Retalhuleu Airport (IATA: RER, ICAO: MGRT) is a small domestic airport located in Retalhuleu, the capital of the Retalhuleu department in southwestern Guatemala. It serves the Pacific coastal plain region known locally as the Costa Sur, supporting light aviation, charter flights, and limited commercial services. The airport has a single runway and modest facilities suited to small and medium aircraft. It primarily serves general aviation, agricultural operations, and occasional regional passenger flights rather than large-scale commercial traffic. Retalhuleu is situated in one of Guatemala's most productive agricultural regions, and the airport plays a supporting role for agribusiness and private travel in the area. The city itself is known as the 'Capital of the World' among locals due to its cultural amenities relative to its size.