I will arrive Paris on Sat.18 May in the next week and stay for 5 days until Wed. 22 May.
Can i buy weekly Navigo pass before on Sat. 18 May and use it later on Mon.20 May?
If I visit Foutainbeau and Verseille Palaces on Sun. 19 & Mon.20 May , which kind of ticket should I buy if i can't use Navigo Pass on these days?
Thank you so much for your kind support.
Yes, you can buy Navigo card on Saturday (May 18) and it will only start to be valid for travel on Monday May 20. (It will not be useful on May 18-19.) Navigo week pass is good for Paris - Fontainebleau by train (Transilien) and Paris - Versailles by train (both RER & Transilien trains).