Historical on-time performance
Salt Lake City to Chicago
1,258 miData through Dec 2025Source: US DOT · BTS
Flights on SLC–MDW arrive on time 86% of the time over the last 12 months.
On-time rate86%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 637 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time86%Medianon timep9020 minCancel0.3%Flights637
Why flights run late
Delay causes
- Airline29%
- Weather7%
- Air traffic (NAS)22%
- Late aircraft41%
- 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 SLC → 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 — 93% on time.
- Mornings93% on time · p90 5 min · 1,027 flights
- Middays79% on time · p90 30 min · 479 flights
- Afternoons73% on time · p90 35 min · 494 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 87% on time.
- Mondays87% on time · p90 15 min · 309 flights
- Fridays87% on time · p90 15 min · 306 flights
- Saturdays86% on time · p90 20 min · 219 flights
- Wednesdays84% on time · p90 20 min · 303 flights
- Tuesdays84% on time · p90 25 min · 305 flights
- Sundays84% on time · p90 20 min · 264 flights
- Thursdays82% on time · p90 25 min · 302 flights
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