[13] It is owned by former India captain Bhaichung Bhutia,[14] and was founded in order to give people of the Indian state of Sikkim a professional football team.

[2] On 22 March 2011, the club was launched as a professional, which would be co-owned by Dubai-based Fidelis World,[24] former India football captain Bhaichung Bhutia and Indian singer Shankar Mahadevan.

[15][27] The club started their quest for the I-League on 27 February 2011,[28] when they signed Liberian international Johnny Menyongar from NSC Minnesota Stars of the North American Soccer League in the United States.

[30] United Sikkim won their first match of the season five days later, on 5 April 2011 against North Imphal Sporting Association at the Indira Gandhi Athletic Stadium in Assam, by a score of 2–0.

[32] The club began Final round with three consecutive draws against Sporting Clube de Goa, Royal Wahingdoh and Shillong Lajong, before winning two matches in a row against Mohammedan and Southern Samity.

Next, a draw to Ar-Hima and a loss to Vasco officially knocked United Sikkim out of contention for promotion and forced them to settle on fifth place for the season.

On 11 June 2011, it was announced that Johnny Menyongar would leave the club to join I-League team Shillong Lajong, as well as Indian internationals Renedy Singh and NS Manju few months later.

[39] They won promotion on the last day of the season on 17 April 2012 at the Paljor Stadium in front of 30,000 fans, as United Sikkim drew Mohammedan 1–1, with Daniel Bedemi scoring.

[42] Later it was initially reported that United Sikkim had started talks with Australian manager Nathan Hall about a possible head coaching role at the club.

[43] On 10 December 2012, it was officially confirmed by United Sikkim that Hall had joined the club as its new head coach, replacing interim player-coach Bhaichung Bhutia.

[55][56] On 18 December 2014, it was revealed by owner Bhaichung Bhutia that United Sikkim had decided to leave the competition as future of the I-League was dim due to the formation of ISL, and thus team would only participate in the local league.

The players will be scouted from different parts of the regionIn 2021, Bhaichung Bhutia, the owner of the club announced that it will revive its junior and senior teams while aiming to bring the Indian Super League (ISL) into the state, alongside focusing on its grassroots.

[91][92][93] United Sikkim had a rivalry with their fellow North East Indian club Shillong Lajong in the I-League, which was often regarded as the "Northeast India Derby".

[139] In 2013, Snow Lion Cup for under-14 kids was incorporated, and coaching camps with grassroot framework in hilly areas of Sikkim, Kalimpong and Darjeeling were set up by the club, with partnership of State Bank of India and Bhaichung Bhutia Football Schools.