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Flight Reliability

DL 4901 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4901 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

83%
Arrive within 15 minutes
1 min
Average arrival delay
2.6%
Cancelled
12 min early
Median arrival delay

Based on 532 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(69 flights)
  • Tue88%(76 flights)
  • Wed86%(71 flights)
  • Thu86%(72 flights)
  • Fri82%(73 flights)
  • Sat73%(78 flights)
  • Sun78%(78 flights)
On-time by departure window
  • 6–9 AM90%(58 flights)
  • 9 AM–12 PM83%(185 flights)
  • 12–3 PM83%(179 flights)
  • 3–6 PM76%(95 flights)
On-time trend by month
48%
May

Jun 89% → May 48% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%52
July 202593%61
August 202584%62
September 202592%60
October 202586%44
December 202564%14
January 202689%53
February 202678%50
March 202675%60
April 202673%40
May 202648%21
Departures on time
82%
Diverted
0.2%
Flights flown
517
Months covered
11

Keep nerding

Based on 532 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.