Is my Métro ticket included if I’m changing stations in Paris?
Métro journeys will not be included on your ticket, but you can buy Parisian Métro or RER (suburban trains) tickets in packs of 10, called carnets onboard Eurostar trains.
You can also get them at ticket desks or self service ticket machines in all Métro/RER stations, like Gare du Nord.
If you're making a return journey, you can buy your return tickets at the same time, since Métro and RER tickets can be used on any day.
Make sure you keep hold of your Métro tickets - you might need them to exit the station when you arrive.