UK ETA Validity refers to the duration for which an Electronic Travel Authorisation remains active for travel to the United Kingdom. The UK ETA Validity is generally two years from the date of approval or until the linked passport expires, whichever comes first. During this period, travellers can enter the United Kingdom multiple times for short stays, such as tourism, business, or transit, usually up to six months per visit depending on eligibility. The ETA is electronically attached to the passport and does not replace immigration permission at the border. A new application is needed if the passport is renewed.