The international airport of Asturias (airport code OVD) is located around 60 km from the ECSC (Mieres). Monday to Friday there are hourly shuttles (every full hour) from the airport to Oviedo, on weekends the shuttles run on every even hour. A single ride costs 6.15 Euro and takes about 40 minutes. Check the bus company Alsa for details.
From Oviedo there are frequent buses and trains to Mieres.
A single train ride from Oviedo to Mieres costs 1.45 Euro, a ten ride ticket costs 10.10 Euro (however, one has to get a special rechargable card for this). The train ride takes between 20 and 25 minutes, depending on the train. Check the train company Renfe for details.
A single bus ride from Oviedo to Mieres costs 1.60 Euro, a ten ride ticket (CTA), which is also valid for the train, costs 11 Euro (however, one has to get a special rechargable card for this). The bus ride takes between 35 and 50 minutes, depending on the traffic. Check the bus company Enferbus and the Consorcio Transportes Asturias (CTA) for details.
The ECSC is about 10 to 15 minutes walk from the center of Mieres or the train station Mieres-Puente, and only 2 minutes walk from the bus station Mieres.