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Flight Reliability

DL 1109 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1109 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

87%
Arrive within 15 minutes
0 min
Average arrival delay
1.4%
Cancelled
11 min early
Median arrival delay

Based on 571 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(98 flights)
  • Tue90%(89 flights)
  • Wed96%(83 flights)
  • Thu90%(88 flights)
  • Fri78%(86 flights)
  • Sat87%(23 flights)
  • Sun86%(91 flights)
On-time by departure window
  • 9 AM–12 PM88%(33 flights)
  • 12–3 PM89%(265 flights)
  • 3–6 PM87%(237 flights)
  • 9 PM–12 AM61%(23 flights)
On-time trend by month
86%
May

Jun 84% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202584%50
July 202584%51
August 202592%49
September 202592%52
October 202592%60
November 202582%50
December 202585%54
January 202688%17
February 202673%26
March 202690%49
April 202688%50
May 202686%50
Departures on time
87%
Diverted
0.9%
Flights flown
558
Months covered
12

Keep nerding

Based on 571 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.