Faifai Loa returned to New Zealand before signing a contract with the St. George Illawarra Dragons starting in 2009.[2][3] As a 20-year-old, Faifai Loa scored 12 tries and broke near 100 tackles throughout the 2009 Toyota Cup season. In 2010 he averaged over 200 metres a game and scored 11 tries in 13 appearances. Altogether, he scored 29 tries in 45 games[4] and being named in the 2010 National Youth Competition Team of the Year.[5] In Round 11 of the 2010 NRL season he made his NRL debut for St. George Illawarra against the Canberra Raiders. In his second NRL game, Faifai Loa scored 2 tries. At the end of 2010, it appeared that salary cap demands would force him out of the St. George club.[6] Faifai Loa is cousins with fellow New Zealand international Jeremy Smith.[7] Faifai Loa lived with Smith when they were playing for the St. George Illawarra Dragons.
After the 2011 season, Faifai Loa was selected to make his international debut for New Zealand in the test match against Australia at Ausgrid Stadium.[11] He was then selected in the New Zealand squad for the 2011 Four Nations tournament, scoring his first international try in the tournament's opening match against Australia.[12]
In December 2011, Faifai Loa re-signed with the North Queensland club for two years.[13]
In October 2017, Faifai Loa signed with Intrust Super Cup side, the Townsville Blackhawks for the 2018 season.[16] In his first season with the 'Hawks he would score 70 season points from 16 tries and 8 goals.
2019 Season
In his 2019 Faifai would make 25 appearances. He scored 13 and made 8 conversions for a season tally of 68 points. Out of the 25 games he played for the 2 games for the finals appearance the Blackhawks made. But ultimately coming short to the grand final from in their 14- 26 loss to the Wynnum Manly Seagulls.
2020 Season
Due to the Covid-19 outbreak the Intrust Super Cup was cancelled just before round 1. Therefore Kalifa took up club rugby in TDRU (Townsville and District Rugby Union) and played for Western Suburbs.
2021 Season
In 2021 Kalifa played 16 games for the 'Hawks scoring 12 tries and only having 1 conversion making his season points 50. He played in the Blackhawks one only finals game appearance against Souths Logan Magpies scoring a try but losing the game 30-24