Historical on-time performance
Salt Lake City to Chicago
1,258 miData through May 2026Source: US DOT · BTS
Flights on SLC–MDW arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 617 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time83%Medianon timep9020 minCancel0.8%Flights617
Why flights run late
Delay causes
- Airline27%
- Weather8%
- Air traffic (NAS)22%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline20%
- Weather80%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 5 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 94% on time.
- Mornings94% on time · p90 5 min · 1,023 flights
- Middays78% on time · p90 25 min · 429 flights
- Afternoons73% on time · p90 35 min · 500 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 87% on time.
- Wednesdays87% on time · p90 15 min · 287 flights
- Fridays87% on time · p90 15 min · 301 flights
- Mondays86% on time · p90 15 min · 298 flights
- Saturdays84% on time · p90 20 min · 215 flights
- Sundays84% on time · p90 20 min · 273 flights
- Thursdays84% on time · p90 20 min · 296 flights
- Tuesdays82% on time · p90 30 min · 290 flights
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