From the 10th January 2021, a private PCR test will be required before you fly to Cuba.

The information below has been taken from the FCO about travel to Cuba:

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Summary

Still current at:: 30 December 2020
Updated:: 30 December 2020
Latest update:: Updated information on PCR test requirements for everyone travelling to Cuba from 10 January 2021 (‘Summary’ and ‘Entry Requirements’ pages)

Travel to Cuba is subject to entry restrictions

From 10 January 2021, everyone travelling to Cuba must have a certified proof of a negative result of a PCR test taken within 72 hours before travel at an accredited testing centre in the UK or the country you are travelling from. Children are not exempt. You should not use the NHS testing services to get a test in order to facilitate your travel to another country. You should arrange to take a private test. You will still be given a PCR test on arrival in Cuba.
Jose Marti International Airport (Havana Airport) re-opened to commercial and charter flights on 15 November 2020. All other airports in Cuba are open for commercial and charter flights.
Everyone arriving into Cuba will have a PCR test on arrival.
Returning residents (Cuban and foreign nationals) have to self-isolate until they have a second PCR test with a negative result.
Tourists arriving on holiday charter flights will have a PCR test on arrival and will be transferred to their holiday resort.
Tourists staying in casas particulares should not leave the casa until they receive a negative PCR test result.

PCR Test Required before your holiday to Cuba