Quezon City is 28 times larger than San Juan, Metro Manila.
Area: 165 km2 calculated
Quezon City is one of the cities that make up Metro Manila, the National Capital Region of the Philippines, located on the island of Luzon. It is the most populous city in the country, and the largest city by area in Metro Manila. Quezon City was named after Manuel L. Wikipedia
Area: 6 km2 calculated
San Juan is a city in the Philippines. It is one of the cities that comprises Metro Manila, the National Capital Region of the Philippines. It is the smallest city in the country in terms of land area. Wikipedia