On 26 August 2013, Halcyon was reissued as an expanded version titled Halcyon Days. The lead single from the reissued album, "Burn", was released 5 July 2013. The song topped the UK Singles Chart, becoming Goulding's first number-one single on the chart.
In 2010, Goulding participated in the Bupa Great North Run for the British Heart Foundation. In 2011, Goulding ran the She Runs LA event for charity Students Run LA. In 2012, she partnered with Pandora Radio. On 1 June 2013, Goulding performed at Gucci's global concert event.