Lamine Yamal and Ferran Torres struck twice, with Robert Lewandowski, Andreas Christensen and Gavi also on the scoresheet.
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Flick remarked afterwards: "In the first half, we had a good start and then we were a little sluggish, but we returned to a great level in the second half, with Gavi, Ferran, Marcus ...
"What I've seen from Gavi is exactly what I want to see, pushing the team, as captain... We already saw him at the end of last season and he was at a very good level.
"He can play in both positions, number 6 and number 8."
Flick also said: "Each player had 45 minutes. It was more important to take care of Eric and Iñigo, who were both experiencing discomfort. In the end, I'm very happy."