Flight search engine for specific date for outbound flight and undefined date for return flight?

Question

On a specific date, I have to fly from A to B. Using various flight search engines, it turned out that the cheapest possibility is to buy a return ticket. Now the problem is, the search engines I know do not allow to search for the cheapest flight with a the first flight on a specific date and the second flight on a random (the cheapest) day. I want to do this, because I won't use the second flighty anyway. So is there any search engines that allows me to search flights like that?

Answer 1

Skyscanner

Just choose the Whole Month as departure and arrival date. You will be presented with a graphic in which you can pick the departure date, the arrival calendar will update accordingly.