Originally Posted by remymartin

Instead of going towards the security, turn left, pass the kiosk and enter the original terminal with wooden floors and a rather low ceiling. This is where TK/DY/JL etc check-in stands are located. Continue to the end of the corridor and there you'll have the second security.

When heading to the non-Schengen section you'll also save a massive amount of time as the second security is a lot closer to passport control.

Originally Posted by OldHigsonian

Its at the hotel end of the building, you would have walked past it twice, once as you walked from the hotel to the main terminal and then airside as you walked from security to gate 30 something.

Originally Posted by db7

The main checkin area at HEL T2 was built between the domestic terminal now T1 and the old Terminal (approx. gates 26 -30). So if you turn left after entering the building from the bus stops you pass a shop and cafe and arrive at the Flybe and charter checkin desks. These are in the old terminal. Beyond them is another security area, this is seldom busy unless a charter is leaving. It brings you out near passport control and saves you having to negotiate the narrow corridor caused by the shops in the old terminal.