Traveling from Lisbon to Sintra is one of the most affordable and efficient day trips in Europe. As of 2026, a one-way ticket on the CP (Comboios de Portugal) regional train costs 2.40€. If you are using the "Navegante" (formerly Viva Viagem) reusable card, the fare is deducted from your "zapping" balance. If you don't have a card, you will need to pay an additional 0.50€ for the physical card itself, which can be reloaded for future trips. The trains depart frequently—roughly every 15 to 20 minutes during peak hours—from the beautiful Rossio Station in central Lisbon or the Oriente Station near the airport. The journey takes approximately 40 minutes and delivers you directly to the town center of Sintra. For tourists planning to explore the various palaces, it is important to note that the train fare only covers the transport to the town; you will need to pay separately for the local "434" tourist bus that climbs the steep hill to Pena Palace and the Moorish Castle. Overall, for less than 5€ round-trip, the train remains the undisputed best value for visiting this UNESCO World Heritage site.