Yes, flights from the United Kingdom to the Isle of Man are considered domestic flights, as the Isle of Man is part of the Common Travel Area (CTA). In 2026, this means you do not have to clear traditional international immigration or passport control when flying from London, Liverpool, or Manchester to Douglas. However, because the Isle of Man is a self-governing British Crown Dependency and not part of the UK itself, you are still required to show a valid photo ID (such as a driver's license or passport) to the airline at the boarding gate for security purposes. Furthermore, the Isle of Man has its own VAT and customs rules; while you won't face a "border guard," you are still subject to certain "Customs & Excise" limits on tobacco and alcohol. For 2026 travelers, the journey feels as seamless as flying between London and Edinburgh, but you should always carry your passport just in case of an unplanned diversion to an airport outside the CTA.