Giant Pizza King - El Cajon Giant Pizza King – El Cajon (located on Cajon Blvd in San Diego, CA) offers a great selection of pizza dishes all specialty items done Cajon style with fresh and flavorful ingredients. Beside pizza, Giant Pizza King also specializes in making great vegetarian meals and sandwiches for those on the go. Now, at Giant Pizza King you can order all their menu items online using your computer and have them delivered right to the door of your home for a minimal charge of $2.50, provided your order is over $15. Giant Pizza King is open 11 a.m. to 9:30 p.m. daily to meet your family’s meal needs. Giant Pizza King accepts all major credit cards. Order Online Payment Options