One division, the Grand Prairie, which has 18 Parks in the US, Mexico and Canada, said attendance rose 22% from a year earlier to 5.2mln guests.
In the latest quarter, revenue jumped around 18% to $217.5mln, with its Halloween and winter holiday events proving particularly popular.
Analysts had expected a loss of 3 cents a share on revenue of $193mln.
The firm has said it is looking to build its profile abroad, particularly in China and the Middle East.
For 2015, Six Flags reported a profit of $2.2mln, or 2 cents a share, compared with a loss of $34.1mln, or 37 cents, a year earlier.
Six Flags exited bankruptcy-court protection in May 2010, having been hurt by a heavy debt load and declining attendance during the recession.
The company also said its board has been split up, with Jim Reid-Anderson staying as executive chairman while relinquishing the president role, while the chief executive title will go to John Duffey, who has also been appointed a director of the company.
Shares were more than 2% higher in early deals at $52.51.