IAH (Houston) to GSP (Greenville) flights arrive on time 67% of the time. The most reliable airline on this route is SkyWest Airlines at 73%. The average delay is 71 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated August 2026.IAH → GSP
IAH (Houston) to GSP (Greenville)
IAH → GSP on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 67% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
SkyWest Airlines edges out United Airlines on this route — 73% vs 67% on time.
Airline Comparison
SkyWest Airlines leads at 73% on time; United Airlines trails at 67%.
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 ~12 min. Best time: 4 AM (about 5 min).
Arriving at GSP
80% on timeWhen flights into GSP are late, the average delay is 74 minutes. Build buffer if you have ground plans.
If connecting at GSP: TSA is ~26 min right now. Allow at least 60 minutes for a domestic connection.
GSP has a 2.3% cancellation rate — keep the airline app handy for rebooking.
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 August 2026. Source: Bureau of Transportation Statistics.