OnTimeStats

Historical on-time performance

Chicago to Springfield

174 miData through Dec 2025Source: US DOT · BTS

Flights on ORD–SPI arrive on time 79% of the time over the last 12 months.

On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled2.2%of scheduled flights

based on 405 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Envoy Airbest
    On-time82%
    Medianon time
    p9030 min
    Cancel1.9%
    Flights375
  • SkyWest Airlines
    On-time43%
    Median15 min
    p90235 min
    Cancel6.7%
    Flights30

Why flights run late

Delay causes

  • Airline28%
  • Weather6%
  • Air traffic (NAS)17%
  • Late aircraft48%
  • 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 → SPI

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

Best time of day

Mornings are the most reliable time of day to fly this route — 97% on time.

  • Mornings97% on time · p90 5 min · 63 flights · limited
  • Middays89% on time · p90 10 min · 173 flights · limited
  • Evenings74% on time · p90 35 min · 145 flights · limited
  • Overnights67% on time · p90 100 min · 75 flights · limited
  • Afternoons56% on time · p90 120 min · 160 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 68% to 81% on time.

  • Tuesdays81% on time · p90 35 min · 81 flights · limited
  • Wednesdays78% on time · p90 45 min · 83 flights · limited
  • Mondays78% on time · p90 50 min · 94 flights · limited
  • Sundays77% on time · p90 70 min · 93 flights · limited
  • Fridays72% on time · p90 50 min · 93 flights · limited
  • Saturdays70% on time · p90 45 min · 84 flights · limited
  • Thursdays68% on time · p90 90 min · 88 flights · limited
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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.