The Estonian Government Communications Office said anyone who has been vaccinated or had coronavirus in the last six months is exempt from the 10-day quarantine period.
Quarantine can be shortened with two negative tests, one taken no longer than 72 hours before departure and the second no earlier than six days after the first.
If the trip is for work, study or a family event the traveler can return home before the end of the quarantine period.
Previously, travelers from the three countries including Latvia were not required to quarantine if they presented a negative test on arrival.
However in the border town of Valga-Valka, the current regulation remains valid for movement between cities. The Estonian government plans to adopt the corresponding order this Thursday.