If you are looking to fly to Latvia for less, look to airlines like Wizz Air, airBaltic, and Ryanair, with prices starting at $29, $30, and $30 respectively.
Latvia has restricted the entry of all travelers except for Latvian, Estonian, and Lithuanian nationals and permanent residents. Nationals and residents of EEA Member States and the UK may enter the country if they are traveling from within the EEA or the UK. Spouses or minor children of Latvian nationals, members of government delegations and passengers in transit may still enter Latvia. From 17 September the period of self-isolation is reduced from 14 days to 10 for asymptomatic travelers. Travelers who have been in contact with a COVID-19 infected person or who work in Latvia in the medical professions, as teachers, or as social workers are still required to self-isolate for 14 days. The Government of Latvia is monitoring the rates of COVID-19 in these countries and travelers arriving from countries with more than 15 cases per 100,000 inhabitants will be required to self-isolate for 10-14 days upon arrival. Up to date information can be found on the Government of Latvia website. Currently, residents of the following countries are also permitted to enter Latvia: Australia, Canada, Georgia, Japan, New Zealand, Rwanda, South Korea, Thailand, Tunisia, and Uruguay. This list is updated every two weeks by the EU and can be found here. Starting from July 16, all travelers are required on arrival to complete a contact form for contact tracing listing the address they will be staying upon arrival. If you are planning to travel to Latvia at this time, it is recommended that you stay up to date on current restrictions and follow proper safety measures while in public.