The ousting of Flavel is one of the first actions taken by NatWest's interim CEO Paul Thwaite, after the group's former CEO Alison Rose quit on Wednesday over the same matter.
NatWest has faced intense scrutiny over the decision by Coutts to sever ties with Farage.
An internal review obtained by the politician-turned-TV show host showed Coutts' wealth reputational risk committee had said his values did not align with the bank's own.
Australian-born Flavel, who previously served as CEO of JPMorgan Private Wealth Management in Asia Pacific region, took the top job at Coutts in 2016.
Mohammad Kamal Syed will step into the role of interim CEO of Coutts and NatWest's wealth businesses, Thwaite said, adding that Flavel was stepping down by "mutual consent".
Persons:
Coutts, Peter Flavel, Nigel Farage's, Flavel, Paul Thwaite, Alison Rose, Rose, she'd, Farage, Howard Davies, Charles Dickens, Queen Elizabeth II, Mohammad Kamal Syed, Thwaite, Iain Withers, Sinead Cruise, Lawrence White
Organizations:
NatWest, BBC, Reuters, JPMorgan Private Wealth Management, Thomson
Locations:
Asia Pacific