The former Manchester City defender was impressed with the passion displayed by the Green Force supporters inside the Gelora Bung Tomo Stadium during their friendly game
Adel Taarabt and Bobby Zamora secured victory for the Hoops as they came from behind to overcome Persebaya 2-1 after conceding the opening goal to Fernando Soler in their final Asia Tour fixture, and Onuoha admitted the atmosphere in the stadium was the best he ever played in.
"It was incredible from the moment we left the hotel to make our way to the ground, but the atmosphere inside the stadium itself was unreal," Onuoha said on the club's official website.
"That's the best atmosphere I've ever played in. It wasn't intimidating, because they were friendly in their manner and just really wanted to support their team.
"It wasn't really hostile, just incredibly loud, passionate and exciting.
"It's great to see how passionate the fans are out here and that's one thing that has really hit home throughout this tour."
The 25-year-old defender also insisted that his first visit to Asia has become one of the more memorable moments of his life.
"I won't forget this trip for a long, long while. Some of the things I've seen and heard will stay with me forever," he added.
"The passion that the Asian fans have for football is incredible, and that was epitomised by the Indonesian people last night."
Mark Hughes' men are scheduled to head back to London on Tuesday after their 12-day on Asian tour.