In 2011, the team became the Western New York Flash and joined Women's Professional Soccer (WPS), its only season in the league.

The Flash reached the inaugural NWSL Championship during the 2013 season, but fell to the Portland Thorns FC while searching for their fourth straight title.

[3] While the professional team was replaced in the NWSL by the North Carolina Courage and folded following two seasons in the United Women's Soccer League, the franchise remains through a youth academy player development program.

[4][5] In 2009, the Buffalo Flash made its debut in the Great Lakes (formerly Northern) Division of the USL W-League's Central Conference, lining up against teams from Hamilton, Laval, London, Ottawa, Quebec City, Rochester and Toronto.

It finished second, with a regular season record of 9–2–3 from their 14 matches, undefeated in their seven games on the road, and with 40 goals scored, and 10 conceded.

In the post-season playoffs, the Flash reached the Central Conference semi-final, to end their inaugural season with a 10–3–3 record.

[6] Before the 2010 season Buffalo Flash signed English trio Gemma Davison, Eartha Pond and Ann-Marie Heatherson.

[8] Kimberly Brandão returned despite attending a training camp with Sky Blue FC, but Erika Sutton left for the Boston Breakers[9] and Sarah Wagenfuhr joined St. Louis Athletica.

[10] In 2010 Buffalo Flash competed in the Midwest Division of the USL W-League, finishing the regular season 14–0–2 against Chicago Red Eleven, Cleveland Internationals, Kalamazoo Outrage and London Gryphons.

[11] Buffalo Flash won the W-League Championship by defeating the Vancouver Whitecaps 3–1 at Harry Welch Stadium in Santa Clarita, California.

[21] The team shutout Sky Blue 2–0 in the opening game, earning the right to host the Thorns in the 2013 NWSL Championship at Sahlen's Stadium in Rochester.

The low finishes for the team in the past two seasons caused for quite a few cases of transition, most notably with long time head coach Aaran Lines who was eventually replaced by Paul Riley.

[28] On March 7, 2017, the Flash announced that they would join the United Women's Soccer for their upcoming season, with the team playing matches in Buffalo for the first time since 2010.

The stadium's highest attendance record was set on July 20, 2011, at 15,404 during a match between the Flash and magicJack (led by player-coach and Rochester native, Abby Wambach) after the 2011 FIFA Women's World Cup.