Sorry if this type of question have been answered before.
I will be arriving in Helsinki Airport around 23:35pm and will take bus 620 or 615 to Sörnäinen. From the HSL website, it stated that I can purchase day ticket from numbers of convenience store. But I quite confuse when it comes to 'single-charge card'.
Can someone help me to figure out how do I buy day ticket from airport at those hours? Can I buy from the machine or driver? Do I need 'single-charge card' beforehand? What is the validity of the card e.g I buy the 3 day ticket? Does the cost of Suomenlinna ferry included on this type of ticket? I plan to buy 3 days regional ticket...
Thanks in advance!
p/s I might ask other questions next time, so I put very subjective 'subject'