OnTimeStats

Historical on-time performance

Wilmington to Chicago

761 miData through May 2026Source: US DOT · BTS

Flights on ILM–ORD arrive on time 76% of the time over the last 12 months.

On-time rate76%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled2.4%of scheduled flights

based on 336 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-time83%
    Medianon time
    p9020 min
    Cancel2.1%
    Flights241
  • American Airlines
    On-time63%
    Medianon time
    p9095 min
    Cancel3.1%
    Flights64
  • SkyWest Airlines
    On-time48%
    Median10 min
    p9080 min
    Cancel3.2%
    Flights31

Why flights run late

Delay causes

  • Airline18%
  • Weather13%
  • Air traffic (NAS)19%
  • Late aircraft50%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline25%
  • Weather50%
  • Air traffic (NAS)25%
  • Security0%

Most cancellations here are attributed to Weather. Shares are among 8 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 ILM → 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 47% to 86% on time.

  • Mornings86% on time · p90 20 min · 118 flights · limited
  • Middays82% on time · p90 35 min · 389 flights
  • Afternoons68% on time · p90 55 min · 183 flights · limited
  • Evenings47% on time · p90 80 min · 146 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 65% to 80% on time.

  • Mondays80% on time · p90 40 min · 110 flights · limited
  • Saturdays74% on time · p90 65 min · 155 flights · limited
  • Wednesdays73% on time · p90 55 min · 101 flights · limited
  • Fridays73% on time · p90 65 min · 121 flights · limited
  • Sundays72% on time · p90 75 min · 131 flights · limited
  • Thursdays65% on time · p90 35 min · 122 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.