For a standard connection at Dublin Airport (DUB) in 2026, the minimum connection time (MCT) is generally 60 to 90 minutes, but this depends heavily on your route. If you are arriving on an international flight and connecting to a U.S.-bound flight, you should allow at least 3 hours to account for U.S. Preclearance, where you clear U.S. Customs and Border Protection in Dublin before you even take off. For domestic or UK connections, 90 minutes is usually sufficient as long as your bags are checked through. If you are switching between Terminal 1 and Terminal 2, or if you have to "self-transfer" (collect and re-check bags), you should budget a minimum of 4 hours. Dublin's terminals are connected by a covered walkway, but security and immigration queues can fluctuate, making a 2-hour buffer the "gold standard" for a stress-free transit through Ireland’s busiest hub.