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Flight Reliability

DL 4178 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4178 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

81%
Arrive within 15 minutes
6 min
Average arrival delay
2.0%
Cancelled
6 min early
Median arrival delay

Based on 199 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(31 flights)
  • Tue83%(29 flights)
  • Wed81%(31 flights)
  • Thu77%(30 flights)
  • Fri73%(30 flights)
  • Sat94%(16 flights)
  • Sun86%(28 flights)
On-time by departure window
  • 6–9 AM88%(41 flights)
  • 9 AM–12 PM83%(23 flights)
  • 3–6 PM78%(131 flights)
On-time trend by month
82%
Apr

Jun 93% → Apr 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%14
November 202596%22
December 202579%19
January 202696%27
February 202676%25
March 202661%44
April 202682%38
Departures on time
81%
Diverted
0%
Flights flown
195
Months covered
9

Keep nerding

Based on 199 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.