From now till 18th September, enjoy a burger for just $1 with any upsized meal purchased. This promotion is exclusively in-stores only, and is available at all Burger King outlets except Airport branches. Limited to 1 order per upsize meal purchased. The $1 deal burger is limited to Fish Burger, Single Mushroom Swiss Burger, and BBQ chicken Burger. Promotion is not valid for Value Your Way meals, coupons, or any other ongoing promotions.