Which airline is most reliable for GSP (Greenville) to IAH (Houston)?

The most reliable airline on the GSP to IAH route is SkyWest Airlines, with an on-time arrival rate of 87%.

How often are flights delayed from GSP to IAH?

About 16% of flights from GSP to IAH experience delays. 84% arrive on time.

What's the average delay on GSP to IAH flights?

When flights from GSP to IAH are delayed, the average delay is approximately 119 minutes.

Is a short connection safe after a GSP to IAH flight?

With 84% of GSP to IAH flights arriving on time and an average delay of 119 minutes when late, a connection under 60 minutes at IAH is risky. We recommend at least 75-90 minutes for domestic connections after this route.

GSP → IAH

GSP (Greenville) to IAH (Houston)

GSP (Greenville) to IAH (Houston) flights arrive on time 84% of the time. The most reliable airline on this route is SkyWest Airlines at 87%. The average delay is 119 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Source: Bureau of Transportation Statistics. Updated August 2026.

GSP → IAH on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

Better

This route is on time most of the time. About 84% of flights arrive on schedule.

Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Accurate?

Airlines are roughly equal on this route — SkyWest Airlines leads slightly at 87% vs United Airlines at 84%.

Airline Comparison

SkyWest Airlines leads at 87% on time; United Airlines trails at 84%.

Accurate?

Good to know

Departing from GSP

80% on time

Expect ~19 min sitting on the taxiway after your gate pushes back. GSP has long runway queues.

TSA is currently ~26 min. Best time: 4 AM (about 5 min).

GSP cancels 2.3% of flights — higher than average. Have a backup plan.

More about GSP →

Arriving at IAH

79% on time

When flights into IAH are late, the average delay is 77 minutes. Build buffer if you have ground plans.

If connecting at IAH: TSA is ~12 min right now. Allow at least 60 minutes for a domestic connection.

More about IAH →Connection times at IAH →

Flight cancelled or delayed?

Check what SkyWest Airlines owes you — refund rights, action plan, complaint email. Free.

Flying out of GSP? We'll brief you.

Delays, TSA, weather, gates — we'll let you know if something matters.

GSP Airport IAH Airport

Check the return: IAH → GSP

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Data last updated August 2026. Source: Bureau of Transportation Statistics.