This can be confusing but the best value is a Viva Viagem card and the easiest place to buy one is from the ticket machines at any metro station. It's €4 for a one-day pass (valid 24 hours from time of purchase) and that covers metro, trams, buses and funiculars. When you want to renew it will cost €3.50 a day. You can also use it for ferries as all the ticket barriers are electronic.

If you arrive at the airport a ticket on the airport shuttle bus costs a flat fare of €3 and is valid for a day's travel on public transport. The Viva Viagem card is not accepted on the airport bus though.

As the shuttle is fairly infrequent and can get very crowded (though fun for the running commentary) if you haven't much luggage I would seriously consider, especially for your return trip, catching an ordinary bus to just outside the airport (check the route map) or take the metro to Olivais on the red route and it's a pleasant 20 minute walk to the terminal.

In fact I would also recommend taking a metro to a random station, getting out and exploring. The metro stations are invariably clean, modern, efficient and uniquely decorated with tiles and murals.

Any metro station is easiest.

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