The cap on match tickets has been in place since the start of the of 2016-17 season in a bid to make travelling to games more affordable and maintain the atmosphere at grounds.
Initially brought in for three seasons, top-flight clubs have now voted to extend the measures for away supporters by a further three years.
In a statement, the Premier League said: "All clubs know the crucial importance of away fans in generating the best possible atmosphere at matches, and recognise the additional travel costs often involved when following a team away from home.
"The £30 away ticket cap was introduced in season 2016-17, following the successful implementation of the Premier League Away Supporters' Initiative which saw clubs provide a range of measures for their away fans.
"For the last four consecutive seasons, Premier League crowds have reached record levels with 96% of tickets sold.
"This is testament to the compelling football and dedication of fans, and the league is committed to maintaining these high attendances."
The renewal of the measure has been welcomed by the Football Supporters' Federation - even if they feel more can be done.
FSF chief executive Kevin Miles said: "We welcome the Premier League's recognition of the importance of the £30 away cap and back its decision to keep the cap in place for the coming seasons.
"We have always argued that away supporter attendance needs to be encouraged if the atmosphere and spectacle of a live football match is to be sustained.
"There had been a rapid rise in away ticket costs for many supporters and the cap put a halt on that.
"However, we still believe more can be done and we call on the Premier League to look at ways to further reduce concessionary ticket costs and subsidise fans' travel costs when games are moved for TV."
