Runways
The airport covers 6,140 acres (2,480 ha) and has two runways:
- Runway 3/21: 11,002 ft × 150 ft (3,353 m × 46 m)
- Runway 8/26: 8,199 ft × 150 ft (2,499 m × 46 m)
Terminals
The terminal building at GEG consists of three primary structure, with Concourse A and B in the center, Concourse C to the southwest, and the Ground Transportation Center towards the north. The three structures have been built adjacent to each other and are connected.
Concourse A-B: The Concourse A and B complex was constructed in 1965, with a second level added in 1974. A retail space and expanded security checkpoints were added to the airport's three concourses in 2006, when the 'Rotunda' (which is home to the primary passenger facilities) was also given an aesthetic renovation. The airport plans to continue expansions, and add another concourse between 2020-2025.
Southwest Airlines is the current primary carrier operating from Concourse A, and Delta and United Airlines both operate from Concourse B.
Concourse C: Alaska Airlines and American Airlines currently operate from the upper-level gates, while Horizon operates from the lower level gates of concourse C.