Whether you go through Customs at Lisbon Humberto Delgado Airport (LIS) depends entirely on your point of origin. If you are arriving from another country within the Schengen Area (such as Spain, France, or Germany), you generally do not go through traditional Customs or Passport Control, as you are traveling within a common travel zone. However, if you are arriving from a non-Schengen country (such as the United States, Canada, the UK, or Brazil), you must first pass through Passport Control (Immigration) and then collect your luggage. After reclaiming your bags, you will walk through the Customs area. Most travelers with nothing to declare simply walk through the "Green Channel," but you are still subject to random spot checks by Portuguese authorities looking for prohibited items or excess currency. If you are just connecting in Lisbon to another Schengen destination, you will clear Immigration in Lisbon but typically clear Customs at your final destination.