How reliable is Greenville Spartanburg International Airport?
Flights from GSP departed within 15 minutes of schedule in 84% of 95,224 flights in official BTS history — and weather is calmest in Jun. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the departure punctuality at GSP looks like
On-time departures
across 95,224 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
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Weather by month
When the weather works for you at Greenville
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 94/100 favorability
Roughest month
Most disruptive — low visibility & fog, thunderstorms · 82/100 favorability
The read on GSP
What the numbers say about flying through Greenville Spartanburg International Airport
Across official performance history, flights from Greenville left within 15 minutes of schedule about 84% of the time over 95,224 flights. That's a solid, better-than-average operational record. Pair it with a moderate cancellation rate of 2.3%. When a departure does run late, the typical delay is around 10 minutes.
On weather, Greenville is an unusually calm-weather airport year-round. June is the calmest stretch for flying, scoring 94 out of 100 for favorable conditions, while December is the most disruptive at 82, driven mainly by low visibility & fog and thunderstorms. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Greenville, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about GSP
- How reliable is Greenville Spartanburg International Airport (GSP)?
- Flights from Greenville left within 15 minutes of schedule roughly 84% of the time across 95,224 flights of official history — a solid, better-than-average operational record. The cancellation rate runs about 2.3%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from GSP for good weather?
- June has the calmest flying weather at Greenville Spartanburg International Airport. December is the most disruptive, mainly from low visibility & fog and thunderstorms.
Planning a trip through Greenville?
Score real flights to and from GSP on reliability, weather, and connection safety — not just price.