Do you need a passport to go from Spain to Portugal?
If you're European citizen your country national ID will suffice. If you're a non European than you'll need your passport anyway staying in Spain, in Portugal or travelling from one to another.
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Best Places to Travel Without a US PassportPuerto Rico. US Virgin Islands. Northern Mariana Islands. American Samoa.
Border crossingsSpain has FOUR European land borders. Two are with Schengen countries (France and Portugal), so routine immigration and customs checks do not take place on crossing the border - see the Schengen Agreement section below for more information.
Moreover, when you get to Europe, you will still need your passport as it is your identification document. You can use it to book hotels, get local SIM cards, prove your identity to the authorities, and move from one region to another.
List of countries for which a passport that expired up to 5 years ago is admissible: Belgium, France, Austria, Luxembourg, Switzerland, Liechtenstein, Monaco, Netherlands and Portugal. List of countries for which a passport that expired for up to 1 year ago is admissible: Germany, Hungary and the UK.
An expired passport is invalid. If you are traveling back to the United States on a direct flight, you can fly with an expired passport. However, this only applies if you get the go-ahead from the relevant embassy. However, you cannot fly out of the country with an expired passport.