What is S-Card?
From the Helsinki- Vantaa airport it is 21 kilometers to the hotel. Trains I and P go from the airport to Helsinki Central Station. With the same trains you can also return to the airport. From the Helsinki Central Station it is only 5 minutes' walk to the Original Sokos Hotel Presidentti.
Also the Finnair airport shuttle bus is working from the west side of the Railway station to the airport and back.
Time estimation for the journey is 40 minutes by bus and about 30-35 minutes by train or taxi.