Border Force officers arrested the man after they discovered bags containing about £100,000 worth of the Class A drug had been sewn into the lining of a suit carrier.
Bastien Corris Steve Dember, 24, from Union Island in St Vincent and The Grenadines was arrested after he arrived at Gatwick on a flight from St Lucia on August 8.
Dember appeared at Croydon Magistrates Court on August 9 and pleaded guilty to a charge of importing Class A drugs and was remanded in custody until September 12 when he will be sentenced at Croydon Crown Court.
Border Force South regional director, Sue Young, said: “Border Force officers play a crucial role in securing our borders against drug smuggling. In this case, their professionalism has meant that dangerous Class A drugs have been seized and will no longer end up in our communities where they can do so much harm.