IAH (Houston) to GSP (Greenville) flights arrive on time 70% of the time. The most reliable airline on this route is SkyWest Airlines at 73%. The average delay is 73 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.IAH → GSP
IAH (Houston) to GSP (Greenville)
IAH → GSP on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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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 — SkyWest Airlines leads slightly at 73% vs United Airlines at 70%.
Airline Comparison
SkyWest Airlines leads at 73% on time; United Airlines trails at 70%.
Accurate?
Good to know
Departing from IAH
79% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. IAH has long runway queues.
TSA is currently ~24 min. Best time: 4 AM (about 5 min).
Arriving at GSP
81% on timeWhen flights into GSP are late, the average delay is 73 minutes. Build buffer if you have ground plans.
If connecting at GSP: TSA is ~29 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what SkyWest Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of IAH? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated October 2026. Source: Bureau of Transportation Statistics.