If you come from one of the countries that have a visa-free agreement with Schengen, such as the United States, Australia, Canada, New Zealand and most European countries, you can travel to Portugal without a visa for up to 90 days. You should only apply for a visa in the following cases:
- If you come from a country that does not have a visa-free agreement with Schengen.
- If you are staying in Portugal for more than three months.