As of March 2026, Lisbon Humberto Delgado Airport (LIS) is experiencing significant and often record-breaking queues, particularly at passport control for non-EU travelers. These delays are primarily driven by the full rollout of the EU's new Entry/Exit System (EES), which requires biometric registration (facial scans and fingerprints) for travelers from the U.S., UK, Canada, and Australia. In early 2026, some passengers reported wait times of up to 7 hours, leading the Portuguese authorities to temporarily suspend the system to clear the backlog. While the situation is being managed with additional staff and more biometric kiosks, the "EES chaos" remains a major factor. For 2026 travelers, it is highly recommended to arrive at least 4 hours before an international flight and to use the "Electronic Passport" gates whenever possible if eligible. Beyond immigration, the airport's infrastructure is currently operating at overcapacity, meaning security and check-in lines can also be lengthy during peak morning and evening surges. Always check the airport's live status or your airline's app for the most current wait-time alerts before heading to the terminal.