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If I want to take cash from Portugal to the USA, should I exchange my money before leaving or after arriving?
My experience (from European countries, but not Portugal specifically) is that it's better to change in the European country, as many banks will give you US $ as a matter of course, while in the US (insular place that it is), it can be rather difficult to find a place to exchange money outside an international airport.  In fact, I have a few hundred Euros left from my last trip, several years ago.  Expected to make another trip which didn't come off, and haven't found a place to exchange them. PS: Just for information's sake, at the time I was working in Europe, and found that by far the easiest way to transfer part of my salary back home was to get $100 bills from my European bank.  Another way was to withdraw money from an ATM, as the US & European banks were on the same network.  Unfortunately the IRS put a stop to that, though I don't know if it was all banks, or just the particular one I was using.  Might be worth checking, though.