Going to Singapore Flyer for free from City Hall MRT Station.
Free Shuttle Bus
From City Hall MRT, head towards ‘Exit B’, cross the road to Coleman Street. There is a bus stop next to St. Andrews Cathedral. Board the shuttle bus which swings by every half hour from 10.00am – 11.00pm. The shuttle bus takes you directly to the Flyer.
Walk
You can also walk to the Singapore Flyer from City Hall MRT Station. You can’t miss seeing the large Singapore Flyer.

the shuttle bus is not free.
but it states ‘Free Shuttle Bus’? :/