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Flight Reliability

DL 2821 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 2821 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

78%
Arrive within 15 minutes
15 min
Average arrival delay
1.4%
Cancelled
8 min early
Median arrival delay

Based on 213 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(34 flights)
  • Tue84%(32 flights)
  • Wed79%(33 flights)
  • Thu79%(33 flights)
  • Fri71%(31 flights)
  • Sat91%(11 flights)
  • Sun79%(33 flights)
On-time by departure window
  • 12–3 PM72%(18 flights)
  • 3–6 PM82%(150 flights)
  • 6–9 PM64%(39 flights)
On-time trend by month
79%
May

Jun 77% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%26
July 202567%27
August 202580%20
September 202594%17
October 202583%23
November 202568%22
December 202567%27
April 2026100%18
May 202679%24
Departures on time
76%
Diverted
1.4%
Flights flown
207
Months covered
10

Keep nerding

Based on 213 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.