When visiting Republic Square in Yerevan, the closest airport is Yerevan Airport.
The cheapest flights to Armenia recently found by momondo users are £24 with Ryanair, £51 with Ukraine International Airlines, and £53 with SkyUp.
Armenia has restricted entry to all travelers until at least May 14, 2020. Armenian nationals and residents and their immediate family members, diplomats and their immediate family members, and airline crew may still enter Armenia. All incoming travelers are subject to a 14-day quarantine. If you are planning to travel to Armenia at this time, it is recommended that you stay up to date on current restrictions and follow proper safety measures while in public.