OnTimeStats

Historical on-time performance

Philadelphia to Chicago

668 miData through Dec 2025Source: US DOT · BTS

Flights on PHL–MDW arrive on time 72% of the time over the last 12 months.

On-time rate72%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights

based on 1,444 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time72%
    Medianon time
    p9055 min
    Cancel1.0%
    Flights1,444

Why flights run late

Delay causes

  • Airline24%
  • Weather3%
  • Air traffic (NAS)25%
  • 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 PHL → MDW

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 — 87% on time.

  • Mornings87% on time · p90 15 min · 1,370 flights
  • Middays81% on time · p90 30 min · 1,384 flights
  • Afternoons76% on time · p90 50 min · 779 flights
  • Overnights59% on time · p90 95 min · 562 flights
  • Evenings57% on time · p90 80 min · 1,000 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 72% to 79% on time.

  • Tuesdays79% on time · p90 30 min · 698 flights
  • Wednesdays77% on time · p90 35 min · 715 flights
  • Saturdays76% on time · p90 40 min · 544 flights
  • Mondays75% on time · p90 55 min · 809 flights
  • Thursdays74% on time · p90 50 min · 769 flights
  • Fridays72% on time · p90 60 min · 795 flights
  • Sundays72% on time · p90 60 min · 765 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.