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Flight Reliability

DL 3856 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3856 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

89%
Arrive within 15 minutes
1 min early
Average arrival delay
0.7%
Cancelled
11 min early
Median arrival delay

Based on 304 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon89%(44 flights)
  • Tue91%(42 flights)
  • Wed91%(44 flights)
  • Thu84%(44 flights)
  • Fri91%(45 flights)
  • Sat92%(39 flights)
  • Sun84%(44 flights)
On-time by departure window
  • 6–9 AM97%(71 flights)
  • 9 AM–12 PM87%(60 flights)
  • 12–3 PM94%(138 flights)
  • 3–6 PM44%(16 flights)
  • 6–9 PM65%(17 flights)
On-time trend by month
61%
May

Jun 97% → May 61% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202597%31
August 2025100%10
December 2025100%12
January 202694%31
February 202696%45
March 202692%62
April 202681%42
May 202661%38
Departures on time
89%
Diverted
0%
Flights flown
302
Months covered
10

Keep nerding

Based on 304 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.