Flying into Chisinau Airport is typically the best way to visit Kishinev Cathedral, since it is the closest airport to the area.
If you are looking to fly to Moldova for less, look to airlines like Wizz Air, TAROM, and LOT, with prices starting at $49, $77, and $85 respectively.
Moldova has restricted the entry of most travelers except for nationals and residents of Moldova. As of June 30, other categories of people are allowed to enter Moldova. These include: people with a business visit visa, long-stay visa, residence permit or equivalent document, members and dependents of diplomatic missions, consular Posts and international organizations accredited in Moldova, personnel providing humanitarian aid, passengers in transit, people traveling for health and humanitarian reasons, cross-border workers, and drivers and service personnel, for the purpose of transportation of goods (aircraft, ship and train crew). If you are planning to travel to Moldova at this time, it is recommended that you stay up to date on current restrictions and follow proper safety measures while in public.