Overflow Parking Lot kicks in only when GSP fills up
GSP’s Overflow Parking Lot opens when the Garage A/B, Economy, and Daily Surface lots around the Main Terminal start to hit capacity, usually during peak holiday weeks or big regional events. It’s an airport-run option, not a third-party lot, so payment, rules, and security follow the same basic airport standards and posted rates as the other on-airport parking products at Greenville-Spartanburg International Airport (GSP).
The airport lists Overflow Parking as a separate type of parking alongside Garage A/B, Economy Parking, and Valet on the official GSP parking page, but it only appears on the website and on roadside signs when active. You won’t always see it on the live parking availability map at gspairport.com, which typically focuses on Garage A, Garage B, Economy, and Valet near the Main Terminal ticketing level.
Location details for the Overflow Parking Lot are intentionally generic: GSP describes it simply as an extra surface lot that opens when other airport parking options near the Main Terminal are full. Signage on GSP Drive and Aviation Parkway directs drivers to the Overflow Parking Lot with temporary or changeable message boards, the same way the airport signs point toward Garage A, Garage B, and the Economy lot when those still have spaces.
Rates for GSP parking currently list Economy at roughly $9 per day and garages higher than that per calendar day, and the Overflow Parking Lot typically tracks closer to the Economy price band when it activates. You always pay on exit, using the same mix of credit card and possible ticket machines that cover other GSP lots; the airport’s parking page notes that all on-site lots share common payment methods at automated or staffed exit plazas.
Plan for the Overflow Parking Lot to sit farther from the Main Terminal than the Economy lot that serves GSP’s single concourse, so build extra time into your walk or courtesy shuttle ride. Check GSP’s official parking page or roadside digital signs as you approach: if Economy still shows spaces and Overflow is active, skip the overflow gates and grab Economy instead for the shorter walk to check-in and TSA screening.