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Airport Reliability

DEC · Decatur

Decatur, IL (DEC)

80%
Departures within 15 minutes
22 min
Average departure delay
71%
Arrivals within 15 minutes
4.8%
Departures cancelled

Based on 627 departures and 627 arrivals. Data through May 2026.

What the data says

Morning flights do better here.

Departures from DEC departing between 9 AM–12 PM arrived on time 83% of the time, versus 57% between 6–9 PM.

Saturday is the weak spot.

Departures from DEC arrived on time 78% of the time on Mondays. On Saturdays: 65%.

When DEC gets messy

On-time by departure window
  • 9 AM–12 PM83%(293 flights)
  • 6–9 PM57%(303 flights)
On-time by weekday
  • Mon78%(99 flights)
  • Tue70%(53 flights)
  • Wed72%(100 flights)
  • Thu70%(96 flights)
  • Fri65%(100 flights)
  • Sat65%(51 flights)
  • Sun65%(97 flights)
On-time trend by month
65%
May

Jun 69% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%52
July 202574%49
August 202573%51
September 202577%51
October 202563%54
November 202564%47
December 202566%50
January 202662%50
February 202679%48
March 202669%45
April 202675%47
May 202665%52

Airlines departing DEC

Busiest routes from DEC

Based on 627 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.