You'll need prior authorisation to enter the United States using a British passport, either through a visa, a Permanent Resident Card, or the Visa Waiver Programme.

British citizens generally do not need a traditional visa for Hawaii, as they are eligible for the Visa Waiver Program (VWP). However, you must obtain an ESTA (Electronic System for Travel Authorization) before you can board your flight. The ESTA is an automated system that determines the eligibility of visitors to travel to the U.S. for tourism or business. In 2026, the application fee is roughly $21, and it is valid for two years (or until your passport expires). You must apply online at least 72 hours before departure. If your ESTA is approved, you can stay in Hawaii (or any part of the U.S.) for up to 90 days. If you have a criminal record, have been denied entry previously, or have visited certain countries (like Iran, Iraq, or Cuba) recently, you may be ineligible for the VWP and would then be required to apply for a full B1/B2 Visitor Visa at a U.S. Embassy. Ensure your British passport is a "biometric" version (with the camera symbol on the cover), as this is a strict requirement for the Visa Waiver Program.