Question : How long do most people visit Madrid?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : What is the cheapest round-trip ticket you can get to Madrid?
Answer : China Eastern Airlines is your best bet for finding that coveted low fare. They're offering fares as low as $644, while prices for other flights are as high as $658.
Question : Are you paying the cheapest or highest price for your ticket to Madrid?
Answer : Flight prices fluctuate much less than most routes from China for XMN to MAD. They range from $644 to $658. The further out you book a route, the more likely you are to save.