She qualified for the finals with 6 wins, including an impressive score of 101 in her first game. In her 7th game, she came across Mike Lambert in top form, as he won with 107, one of the highest debut scores of the series. She qualified for the finals as #5 seed where she faced 11 year old Kai Laddiman. Flack held the higher seed to a crucial conundrum, but neither player could solve the conundrum LASERDISC and Flack lost by 9 points.
She returned for the Championship of Champions XIII, facing Steven Briers in the first round. Briers scored in every round, including the nine ANTIPODES in the first round, the first nine-letter word of the competition. His outstanding performance meant he beat Flack by 47 points.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|4659||2/09/2008||P||Tom White||61 – 101||Debbi Flack||Graham Cole||Susie Dent||132|
|4660||3/09/2008||P||Debbi Flack||92 – 68||Peter O'Hare||Graham Cole||Susie Dent||119|
|4661||4/09/2008||P||Debbi Flack||84 – 64||Alastair Wilkin||Graham Cole||Susie Dent||137|
|4662||5/09/2008||P||Debbi Flack||74 – 72||Declan Lyons||Anton du Beke||Susie Dent||115|
|4663||8/09/2008||P||Debbi Flack||97 – 64||Alasdair Duguid||Anton du Beke||Susie Dent||127|
|4664||9/09/2008||P||Debbi Flack||77 – 50||Kay Landsburgh||Anton du Beke||Susie Dent||120|
|4665||10/09/2008||P||Debbi Flack||75 – 107||Mike Lambert||Anton du Beke||Susie Dent||140|
|4729||9/12/2008||QF||Kai Laddiman||82 – 73||Debbi Flack||Jo Brand||Susie Dent||132|
|4740||21/01/2009||CP||Steve Briers||121 – 74||Debbi Flack||Alastair Stewart||Susie Dent||126|
|S31||25/07/2011||S||Claudia Tyson||85 – 79||Debbi Flack||Penny Smith||Susie Dent||121|