The San Juan airport is one of the worst places for a celiac or someone with a gluten allergy. I started at Margaritaville, and they were kind enough to point me across the path to La Vendimia.
The staff was super knowledgeable of gluten and they were happy to help me. There are several things on the menu that are safe, and they were happy to verify everything with the kitchen.
— Somewhat
— No gluten-free information on the menu
— Some
— Excellent