OnTimeStats

Historical on-time performance

Chicago to Champaign

135 miData through Dec 2025Source: US DOT · BTS

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

On-time rate70%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled3.0%of scheduled flights

based on 924 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Envoy Air
    On-time70%
    Medianon time
    p9065 min
    Cancel3.0%
    Flights924

Why flights run late

Delay causes

  • Airline14%
  • Weather16%
  • Air traffic (NAS)17%
  • Late aircraft53%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly ORD → CMI

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 67% to 82% on time.

  • Afternoons82% on time · p90 25 min · 293 flights
  • Mornings80% on time · p90 25 min · 338 flights
  • Middays77% on time · p90 55 min · 505 flights
  • Overnights67% on time · p90 55 min · 746 flights
  • Evenings67% on time · p90 65 min · 384 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 68% to 79% on time.

  • Saturdays79% on time · p90 30 min · 315 flights
  • Tuesdays79% on time · p90 40 min · 263 flights
  • Mondays75% on time · p90 40 min · 338 flights
  • Wednesdays72% on time · p90 55 min · 321 flights
  • Fridays71% on time · p90 55 min · 339 flights
  • Sundays71% on time · p90 50 min · 348 flights
  • Thursdays68% on time · p90 65 min · 342 flights
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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.