Instead of fluctuating, the conversion is always the same: 1 USD is worth 3.6725 AED.
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The budget a person must have to visit Dubai for a week can vary significantly depending on several factors, such as the type of accommodation, mode of transportation and meals. Generally, a budget of around 1000 USD per person should suffice for a week's stay in Dubai.
Therefore, you do not necessarily need to exchange money before traveling to Spain if you plan on using your card for most transactions. Just make sure that your credit card waives international card transaction fees, otherwise, those fees will add on very quickly.
Advantages of using cashIf your spending discipline breaks down when you use credit cards, cash may be a better choice while you let loose on vacation. No foreign transaction fees: Many credit cards charge an extra fee of up to 3% on purchases made outside the country, although you can find cards that don't.