(101 flights)
  • Fri86%(95 flights)
  • Sat89%(74 flights)
  • Sun86%(93 flights)
On-time by departure window
  • 6–9 AM88%(328 flights)
  • 9 AM–12 PM87%(338 flights)
On-time trend by month
86%
May

Jun 91% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202591%55
July 202593%56
August 202594%62
September 202593%60
October 202592%60
November 202587%53
December 202568%60
January 202685%48
February 202689%44
March 202691%54
April 202679%58
May 202686%56
Departures on time
90%
Diverted
0%
Flights flown
666
Months covered
12

Keep nerding

Based on 682 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.