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Flight Reliability

DL 2551 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 2551 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
3 min early
Average arrival delay
0.7%
Cancelled
15 min early
Median arrival delay

Based on 712 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(102 flights)
  • Tue86%(102 flights)
  • Wed93%(102 flights)
  • Thu86%(102 flights)
  • Fri94%(100 flights)
  • Sat87%(96 flights)
  • Sun83%(103 flights)
On-time by departure window
  • 9 AM–12 PM93%(15 flights)
  • 12–3 PM87%(347 flights)
  • 3–6 PM89%(345 flights)
On-time trend by month
94%
May

Jun 88% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%58
July 202590%62
August 202584%62
September 202595%60
October 202592%62
November 202585%58
December 202592%49
January 202686%56
February 202684%56
March 202681%62
April 202685%60
May 202694%62
Departures on time
86%
Diverted
0%
Flights flown
707
Months covered
12

Keep nerding

Based on 712 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.