Value offers from fast food chains over the past six months have helped attract price-conscious consumers. Burger King, like McDonald's and Taco Bell-parent Yum Brands, has been offering combo options for as less as $5 and $7. The company's Tim Hortons chain has benefited from several quarters of strong growth in revenue, particularly in Canada.

Shares of Restaurant Brands International Inc. are up 3% in premarket trading after the Burger King parent topped Wall Street’s profit and revenue estimates, boosted by better-than-expected consolidated same-restaurant sales.