Dublin Airport is one of only a few airports outside North America that offers a US Preclearance facility. The benefit is that having cleared
Do you have to go through US Preclearance in Dublin?
If you are travelling from Dublin to the US on your connecting flight you can use the Preclearance facility in Dublin and will not have to go through US customs when you land.
How Long Does US Preclearance take in Dublin?
The current recommendation is to allow three hours for US Preclearance at Dublin Airport. Be sure to consider that when booking flights if you are connecting via Dublin.