Which credit card does not charge foreign transaction fees?
Keep in mind that the various Caminos are a "Cash" economy. Credit cards are seldom accepted along the way except at the larger hotels in the larger towns.
Your very best plan will be to use a debit card and the quite numerous ATMs along the way.
Some suggestions on using ATMs:
1. Take enough out to last 3-4 days in order to minimize any ATM fees. ..but do not carry large sums of money. Don't discuss the money you are carrying with anyone.
2. It is best to have two separate cards so that you will still have access if a machine eats your card. I use two different banks/CU debit cards.
3. Do not use the ATM when the bank is not open such as the weekends. You will not be able to go inside to sort out a problem if the machine eats your card.
4. Notify the card issuer of your travel before you go. The card will be shut down on first use in a foreign country if you do not.
5. Be cautious when using the ATMs...look around and insure that no one is lurking.
6. ATMs are very easy and reliable in Spain and Europe....do not fear them.
7. Chipped Debit cards ARE NOT required in ATMs at this time.
8. Only 4 digit pass code numbers will work. Be aware that most European ATM keyboards do not have letters included. Be sure you know your code by number and not alphabetical.
European ATM keyboards often have the numbers starting with "1" on the bottom row and "7" on the top row...much like the number pad on most computer keyboards.
9. Keep your money in a secure place...on your person...never in your pack. Spread it around a bit so it will not all be lost at once.
Much of this is just common sense and you have heard it numerous times...but there are many who are going on their first international adventure and find these type of reminders very useful.