Gustavo Rojas Pinilla International Airport is right in the town center and the runway ends at the beach. You must buy a tourist card (COP$105,000) on the mainland before boarding your San Andrés–bound flight, but the cards are sold at the gate and there's no chance you'll be allowed to board without one. Airlines that connect to San Andrés include Avianca, LATAM and Copa, and cities with direct flights here include Bogotá, Barranquilla, Cali, Cartagena, Medellín and Panama City.
Satena operates two flights per day between San Andrés and Providencia in low season (round trip from COP$600,000) and up to six per day in high season.
From the Airport
The airport is a 10-minute walk from the town center, or a flat-fare COP$15,000/7000 ride by taxi/moto-taxi. If you don't have much luggage, it's an easy walk. There's a left-luggage room at the airport (COP$5000 per item per 24 hours).
Conocemos Navegando provides pricey catamaran services between San Andrés and Providencia daily, except Tuesday, in both directions. Services depart from Muelle Toninos at 8am and return at 2:30pm the same day. You're supposed to arrive a full hour and a half before departure for registration. The journey takes three hours, and can be extremely rough. It's possible to visit Providencia on a day trip with this service, but it would be very rushed. Seats often sell out, even in low season, so it's important to book ahead.