If you fly into Beauvais Airport, what's the easiest and least expensive ... well, maybe those would not be the same ... so rather what's the "best" way to get from the airport into the city? Cost, time spent, etc?

google bus beauvais paris

Buses leave 20 minutes after each flight arrives, cost 13 euro OW, drop you at Porte Maillot where you can pick up Metro, RER or a cab. http://tinyurl.com/d3p7s

Thanks for the info - I did google it and found the Ryan Air bus we will need to take.

And if you're leaving from Beauvais also, be sure to book a return bus ticket, and take a taxi to Porte Maillot - if you take the metro it can be very confusing trying to find the place where the bus leaves from. We very nearly missed our bus and therefore our flight because we took a wrong exit from the metro and got totally lost!