• Castellón (40km from Peñiscola) is operative since 2015, but has few destinations.
• Reus (120km from Peñiscola)
The list of destinations on the site of the airport is incomplete.
• Valencia (140km from Peñiscola)
• Barcelona (220km from Peñiscola)
From the motorway “Autopista del Mediterráneo” AP-7 take exit 43 to Peñíscola-Benicarló. Afterwards change to the national road “Carretera Nacional” N-340 until the crossing with the CV-141. Continue along the CV-141, which leads directly to Peñíscola.
Hife offers round trips from Barcelona and Valencia: https://www.hife.es/en
Some trips from Valencia to Peñíscola don’t seem to be listed, although if you search trips from Valencia to Barcelona, Peñíscola is usually listed as a stop.