Main Terminal

13 gates, one checkpoint, and two short concourses

The Main Terminal at GSP runs on a simple plan: a single departures level with one central TSA checkpoint feeding 13 gates split into Concourse A and Concourse B. Delta uses Concourse B, while Allegiant Air, American Airlines, Southwest Airlines, and United Airlines all run out of Concourse A. You check in on the upper level, clear the central security line once, then walk straight into the fork where A goes left and B goes right.

From curb to gate usually runs fast here because the terminal stays small by design. Check-in counters for American, Delta, Southwest, United, and Allegiant sit along the same departures hall, so you can walk from one airline desk to another in under 2–3 minutes. Security is centralized in the middle of this level, so you are never more than a short walk from the checkpoint, even if you get dropped off at the wrong end of the curb.

Inside the secure area, the terminal stays basic: 13 boarding gates, standard seating, restrooms near the concourse junction, and a few vending-style options that change over time rather than a fixed restaurant row. Reviews keep repeating the same theme: the boarding areas feel comfortable and modern enough, but services remain fairly minimal compared with big hubs like ATL or CLT. Plan on grabbing coffee or a meal before arriving if you care about specific chains or hot food choice.

One small but useful feature sits near the central concourse intersection: large flight-status monitors that show an eastern U.S. map with live aircraft positions alongside departure boards. Regulars use that map to sanity-check delays on Delta toward Atlanta or American toward Charlotte before even opening an app. If you like watching traffic, stand by those screens for a few minutes and you get a real-time picture of how the morning or evening bank is running.

Layout is as straightforward as it looks on the map: a short central spine from security, then Concourse A and Concourse B spin off left and right with only a few minutes’ walk from the split to the end of either wing. With only 13 gates, gate changes rarely mean more than a 2–5 minute walk, and you can see most of the hold rooms from the main spine. That simplicity is why regulars treat GSP as an easy in-and-out airport rather than a place to linger.

Services mirror the terminal size, so set expectations accordingly. You will find restrooms by the gate areas on both concourses, a couple of grab-and-go points depending on current vendors, and standard power outlets scattered near seats but not at every chair. There are no catalogued airline lounges in the Main Terminal, so Delta, American, United, and Southwest all board straight from the public gate areas without club access. If you want a quiet spot, walk toward the end gates of Concourse B on off-peak hours, where Delta’s smaller schedule leaves a few hold rooms less crowded.

Complaints tend to land on the same tradeoff: GSP stays small and easy to use, which also means limited food, retail, and no lounge network past security. Travelers who fly here often mention they like the quick curb-to-gate time enough to accept those gaps. Think more along the lines of a polished regional terminal than a full shopping concourse; if you want a sit-down meal, build that into your plan in Greenville or Spartanburg before you head for the airport.

One practical tip: for early flights on American, Delta, Southwest, United, or Allegiant, arrive 75–90 minutes before departure, clear the single security checkpoint, then grab a seat near your gate and use the big eastern U.S. map display to track your inbound aircraft before boarding starts.