I was just browsing potential one way flights for myself and my partner again but when I had searched before, it seemed that it was cheaper to buy a return then a one way for some reason but this time I found a new tool on skyscanner.net. It isn't available on their app yet but it is on their mobile website. In the departure date section it has the option to chose the cheapest month. So type in your departure and destination locations, chose the cheapest month feature then boom, this then brings up the cheapest prices for the individual days in the selected month so as long as your mildly flexible, you can pick up a right bargain. For instance I'm looking at making the move over next May and I found a one way flight with Malaysia Airlines for £383pp, when the cheapest that I had previously seen was over £650!! Unreal! Just thought I'd share this as this looks like a real money saving way of booking a one way flight!