OnTimeStats

Historical on-time performance

Chicago to Grand Rapids

137 miData through Dec 2025Source: US DOT · BTS

Flights on MDW–GRR arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights

based on 866 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time77%
    Medianon time
    p9045 min
    Cancel0.5%
    Flights866

Why flights run late

Delay causes

  • Airline28%
  • Weather2%
  • Air traffic (NAS)8%
  • Late aircraft60%
  • Security1%

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 MDW → GRR

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 63% to 87% on time.

  • Mornings87% on time · p90 15 min · 650 flights
  • Middays85% on time · p90 20 min · 606 flights
  • Afternoons76% on time · p90 35 min · 452 flights
  • Evenings70% on time · p90 40 min · 249 flights
  • Overnights63% on time · p90 70 min · 917 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 69% to 83% on time.

  • Saturdays83% on time · p90 30 min · 316 flights
  • Tuesdays80% on time · p90 35 min · 427 flights
  • Wednesdays79% on time · p90 25 min · 427 flights
  • Fridays75% on time · p90 50 min · 424 flights
  • Mondays73% on time · p90 50 min · 427 flights
  • Thursdays72% on time · p90 40 min · 425 flights
  • Sundays69% on time · p90 50 min · 428 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.