Avoid endless queues at the ticket booth on match days! Get your train ticket from Paris to the Stade de FranceM from any Paris Metro/RER station within zone 1 in advance. The Stade de France is on the RER line B direct from Gare du Nord and is in zone 2.
Buy two tickets for a return.
Please note: If you decide to physically leave the underground system during your journey, your ticket will no longer be valid.