"Rede Expressos is offering tickets for €4.99 from Lisbon to various destinations such as Porto, Fátima, Aveiro, Coimbra, Faro or Portimão and Lisbon-Évora at just €3.95", according to Notícias ao Minuto.

These promotions are valid for tickets purchased on the carrier's website or on the myRNE app.

"The availability of tickets on sale is limited", warns Rede Expressos.

At an international level it is possible to travel from Porto to Madrid for nine euros, "with daily routes and stops in Aveiro, Viseu, Guarda and Salamanca, being available on all sales channels: ticket offices, call centre, website or app myRNE".