OnTimeStats

Historical on-time performance

Decatur to Chicago

156 miData through Dec 2025Source: US DOT · BTS

Flights on DEC–ORD arrive on time 70% of the time over the last 12 months.

On-time rate70%arrived within 15 min
Median delayon timetypical arrival
p90 delay80 min1 in 10 flights is worsetail risk
Cancelled2.7%of scheduled flights

based on 627 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlinesbest
    On-time70%
    Medianon time
    p9080 min
    Cancel2.7%
    Flights627

Why flights run late

Delay causes

  • Airline51%
  • Weather2%
  • Air traffic (NAS)15%
  • Late aircraft32%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

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Keep exploring

Related pages

Delay predictorfor this route→DEC airportDecatur→ORD airportChicago→SkyWest Airlines on this routecarrier detail→SkyWest Airlinesairline profile→

Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.