Tallinn Airport handles all flights in one terminal with a central check-in hall for all destinations.
It is one of the smaller and very clear airports. From the entrance to the terminal to the exit, it takes no more than 10 minutes to walk to the aircraft.
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A single security checkpoint in the middle of the concourse takes you to a single transit area.
Departure gates 1-10 handle flights to Schengen area countries. This is followed by passport control and departure gates 11-18 for flights outside the Schengen area.
Transfer between flights
Tallinn is not a major connecting airport, however, with the growing AirBaltic airline, you can sometimes connect in Tallinn when travelling from Finland or Latvia.
The transfer is very well organised and you don't have to leave the transit zone at all during the transfer, even if you combine the transfer on your own by buying 2 separate tickets (if you are travelling with hand luggage only).
There is no security or passport control on flights between Schengen countries. In this case, the real transfer time is about 5-10 minutes.
When transferring from a Schengen to a non-Schengen flight, you only go through passport control, otherwise you also go through security. However, there are never queues longer than 10 minutes at these checks.