Looking for the simple subject.

How much does it cost to fly to Spain? Is the subject it?

Yes, the simple and complete subject is "it."

Thank you.

You're welcome.

To find the simple subject in a sentence, you need to identify the main noun that the sentence is about. In the given sentence, "How much does it cost to fly to Spain?" the main noun or subject is "it."

To break it down further:
- "How much" is an interrogative phrase, asking about the amount.
- "Does" is the helping verb indicating that the question is in the present tense.
- "Cost" is the main verb, indicating the action or state of paying a price.
- "To fly to Spain" is a prepositional phrase modifying the verb "cost" and explaining what it refers to.

So, in this sentence, "it" is the simple subject.