You could ask "How much does it cost per night to stay?" Or "How much will it cost for our stay" Also, for budgeting, you could add "so I can plan financials accordingly" or "so I can make sure to have enough money" but the hotel doesn't really need that information:)

You can say something like: "How much is it per night?" "How much is the stay?"

For example, when we want to stay at a hotel, we ask about the price there

It's not clear what you're asking. Please clarify.