Pattaya Utd

The club was founded at the end of the 2018 season after Tanet Phanichewa, owner of Pattaya United, decided to rename the club to Samut Prakan City and relocate it to Samut Prakan Province. In their first season, the club competed in the 2019 Thai League 1.

Prior to the 2019 season, The club appointed Tetsuya Murayama as the club first Director of football, the work of Tetsuya Murayama in coordination with Coach Surapong Kongthep in the first season of the club in Thai league 1, the club performed quite well and finished in 6th place.

The club appointed Masatada Ishii as manager ahead of the 2020–21 Thai League 1 season by releasing Ibson Melo, Kim Pyung-rae, Baworn Tapla, Phumin Kaewta and Woranat Thongkruea. The club signing Tatsuya Sakai from Montedio Yamagata, Yuto Ono from FC Gifu and Brazilian striker Pedro Júnior.

The 2020–21 Thai League 1 season began with 1–1 draw against Chiangrai United on 14 February 2020, followed up by three match lose. The first win in the league came at the 5th matchday, winning 1–0 against Rayong at the Samut Prakarn SAT Stadium on 13 September 2020. After the 10th matchday, the club stood at 12th place in the league.

After a series of disappointing results, The club has won 3 match in a row, winning 1–3 against Buriram United at the Chang Arena, winning Chonburi and Trat and the club climbed to 6th place after the first half of the season (Round 15). The success compared to a relatively smaller team size than the other teams in the league, however, was followed by a win against one of the wealthiest club in the Thai League Port 6–3 on 27 December 2020.

Samut Prakan City advanced to the third round of the Thai FA Cup, being eliminated after losing 1–0 to Muangthong United at the SCG Stadium on 3 February 2021.

In January 2025, The Football Association of Thailand has punished Samut Prakan City by banning them from the league and fining them 2 million baht. This is due to the team failing to register players and refusing to play in the second leg of the season. The association cited the team's lack of communication and failure to comply with FIFA regulations.