The band will now play a third date at London's Emirates Stadium on June 4 and a second at Manchester's Etihad Stadium on June 10 after experiencing high demand.
Tickets for their initial run of five stadium dates in London, Sunderland, Manchester and Coventry went on sale at 9.00am today (November 18).
The shows will be in support of their recent chart-topping album Mylo Xyloto, which was released last month.
The group will play a handful of UK and European arena dates next month and will be supported by Emeli Sandé and Marina & the Diamonds.
Coldplay have also announced plans to play a free, intimate gig at London's Dingwalls venue as part of a BBC Radio 2 In Concert show to be broadcast on December 15.
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Watch the music video for Coldplay's single 'Paradise' below: