The South Australian opposition will introduce a flat 50-cent fare across the metropolitan public transport network if it wins government at the March 2026 state election.

The policy, which the Liberals said would cost taxpayers $240 million over four years, would also extend to bus services in regional areas.

It is one of the party's most significant election pledges to date, announced exactly six months out from polling day.

But the Labor government has slammed the plan, which Premier Peter Malinauskas said was "underfunded to the tune of $75 million dollars".

Making the announcement on Sunday, Opposition Leader Vincent Tarzia said the policy offered relief for families struggling with the cost of living.

He said, under the scheme, a family of two parents and two students would save

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