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Flight Reliability

DL 4127 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4127 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

88%
Arrive within 15 minutes
0 min
Average arrival delay
0.4%
Cancelled
8 min early
Median arrival delay

Based on 704 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon89%(101 flights)
  • Tue94%(101 flights)
  • Wed83%(101 flights)
  • Thu88%(99 flights)
  • Fri83%(99 flights)
  • Sat95%(98 flights)
  • Sun82%(102 flights)
On-time by departure window
  • 9 AM–12 PM89%(344 flights)
  • 12–3 PM87%(341 flights)
  • 3–6 PM94%(16 flights)
On-time trend by month
92%
May

Jun 85% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%60
July 202582%62
August 202582%62
September 202587%60
October 202590%62
November 202588%57
December 202594%62
January 202686%62
February 202689%56
March 202682%61
April 202698%60
May 202692%37
Departures on time
90%
Diverted
0%
Flights flown
701
Months covered
12

Keep nerding

Based on 704 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.