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Flight Reliability

DL 651 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 651 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
6 min
Average arrival delay
1.3%
Cancelled
7 min early
Median arrival delay

Based on 301 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(47 flights)
  • Tue84%(44 flights)
  • Wed89%(44 flights)
  • Thu81%(48 flights)
  • Fri81%(48 flights)
  • Sat86%(22 flights)
  • Sun80%(44 flights)
On-time by departure window
  • 6–9 AM94%(175 flights)
  • 3–6 PM—(4 flights)
  • 6–9 PM65%(82 flights)
  • 9 PM–12 AM69%(36 flights)
On-time trend by month
65%
May

Jun 100% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%24
July 202596%23
August 202589%28
September 202595%19
October 202596%22
November 202595%21
December 202580%30
January 202662%21
February 202652%23
March 202667%30
April 202697%30
May 202665%26
Departures on time
80%
Diverted
0%
Flights flown
297
Months covered
12

Keep nerding

Based on 301 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.