I don't know for sure about Amazon Prime now, but 2 years ago I forgot the charging cable for my smart watch and I ordered it from Amazon. My UK Prime membership wasn't valid in the US but I was able to start the free one month US membership, using my UK billing address. If you've never had a US account my guess is that you should be able to do the same for Prime Now.Hi all, want to order a few things on amazon prime now when we arrive. I have amazon prime in the U.K. will this account work in the US? Or do we need to have a US billing address? Was planning on ordering from the airport but don’t want to get there to find that we can’t order. Many thanks