About 2.3 million applications were made for the initial one million tickets that were released last year.
Organisers said the finalising of venue layouts and seating plans at Glasgow 2014 has allowed them to find the extra tickets.
Seats at all 17 sports and the opening and closing ceremonies will be sold on a first-come, first-served basis from 10am on Monday May 12.
Ticket prices start at £15 for adults and £7.50 for under-16s and over-60s.
May 12 will also be the day that tickets start to be delivered to those who were successful in the initial round of sales.
Glasgow 2014 chief executive David Grevemberg said: "This is another exciting moment for Glasgow 2014 as we give even more people the chance to be part of the Games.
"We have always said we want as many people as possible to have the opportunity to experience world-class sport and we are delighted to be able to offer these extra tickets for all sports and ceremonies.
"The demand for Glasgow 2014 tickets has been simply incredible and we can't wait to welcome the world to Glasgow and Scotland.
"Today's announcement helps us continue to build on our ambitions of making the Glasgow 2014 Commonwealth Games accessible, affordable and available to as many people as possible."
Commonwealth Games secretary Shona Robison said: "There has been unprecedented demand for tickets for the 20th Commonwealth Games.
"The final sprint for tickets means that even more people will get to experience the Games in Glasgow this summer.
"The affordability of the tickets has given many sports fans a once-in-a-lifetime chance to see some of the best sporting names from across the Commonwealth - we're looking forward to having them join us to celebrate what is shaping up to be the best Games ever."
Commonwealth Games Scotland chairman Michael Cavanagh believes the larger crowds will help the athletes to perform at their best.
"In 12 weeks' time, Team Scotland expects to have its largest and best-ever prepared group of athletes and staff, ready for the challenge of Glasgow 2014," he said.
"The athletes will go up against the best in the Commonwealth and seek to make their mark at the biggest international sporting event to come to these shores.
"We are all delighted that, through this extra release of tickets, the Scottish public has another opportunity to get behind Team Scotland and join everyone else who already has tickets in cheering our athletes to victory.
"The home crowd has a crucial role at Games time and the noise we know they can generate will help lift our athletes at that critical moment."
Tickets will be sold online at tickets.glasgow2014.com or via the Glasgow 2014 ticket hotline on 0844 826 2014. The hotline is open 24 hours a day.