IAH (Houston) to SAT (San Antonio) flights arrive on time 81% of the time. The most reliable airline on this route is United Airlines at 81%. The average delay is 63 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated August 2026.IAH → SAT
IAH (Houston) to SAT (San Antonio)
IAH → SAT on-time performance by month
24
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26
JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 81% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
United Airlines edges out SkyWest Airlines on this route — 81% vs 75% on time.
Airline Comparison
United Airlines leads at 81% on time; SkyWest Airlines trails at 75%.
Accurate?
Good to know
Departing from IAH
79% on timeExpect ~20 min sitting on the taxiway after your gate pushes back. IAH has long runway queues.
TSA is currently ~23 min. Best time: 4 AM (about 5 min).
Arriving at SAT
81% on timeWhen flights into SAT are late, the average delay is 70 minutes. Build buffer if you have ground plans.
If connecting at SAT: TSA is ~26 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
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Flying out of IAH? We'll brief you.
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Data last updated August 2026. Source: Bureau of Transportation Statistics.