As many as 42,000 premises across Wales will receive access to superfast broadband by June 2017.
The move comes as part of the ongoing Superfast Cymru project, which is working alongside BT to ensure coverage in Wales reaches 96 per cent by the end of 2016.
So far, around 480,000 premises across Wales have benefitted from the scheme, equating to 79% coverage.
The current project has already been boosted by £205 million of public funding, with £57 million from the central Government’s Broadband Delivery UK programme.
This latest deal is reportedly set to be supported by both BT and Airband.
BT Director for Wales Ann Beynon said: "This extension to the Superfast Cymru programme, which BT is helping to fund, will not only enable us to reach some of the most remote parts of the country, but will also be enabling businesses in suburban areas, who want to, to access some of the fastest broadband speeds in the UK.
"Every day the internet is touching our lives in new and exciting ways, providing new opportunities to connect and communicate at home and in the workplace, which is why today marks another important development for Wales."
It is the latest boost for Airband, which has already won contracts to deliver broadband coverage in Dartmoor and Exmoor National Parks in England.
In a statement, the company said: "We are delighted to have won the tender for the Superfast Cymru Infill Project.
"Airband has an extensive network across Worcestershire, Shropshire, Herefordshire and Powys, which delivers superfast broadband to rural communities across these regions.
"We are now looking forward to rolling this out across Wales to improve broadband speeds and accessibility and provide better connectivity for businesses across the country."