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Flight Reliability

DL 4166 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4166 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

71%
Arrive within 15 minutes
17 min
Average arrival delay
0.4%
Cancelled
7 min early
Median arrival delay

Based on 527 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(77 flights)
  • Tue69%(77 flights)
  • Wed66%(73 flights)
  • Thu62%(71 flights)
  • Fri70%(77 flights)
  • Sat88%(74 flights)
  • Sun79%(76 flights)
On-time by departure window
  • 3–6 PM70%(279 flights)
  • 6–9 PM73%(246 flights)
On-time trend by month
76%
May

Jun 64% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%58
July 202545%56
August 202597%60
September 202597%60
October 2025100%12
November 202577%22
December 202565%37
January 202653%32
February 202620%20
March 202652%46
April 202687%60
May 202676%62
Departures on time
69%
Diverted
0%
Flights flown
525
Months covered
12

Keep nerding

Based on 527 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.