Fast-food chains are winning back customers with meal deals. Will the good times last?

Limited-time discounts are getting people back in the door at quick-service restaurants, but such gains could be fleeting when the deals disappear.

Fast-food restaurant chains have been seeing an uptick in traffic over the past two months due to the success of limited-time deals and promotions, along with an early rollout of the holiday season, according to Revenue Management Solutions (RMS), a company that analyzes data and provides insights about the restaurant industry.