OnTimeStats

Historical on-time performance

Chicago to Salt Lake City

1,258 miData through Dec 2025Source: US DOT · BTS

Flights on MDW–SLC 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)
Cancelled0.8%of scheduled flights

based on 638 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time76%
    Medianon time
    p9040 min
    Cancel0.8%
    Flights638

Why flights run late

Delay causes

  • Airline33%
  • Weather0%
  • Air traffic (NAS)13%
  • Late aircraft53%
  • 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 → SLC

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 65% to 84% on time.

  • Mornings84% on time · p90 20 min · 710 flights
  • Middays83% on time · p90 25 min · 333 flights
  • Afternoons75% on time · p90 45 min · 118 flights · limited
  • Evenings72% on time · p90 40 min · 126 flights · limited
  • Overnights65% on time · p90 65 min · 722 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 73% to 78% on time.

  • Tuesdays78% on time · p90 35 min · 305 flights
  • Saturdays78% on time · p90 35 min · 219 flights
  • Mondays77% on time · p90 40 min · 309 flights
  • Wednesdays75% on time · p90 40 min · 303 flights
  • Thursdays75% on time · p90 50 min · 303 flights
  • Sundays73% on time · p90 50 min · 264 flights
  • Fridays73% on time · p90 35 min · 306 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.