Knowing the UK ETA Validity is important before planning your journey. Once approved, the ETA remains valid for the period specified by the UK authorities or until the linked passport expires, whichever comes first. During its validity, eligible travellers can make multiple short visits to the United Kingdom, provided each trip complies with UK immigration rules. Travellers should always check the expiry date of both their ETA and passport before booking travel to ensure they remain valid throughout the journey.