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Flight Reliability

DL 856 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 856 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

65%
Arrive within 15 minutes
18 min
Average arrival delay
4.3%
Cancelled
2 min early
Median arrival delay

Based on 397 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(59 flights)
  • Tue70%(60 flights)
  • Wed63%(60 flights)
  • Thu64%(63 flights)
  • Fri63%(65 flights)
  • Sat—(7 flights)
  • Sun56%(63 flights)
On-time by departure window
  • 6–9 AM75%(16 flights)
  • 9 AM–12 PM69%(26 flights)
  • 12–3 PM78%(121 flights)
  • 3–6 PM61%(51 flights)
  • 6–9 PM55%(163 flights)
On-time trend by month
67%
May

Jun 36% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202536%31
July 202544%23
August 202568%25
September 202573%26
October 202552%25
November 202560%25
December 202555%29
January 202681%26
February 202682%34
March 202672%50
April 202674%38
May 202667%45
Departures on time
65%
Diverted
0.8%
Flights flown
377
Months covered
12

Keep nerding

Based on 397 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.