IAH (Houston) to GSP (Greenville) flights arrive on time 69% of the time. The most reliable airline on this route is SkyWest Airlines at 81%. The average delay is 77 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated March 2026.IAH → GSP
IAH (Houston) to GSP (Greenville)
IAH → GSP on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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This route is delayed fairly often. About 69% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
SkyWest Airlines edges out United Airlines on this route — 81% vs 68% on time.
Airline Comparison
SkyWest Airlines leads at 81% on time; United Airlines trails at 68%.
Accurate?
Good to know
Departing from IAH
80% on timeExpect ~18 min sitting on the taxiway after your gate pushes back. IAH has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at GSP
83% on timeWhen flights into GSP are late, the average delay is 71 minutes. Build buffer if you have ground plans.
If connecting at GSP: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.