TSA PreCheck works for international flights primarily during the departure phase from a U.S. airport. If you are flying on one of the 90+ participating airlines (including major international carriers like Emirates, British Airways, and Lufthansa), you can use the dedicated PreCheck lanes for expedited security screening before you board your flight. This means you do not have to remove your shoes, light jackets, or belts, and your laptop and compliant liquids can stay in your bag. However, it is important to understand that TSA PreCheck does not help you with the immigration or customs process when you land in a foreign country, nor does it expedite your return to the U.S. For the return journey, travelers typically look to Global Entry, which is a separate Trusted Traveler Program specifically designed to speed up the re-entry process through U.S. Customs and Border Protection. In 2026, many frequent flyers carry both, often using a premium credit card to cover the application fees for a combined membership that handles both the "fast security" on the way out and the "fast customs" on the way back.