Assuming you're American as Americans always think the whole internet just consists of fellow Americans... Try Kayak.com for flights, leaving the dates flexible in the search as prices vary by the day or even the hour you search. There is no "cheap" time with hotels in Paris or London, but there is an off season, usually in autumn/winter. Good luck and have fun.
We're not mind readers dear. Where from? It does make a difference you know.
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Just another senseless question!
FROM WHERE?
Yahoo!Answer is accessible all over the earth, more details please for sensible answers!
http://www.expedia.com
