The closest airport is León airport (LEN), however there are no many flights and they are sometimes pricey. LEN airport has flights to Barcelona (BCN), Ibiza (IBZ), Palma de Mallorca (PMI) and Málaga (AGP). Asturias airport (OVD) is 176 km from Celadilla del Páramo, and it can be reached by public transport. Car rental is available at the airport and Asturias is a beautiful area to visit. OVD airport offers many flights with several Spanish and European airports (Paris, Milan, Roma, Venice, Lisbon, London, Amsterdam, Dusseldorf, Munich, Frankfurt, Brussels). Valladolid airport (VLL) is 136 km from Celadilla, there is direct coach to León from the airport. VLL has a limited offer of flights, these include Palma de Mallorca (PMI), Barcelona (BCN) and Tenerife (TFN). A Coruña (LCA) and Santiago (SCQ) airports are around 3h drive. These airports are not that easy to reach with public transport from Celadilla. Madrid-Barajas airport (MAD) is 360km from Celadilla, there is public transport available but it can take around 4 hours. Contact me if you have any doubts.