The German coach celebrated his first competitive match at the helm with three points as Barca came from behind against Ruben Baraja's solid Valencia side.
Hugo Duro sent the hosts ahead after 44 minutes but veteran Polish striker Lewandowski levelled from close range before the break and netted a penalty early in the second-half.
Barcelona started their bid to steal the crown from champions Real Madrid with an impressive result at Valencia's rowdy Mestala Stadium.
Barca were without key players, including Frenkie de Jong.
Gavi and Ronald Araujo and Flick selected three 17-year-olds in his starting line-up.
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US blamed for expo row
Analysts warn exclusion could have dire consequences for SA down the line.
4900 visas for critical skills jobs
South Africa has a list of almost 150 jobs considered by the department of employment and labour (DEL) to be in short supply.
Nsfas to decentralise
Department welcomes move, plans to set up regional, satellite offices.
Lawsuits cost health billions
Investigations stop R3 billion in fraudulent claims, parliament hears.
City face Inter reunion
Manchester City are braced for their Champions League reunion with Inter Milan at the start of an expanded tournament that will be \"so tough\" for the 2023 winners.
League Cup no inconvenience
Manchester United manager Erik ten Hag insisted he still believed English football's League Cup remained a \"significant\" competition.
State of rates in Africa
Africa’s largest economies to make changes for first time in years.
RAF not about to 'implode'
»» Improvements not sustainable without legislative changes, says Letsoalo.
Can Superbalist grow?
Shein overtakes the SA retailer, while Bash is different kind of threat.
Crochet gets sex appeal
100% cotton yarn garments do not loose shape ina cold wash.