Subway: Buy One Get One FREE 6″ Sandiches & Subs in April This post may contain affiliate links. Please see the full disclosure policy here. Posted on April 2, 2012 Written by Mary Leave a Comment Subway is offering Buy One Get One FREE 6″ Subs & Sandwiches in the month of April. Only valid before 9am. You can grab yourself a breakfast sandwich OR grab subs on your way to work – lunch will be taken care of!