As of 2026, if you are a British or Irish citizen, you can technically fly on domestic UK routes with EasyJet without a physical passport, but you must have a valid form of government-issued photographic identification. According to EasyJet's current policy, acceptable alternatives for domestic flights include a valid driving license (provisional or full), a photographic EU or Swiss National Identity Card, or even a recently expired passport (up to five years out of date for domestic use only). However, the rules are very strict: a birth certificate, library card, or digital photo of an ID will not be accepted. If you are not a UK or Irish citizen, you are almost always required to have a valid passport even for internal flights to satisfy potential immigration checks. For any flight crossing an international border (including the Republic of Ireland), a valid passport is mandatory for everyone. It is always safest to carry your passport even on domestic hops to avoid any confusion at the gate.