Find cheap flights with timeconstrains like any week-end [duplicate]

I want to do certain trips when I can get it cheaply, for example cheap flight Friday evening and the following Sunday evening. (So not a particular week-end but the cheapest week-end in a period of a few months)

How can I search for this, and keep monitoring for for example the next 2 months?

This is typically between 2 European countries, sometimes with inland connections on one side. Sometimes the return is from a slightly different airport.

Sometimes (like when I want to leave from work) I typically want a god combination of cheapness/directness in a time-period.

Other-times, like Sunday evening return i want a good combination of lateness, cheapness and directness.

Any help to formulate this better is appreciated.

(Airports flexibility is not important, so proposed duplicate is not a duplicate at all).

If this cant be done directly, I might want to bookmark searches. Then bookmarking should be possible, and it should be easy to create a new search from another one.