Most of you will be travelling by Eurostar, so this doesn't really arise. Otherwise RER from Roissy/Charles de Gaulle, Orlyval plus RER from Orly. Cheap, fast, reliable (except on strike days). A taxi will set you back €30-40 depending on the time of day. Above all, NEVER take a taxi to return to the airport; the least traffic jam on the Paris ring road and you'll miss your plane.

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