VlaznimA Hello BrendanT If you buy the Swiss Travel Pass Flex for 4 days within a month, you can travel on these days you mentioned. This pass is always from 3 up to 15 days within a month available. During the month of validity you can choose which days you want to travel. More infos on Swiss Travel Pass – the All-in-one-Ticket for Switzerland | SBB. Greetings, VlaznimA.