The Singapore SEA Games Organising Committee (SINGSOC) was formed on 28 June 2012 to oversee the staging of the event.

Given the city-state's compact size, most venues were pre-existing public-sporting facilities located in the suburban heartlands which were reverted to public use after the games.

Besides being physically near to the Singapore Sports Hub, it was hoped that it will add vibe to the city and reduce post-games costs in converting a dedicated games village to other uses.

Given the existing extensive public transport network already in place, there is no games-specific major infrastructural development to support it.

The clustering of venues is aimed at easing the traffic flow, charted bus and MRT services for athletes and officials were provided.

[10] A total of about 790,000 tickets were put on online sale from February 2015, at the Singapore Indoor Stadium and at SingPost outlets.

To encourage public participation in the games, it was announced on 28 January 2015 that 18 of the sports will be free for spectators, while the other 18 are kept at relatively affordable levels of between S$5 to S$20.

Billiards and snooker, equestrian, sepak takraw, taekwondo, and artistic gymnastics have sold about half their tickets.

[15] During the closing ceremony of the 2013 Southeast Asian Games, the SEAG Flag was formally handed over from Myanmar to Singapore.

On 27 June 2014, a series of festivities were held at the Singapore Sports Hub, including a fireworks display, to mark the one year countdown to the games.

[16] The countdown to the games began on 15 February 2014 with a launch party at the Gardens by the Bay, where the logo, theme and mascot were also introduced.

It was also announced during the media brief, that smaller versions of the medal, in the form of medallions, will be given to all spectators of the closing ceremony.

[24] The torch relay took place on 4 June 2015, the eve of the games' opening ceremony began with the torch lit at the Marina Bay Promontory, and went past Clifford Square, Merlion Park, Esplanade Plaza, the Art Science Museum and end at Marina Bay Sands, where the flame handover ceremony to the Games officials took place.

It was chosen to represent the connection of individuals, communities and countries to their own dreams beyond competing, winning or overcoming defeat and the inspiration of the soul and spirit inside each people of Southeast Asia.

[29] A special compilation album titled Songs of the Games was produced by veteran music director Sydney Tan and released on 3 March 2015.

The Games had its closing ceremony held on Tuesday, 16 June 2015, from 20:00 SST (UTC+8) at the National Stadium in Singapore.

Tan Chuan-Jin then delivered a closing speech, in which he includes an emotional quote, paying tribute to all victims of the 2015 Sabah earthquake in which many Singaporean primary school students from Tanjong Katong Primary School died and all the national flags of the participating nations and the games flags been flown at half-mast on 8 June 2015 during the games.

A Singapore farewell segment performance is later performed with a parade of colonial era, people, symbols, uniform groups, landmarks, government policy and 1993 Southeast Asian Games stamps and objects such as Chinese Junk and Sail boat and the Singapore Airlines Airbus A380 aircraft, brought back the nation's historical memory in the past 60 years.

The ceremony concludes with a party with music spun by Dutch DJ Ferry Corsten,[36] a performance by local fusion Jazz group The Steve McQueens and a bunch of fireworks erupted over the stadium again and for the last time.

[38] An estimated total of 4490 athletes (about 2610 men, 1880 women) from 11 nations competed at the 2015 Southeast Asian Games.

The first 30 sports were announced by the Singapore National Olympic Council on 10 December 2013 on the sidelines of the 27th SEA Games in Myanmar.

[39][40] On 29 April 2014, the final six sports, namely boxing, equestrian, floorball, petanque, rowing, and volleyball were added to the programme.

An additional gold medal was awarded as there was first-place tie in the Rhythmic Gymnastics individual all-around event.