Tara Hanlon pleaded guilty to three counts of offenses relating to cash payments of £1.4 million on July 14, £1.1 million on August 10 and £1 million on August 31, 2020.
She pleaded guilty at Isleworth Crown Court in June, pleading to have committed money laundering in amounts worth more than £5m.
Tara had previously claimed that her life was a "perfect life"; because of its function.
Border officials said the amount was the largest cash seizure from a person at Britain's border in 2020.
A customs official stopped Hanlon at the airport while she was traveling with a friend to Dubai. When he asked her about the purpose of the visit and her luggage, she said that she was going on a "women's flight", and that she had five bags; Because she "wasn't sure what to wear" while she was there.
The money was in vacuum packets, hidden under some packets of coffee, apparently in an attempt to hide the smell of the shipment from the sniffer dogs.
Hanlon said this was her first flight, that she had not been paid, and that she thought it was legal; The money will be announced in Dubai.
By investigating the airline and searching on her phone, it was found that she had made three previous visits as a parcel deliverer in July and August 2020, and that she had paid about £3,000 per flight.
She texted her phone, bragging about saying goodbye to her debts after three big trips.
In other letters, she referred to her work as providing her with "a perfect life, a few days in the sun, and a few days at home".
The National Crime Agency discovered that Hanlon had declared she had over £1m in cash on arrival on each occasion, totaling £3.5m.
Stephen Gratge, her attorney, claimed that Hanlon was going through a period of temptation to commit crimes, the period following her mother's untimely death in March, and after she left her job shortly thereafter; due to the covid epidemic.
But Judge Karen Holt, who handed down Tara Hanlon's 34-month prison sentence, said: "Although you were in danger at the time, I don't find that you were exploited, you know what you were doing."
In a related context, the security authorities at Shah Jalal International Airport, in Dhaka (the capital of Bangladesh), arrested a Bangladeshi passenger, accused of attempting to smuggle foreign currency.
The Bangladeshi newspaper, "bdnews24", said that the accused, Jahangir Ghazi (36 years), was arrested in possession of one million and 100 thousand Saudi riyals, in addition to other currencies that he had hidden by wrapping them around his body.
The newspaper pointed out that the accused was on his way to Istanbul via a Turkish Airlines flight, before an officer suspected him and asked to be stopped and searched, and the accused was unable to present any legal document allowing him to carry the coins.
The report added that the accused is taking advantage of his profession as a commercial figure who works in the cloth trade, in smuggling currency, and it is clear from his passport that he left outside Bangladesh in the last period 128 times; Despite the restrictions and strict measures around the world due to the Corona pandemic.