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Flight Reliability

DL 5178 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 5178 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

65%
Arrive within 15 minutes
22 min
Average arrival delay
6.0%
Cancelled
3 min early
Median arrival delay

Based on 504 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon68%(69 flights)
  • Tue67%(75 flights)
  • Wed65%(72 flights)
  • Thu57%(70 flights)
  • Fri72%(75 flights)
  • Sat70%(40 flights)
  • Sun58%(71 flights)
On-time by departure window
  • 9 AM–12 PM55%(11 flights)
  • 12–3 PM76%(133 flights)
  • 3–6 PM64%(115 flights)
  • 6–9 PM59%(213 flights)
On-time trend by month
77%
May

Jun 37% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202537%38
July 202554%43
August 202554%39
September 202587%23
October 202572%29
November 202550%28
December 202550%36
January 202678%49
February 202675%48
March 202680%35
April 202664%44
May 202677%60
Departures on time
68%
Diverted
0.4%
Flights flown
472
Months covered
12

Keep nerding

Based on 504 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.