MADRID, July 19 (Reuters) - Spanish telecom operator Telefonica said on Saturday it would cut its debt by 200 million euros ($169 million) after selling a controlling stake in its optic fibre network in Colombia to buyout fund KKR .

The Spanish company plans to spin off the unit and keep a 40% stake, while a local unit of KKR would take the rest. The operation values the fibre network in Colombia at $500 million.

KKR intends to expand the coverage to 4.3 million households in the country by 2024 from 1.2 million at the moment, the buyout fund said in a statement.

The transaction still requires regulatory approvals, both companies said.

The sale is part of a wider Telefonica plan to reduce its debt by selling assets.

($1 = 1.1805 euros) (Reporting by Cristina Galan and Flora Gomez; Editing by Inti Landauro and Edmund Blair)