(Adds comparable sales for Burger King, compares with estimates)
Oct 24 (Reuters) - Restaurant Brands International Inc reported a quarterly profit on Wednesday that missed analysts' estimates as its Burger King unit struggled in a fiercely competitive U.S. market, offsetting gains in its Tim Hortons cafes.
Comparable sales at Burger King rose 1 percent in the third quarter, compared with a 3.6 percent increase a year earlier.
Restaurant Brands has been investing heavily to attract more diners to Burger King by introducing cheaper-priced meals in the face of stiff competition from McDonald's Corp and Yum Brands Inc's Kentucky Fried Chicken.
Last month, Burger King added Crispy Chicken Tenders to its menu.
The company's efforts to refurbish its Tim Hortons coffee chain paid off, with comparable sales rising 0.6 percent, from 0.3 percent increase a year earlier.
Net income attributable to the shareholders in the company rose to $136.5 million, or 54 cents per share, in the three months ended Sept.30, from $91.4 million, or 37 cents per share, a year earlier, based on accounting standards used until the fourth quarter of last year.
Total revenue fell to $1.18 billion from $1.21 billion.
The company said it had a profit of $133.6 million and revenue of $1.38 billion under new accounting standards applied since the first quarter.
On an adjusted basis, the company earned 63 cents per share.
Analysts on an average had expected a profit of 65 cents per share on a revenue of $1.38 billion, according to Refinitiv data. (Reporting by Laharee Chatterjee in Bengaluru; Editing by Sriraj Kalluvila)