Historical on-time performance
Houston to Chicago
917 miData through May 2026Source: US DOT · BTS
No flights recorded for last 12 months on this route.
By airline
How each carrier compares
No airline figures for this window yet.
Why flights run late
Delay causes
Delay-cause data appears once delayed flights are recorded for this window.
When flights don't go
Why flights were cancelled
- Airline27%
- Weather73%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 44 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 IAH → MDW
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 52% to 83% on time.
- Mornings83% on time · p90 25 min · 230 flights
- Middays82% on time · p90 40 min · 488 flights
- Afternoons77% on time · p90 40 min · 338 flights
- Evenings52% on time · p90 105 min · 119 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 84% on time.
- Tuesdays84% on time · p90 25 min · 160 flights · limited
- Sundays79% on time · p90 40 min · 181 flights · limited
- Fridays78% on time · p90 45 min · 225 flights
- Wednesdays77% on time · p90 45 min · 164 flights · limited
- Thursdays77% on time · p90 55 min · 198 flights · limited
- Saturdays76% on time · p90 50 min · 104 flights · limited
- Mondays69% on time · p90 80 min · 222 flights
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