The Southside Flyers were too big, too experienced and too good, beating the Perth Lynx 115-81 in game three of the WNBL grand final series to clinch the championship.

The Flyers had to do it the hard way just to get to the grand final, beating cross-town rivals the Melbourne Boomers in three games in the semifinals before the Lynx blew them away in game one of the title series.

Southside regrouped and their size and experience shone through as they got the series back on their terms with a thrilling game-two win in Perth on Thursday night.

That took the series back to Melbourne for the decider on Sunday and the Flyers were never going to be denied as they romped to the 34-point victory on Sunday for the franchise's fifth championship, and second since being rebranded as the Southside Flyers.

The Flyers were able to get the game on their terms by keeping it at their pace to maximise their strengths, and they began to assert their control with the opening 10 points of the second quarter.

Southside went on to lead 52-39 by half-time and then it was Carley Ernst who blew the game open for good late in the third period. She hit three triples in the space of two minutes.

That saw the Flyers lead balloon to 24 points and the final quarter was party time with 42-year-old all-time great Lauren Jackson (12 points, six rebounds) winning a sixth WNBL championship and first since 2010.