(Be aware that the ticket offices are often busy at the popular metro stations, such as the airport.) You can use credit cards or cash (euros) to purchase transportation tickets, although cash is needed when you buy the tickets on the bus or tram.
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Fares and Passes. Flat fare on the buses is €1,80 - cash paid on board. Flat fare on the trams (streetcars) is now 2,85 Euros with the object being to make more users buy pre-pay passes. A single ticket on the metro is €1.90 without a rechargeable card, €1,40 with.
You can pay using the Viva Viagem card, which is super handy for all public transportation in Lisbon, or you can buy a 24-hour transport ticket, or you can simply pay cash as you board the bus. Most buses run until 11:00 PM, and there are even night buses that cover specific routes.
Regional trains are often cheaper and some lines very scenic, but it's almost always quicker to go by bus – especially on shorter or less obvious routes. You'll obviously have a great deal more flexibility if you drive, and you'll be able to visit more out-of-the-way places in a short trip.
Lisbon Taxis: Payment MethodsAlthough your taxi driver will likely accept payment via debit or credit card, this is not a rule. Hence, you should always carry some euros with you, as many taxis aren't equipped with a POS machine. In that case, bank card payments are out of the question.
Fares are good value: the Lisbon–Porto express route and Faro–Lisbon both cost around €20. Under-4s travel free, under-13s half-price, and there are discounts for under-29s and senior citizens over 65 with relevant identification.
Paying with cash in PortugalThere are going to be situations when you need cash on your trip. For example, some places won't take cards if you're spending less than 10 to 20 euros — other merchants won't take cards at all.