To Thessaloniki
Fly to Thessaloniki Airport Makedonia SKG – https://www.skg-airport.gr/en
From the Airport you can reach the center of the city with the buses 01X and 01N. In every 30 minutes rhythm they drive to and from the city center. Its costs 2€ and you can buy your ticket in the bus.
Alternatively you can take a taxi, which is approx. 20€ to the center of Thessaloniki.
To Armenistis
You can use the Urban buses called KTEL Chalkidikis from Thessaloniki to Armenistis or from Thessaloniki to Sarti and then a taxi from there. But take into consideration that during that period the Ktel buses do not run frequently.
Other Option is to hire a mini bus or a taxi, you can also share the route with people.
Also you can contact Teasin the Bay maybe we can organize mini vans if we are more people traveling the same time approx. This would be charged separately.
If you need assistance and more help on that send an email to info@teasinthebay.com.