OnTimeStats

Historical on-time performance

Springfield to Chicago

174 miData through May 2026Source: US DOT · BTS

Flights on SPI–ORD arrive on time 80% of the time over the last 12 months.

On-time rate80%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled3.4%of scheduled flights

based on 582 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.

  • Envoy Air
    On-time81%
    Medianon time
    p9040 min
    Cancel3.1%
    Flights552
  • SkyWest Airlines
    On-time53%
    Median10 min
    p90220 min
    Cancel10.0%
    Flights30

Why flights run late

Delay causes

  • Airline33%
  • Weather6%
  • Air traffic (NAS)22%
  • Late aircraft38%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline0%
  • Weather55%
  • Air traffic (NAS)45%
  • Security0%

Most cancellations here are attributed to Weather. Shares are among 20 cancellations with a reported cause (BTS reports causes from June 2003).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly SPI → ORD

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 60% to 91% on time.

  • Middays91% on time · p90 10 min · 196 flights · limited
  • Mornings86% on time · p90 30 min · 238 flights
  • Afternoons75% on time · p90 55 min · 138 flights · limited
  • Evenings60% on time · p90 110 min · 215 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 74% to 86% on time.

  • Wednesdays86% on time · p90 40 min · 109 flights · limited
  • Thursdays79% on time · p90 70 min · 118 flights · limited
  • Sundays76% on time · p90 70 min · 121 flights · limited
  • Tuesdays76% on time · p90 85 min · 107 flights · limited
  • Mondays75% on time · p90 50 min · 119 flights · limited
  • Fridays74% on time · p90 55 min · 121 flights · limited

Keep exploring

Related pages

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.