[5][6] The players were initially mostly students from the local Castelli Archiepiscopal College, together with workers who took up sports in their spare time.The club's first activities consisted of playing friendly matches against other teams from the neighboring towns of Busto Arsizio, Legnano, Monza, Gallarate, Varese, Como and Milan.

[5][6] The club was reborn in 1940 under the name Società Calcistica Saronno, re-affiliating with the FIGC and enrolling at the lowest level of Lombardy's regional championships; in 1942 it reached Serie C, only to disband again in 1943.

The news, which came after the 1-0 home success achieved in the first leg of the play-off semifinal against Carpi, discouraged the Saronnese players, who lost the return match by 3-0, being ousted from the race to the second division.

The next championship was unlucky: Saronno finished in the relegation zone, finding itself in the play-out against Siena: the confrontation was settled in a double 0-0, which saved the Tuscans by virtue of the best position in the regular season.

), which won the Eccellenza national playoffs and was promoted to Serie D. In 2003, under the leadership of Giancarlo Ferrario, the club was refounded under the name of Associazione Sportiva Nuovo Saronno F.B.C., taking over from Manera Calcio the right to participate in the Promozione Lombardy championship.

[5] In 2006 the club finished 3rd in the Eccellenza championship, qualifying for the regional play-offs: after winning the semifinal against Verbano (1-0 first leg; 2-0 return), it lost the national final valid for Serie D by 1-0 in the match - played on the neutral field of Corbetta - against Corsico.

[10][11] Negotiations with the Saronno municipal administration (headed by Mayor Luciano Porro) for the concession of the name and the usufruct of the Colombo-Gianetti stadium, however, were unsuccessful,[12][13] eventually resulting in an exchange of accusations between the parties that precluded the possibility of reaching an agreement.

The president of the "new" Saronno became Antonio Pilato, assisted by general manager Giancarlo Balzaretti: Luca Petrone, back from a season in the youth academy of Caronnese, was chosen as coach of the first team.

[17] The presentation of the new club took place in the center of the city on July 23: on the occasion the jerseys were unveiled and the first players under contract were announced (among whom stood out the name of striker Michele Scavo, already in the team in the 2009-2010 season, who assumed the captain's armband).

This caused an initial lack of competitiveness, which resulted in immediate elimination from the Coppa Italia Dilettanti (losing both games in their group) and a poor debut in the league (seven defeats and many goals conceded in the first ten days).

In the following matches, however, the biancocelesti suffered numerous defeats and lost ground in the standings;[26] the departure of striker Davide Pizzini[27] and the health problems of president Antonio Pilato, who was forced to temporarily step aside between October 2016 and January 2017, made things more complicated.

[28] At the height of the crisis, between March and April 2017 Saronno sank into the play-out zone,[29] managing to get out of it and finally save itself directly only on the last day of the regular season.

[32] Mazza's management lasted only four days, resulting in one victory, two defeats and finally a 4-4 draw against Accademia Gaggiano (where the biancocelesti ended the first half ahead 4-1, only to suffer the opponents' comeback in the second half): thereafter the team had been entrusted ad interim to the athletic trainer Alessandro Artemi on the fifth day, on October 9 the coach Claudio Pilia was hired, back from his experience at Fenegrò (also in the Eccellenza Lombardy) and already at Saronno in the 2004-2005 season as assistant to Attilio Papis.

[33] The rotation, however, turned out to be fruitless: in the following eight days the biancocelesti collected only 4 more points (following as many draws); on November 29, Pilia was also relieved of his duties and replaced by Antonio Aiello (back from a brief experience at Avezzano).

[34] Already on February 6, 2018, however, the club (with the team still at the bottom of the standings) retraced its steps and recalled Pilia,[35] who, however, resigned at the end of the month after losing 0-6 to Union Villa Cassano, complaining of the impossibility of working at its best in the face of the numerous absences of registered players (replaced with players from the youth team) and of a club that, as admitted by president Pilato, found itself without supporters and in growing economic difficulties.

[36] In the following months, the situation continued to worsen: while on the one hand negotiations were underway to try to sell the club,[37] the team (lacking clear technical-managerial guidance and with increasingly reduced human and material resources)[38][39] racked up several defeats with many goals to spare and finally mathematically relegated to Promozione as early as April 6, losing 2-1 to Accademia Pavese of Sant'Alessio con Vialone.

Stability, however, proved ephemeral: finding itself short of resources again, the biancoceleste club lost its top players and ended up relegated to the Prima Categoria.

In the summer of 2019, the ownership of the club changed hands: in fact, Pilato sold Saronno to a group of individuals, some of whom were previously linked to Ardor Lazzate.

The season (prematurely interrupted by the outbreak of the COVID-19 pandemic) saw the biancocelesti stand at the top of their group, but without ever fully challenging the leader Lentatese: at the end of the championship, they finished in second place.

The following year, the pandemic also led to an early end to the season; in the summer of 2021, however, the club managed to return to Promozione through the merger by incorporation of ASD Gorla Maggiore.

The following year, the club reorganized with new president Francesco Paolo Gravina (later replaced by Giuseppe Giglio) and the addition of general manager Marco Proserpio and sports director Fabio Viganò.

After making use of various grounds (located in different parts of the city) in the first two decades of its existence, from 1931 to 2010 Saronno played its home matches at the Emilio Colombo-Gaetano Gianetti Stadium, a multi-sport facility with seating for approximately 4,000 spectators.

[54][55] The stadium, originally named Stadio del Littorio, after the fall of fascism was dedicated to journalist Emilio Colombo (editor of La Gazzetta dello Sport and Guerin Sportivo) and later also to the founder of the club, Gaetano Gianetti.

[72] Even during the club's period of inactivity, which lasted from 2010 to 2015, the Fronte Ribelle did not disband and continued to engage in extra-football activities, often socially inspired,[72][73] as well as lobbying for the refounding of the F.B.C.

[74] In September 2013, the group celebrated the 20th anniversary of its founding by parading through the streets of the city center in order to remark on the vitality of the ultras movement in spite of the absence of a representative team.