Or a train would be £11.00 single ticket from Wolverhampton to London Euston with Virgin trains and From St Pancrass to Paris on Eurostar is as cheap as £44.00 so £55.00 all in and you get direct in to center of paris with the plane you would have travel costs getting from paris airport to the center of paris.

But to get the fares listed above you need to book well in advance.

I would go for the train but if you like flying go for that

As you can see on the map
http://www.multimap.com/maps/#t=l&map=49.01278,2.55|11|4&loc=FR:49.01278:2.55:14|Charles%20de%20Gaulle%20Airport|A%C3%A9roport%20de%20Paris%20-%20Roissy%20Charles%20de%20Gaulle%20(Paris%20-%20Charles%20de%20Gaulle),%20%C3%8Ele-de-France,%20D%C3%A9partement%20du%20Val-d’Oise

Paris Charles de Gaulle Ariport is quite a way out of Paris the Eurostar would get you right into the centre of Paris and might be cheaper if you add the coat of a taxi bus or train from Paris airport to the centre of paris which is about 10 Miles.