Whataburger is offering FREE Iced Coffee on June 20th in honor of Summer Solstice. The 16-ounce iced coffee will be available from 6am to 6pm local time and can be customized “just like you like it” with one of their three new flavors — Vanilla, Caramel or Mocha. No purchase necessary. Claim your complimentary Iced Coffee in-store, at the drive-thru, online at Whataburger.com, or on the popular Whataburger App for Curbside pickup or delivery on orders placed through the app.