Estonia's opposition liberal Reform party won Sunday's general election, outpacing the centre-left party of Prime Minister Juri Ratas with a surging far-right group in third place buoyed by a backlash from mostly rural voters in the Baltic eurozone state.

Led by former MEP Kaja Kallas, Reform garnered 28.8 per cent of the votes, well ahead of Ratas's Centre party on 23 per cent, with the far-right EKRE more than doubling its previous election score at 17.8 per cent, according to full results, Estonia's official state elections website said.

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