Its been slong time simce iv been there but I would imagine you could, depends what airport your going from.
Orly and charles de gaulle (sp?) are fairly close and the metro should only take less then half an hour and the run very puntual.
The eiffal tower is about 15 min walk from the train station (warning do not stop for anyone that offers to draw your picture, we got conned for 60 when we refused 5 of their mates suddenly came out from behind a bush).
The routes on the metro can be a little confusing if your not used to it so a taxi might be easier again shouldnt take to long.