OnTimeStats

Historical on-time performance

Chicago to Pittsburgh

402 miData through Dec 2025Source: US DOT · BTS

Flights on MDW–PIT arrive on time 80% of the time over the last 12 months.

On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights

based on 1,130 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time80%
    Medianon time
    p9035 min
    Cancel1.0%
    Flights1,130

Why flights run late

Delay causes

  • Airline33%
  • Weather4%
  • Air traffic (NAS)11%
  • Late aircraft52%
  • 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 MDW → PIT

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 — 89% on time.

  • Mornings89% on time · p90 10 min · 970 flights
  • Middays84% on time · p90 20 min · 1,042 flights
  • Afternoons78% on time · p90 30 min · 441 flights
  • Evenings71% on time · p90 45 min · 721 flights
  • Overnights59% on time · p90 65 min · 606 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 74% to 82% on time.

  • Wednesdays82% on time · p90 30 min · 568 flights
  • Tuesdays81% on time · p90 25 min · 567 flights
  • Saturdays80% on time · p90 30 min · 341 flights
  • Mondays78% on time · p90 30 min · 599 flights
  • Thursdays76% on time · p90 35 min · 597 flights
  • Fridays75% on time · p90 35 min · 600 flights
  • Sundays74% on time · p90 35 min · 508 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.