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Flight Reliability

DL 1321 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1321 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

69%
Arrive within 15 minutes
17 min
Average arrival delay
2.2%
Cancelled
2 min early
Median arrival delay

Based on 276 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon67%(39 flights)
  • Tue65%(40 flights)
  • Wed81%(37 flights)
  • Thu63%(40 flights)
  • Fri67%(39 flights)
  • Sat77%(34 flights)
  • Sun68%(41 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM42%(72 flights)
  • 6–9 PM79%(196 flights)
On-time trend by month
86%
May

Jul 90% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202590%20
August 202592%12
October 202541%27
November 202542%26
December 202552%31
January 202673%30
February 202682%27
March 202671%31
April 202680%30
May 202686%29
Departures on time
73%
Diverted
0%
Flights flown
270
Months covered
11

Keep nerding

Based on 276 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.