April 26 (Reuters) - Restaurant Brands International Inc QSR.TO QSR.N , the owner of Burger King and Tim Hortons, reported better-than-expected quarterly profit and revenue as the two chains opened more restaurants.

Net restaurant growth at Burger King was 5.1 percent, while it rose 4.6 percent at Tim Hortons.

However, comparable sales growth slipped 0.1 percent at Tim Hortons and Burger King and fell 0.2 percent at Popeyes Louisiana Kitchen.

Restaurant Brands bought Popeyes Louisiana Kitchen for $1.8 billion in February to use its international reach to introduce Popeyes' Louisiana-style fried chicken and buttermilk biscuits to more diners globally.

Restaurant Brands' net profit attributable to shareholders was $50.2 million in the first quarter ended March 31, largely unchanged from $50 million a year earlier.

Earnings per share was unchanged at 21 cents.

Excluding items, the company earned 36 cents per share, beating analysts' average estimate of 35 cents, according to Thomson Reuters I/B/E/S.

Oakville, Ontario-based Restaurant Brands total revenue rose 8.9 percent to $1 billion, beating analysts' average estimate of $990.3 million.

(Reporting by Ahmed Farhatha in Bengaluru; Editing by Sriraj Kalluvila) ((Ahmed.Farhatha@thomsonreuters.com; within U.S. +1 646 223 8780, outside U.S. +91 806749 6568; Reuters Messaging: ahmed.farhatha.thomsonreuters.com@reuters.net))