MDW (Chicago) to IAH (Houston) flights arrive on time 70% of the time. The most reliable airline on this route is Southwest Airlines at 70%. The average delay is 61 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated March 2026.MDW → IAH
MDW (Chicago) to IAH (Houston)
MDW → IAH on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 70% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Airlines are roughly equal on this route — Southwest Airlines leads slightly at 70% vs Frontier Airlines at 69%.
Airline Comparison
Southwest Airlines leads at 70% on time; Frontier Airlines trails at 69%.
Accurate?
Good to know
Departing from MDW
78% on timeTSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at IAH
80% on timeWhen flights into IAH are late, the average delay is 75 minutes. Build buffer if you have ground plans.
If connecting at IAH: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
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Data last updated March 2026. Source: Bureau of Transportation Statistics.