As the Lisbon to Sintra railway is an urban route, tickets and seats cannot be pre-booked. However there is no real need, as there are usually plenty of free seats. Advice: Due to the popularity of Sintra, there can be long queues at Rossio station for tickets.

Yes, you can buy tickets for the train from Lisbon to Sintra online via the official CP (Comboios de Portugal) website or mobile app, but there is a major practical caveat for 2026 travelers. While the CP platform allows for online purchases of "Alfa Pendular" and "Intercidades" (long-distance) tickets up to 60 days in advance, the Lisbon-Sintra route is a "Urbano" (suburban) service where seat reservations are not possible. Many frequent travelers find it easier to simply use a Navegante card (rechargeable "Zapping" credit) or a Lisboa Card, which allows you to tap-and-go at the station turnstiles without needing a specific paper ticket. If you do buy online, you will receive an SMS or digital confirmation, but you still must ensure you have a valid supporting card to "load" the fare onto if required by the gate. For the most seamless experience, buying a "Train & Bus" day pass at Rossio or Oriente station is often preferred, as it covers both the rail journey and the essential 434/435 tourist buses within the Sintra hills.