Starting in 2025, travelers from the U.S., Europe, and various other countries will need to obtain an Electronic Travel Authorization (ETA) to enter the United Kingdom. Initially launched in 2023 for several Middle Eastern nations, the ETA program is set to expand to include non-Europeans from January 8, 2025, and European travelers from April 2, 2025. The application process opens on November 27, 2024, for non-Europeans and March 5, 2025, for Europeans.