One way flight from Dalaman?

Hi folks,
had got our holiday for end of May all sorted, flying back on Saturday the 30th May and then Everton have to go and get a place in the Cup Final! We are due to fly back on the Sat at 4.15 not getting into Gatwick until 6 ish. and I don't think my other half could cope not knowing the score until we land. Does anyone know if its realtively easy to book a one way flight on, say, the Sunday (31st May) or Monday (1st June) from Dalaman to Gatwick when in Icmeler or is it best to do it beforehand. Thanks.
had got our holiday for end of May all sorted, flying back on Saturday the 30th May and then Everton have to go and get a place in the Cup Final! We are due to fly back on the Sat at 4.15 not getting into Gatwick until 6 ish. and I don't think my other half could cope not knowing the score until we land. Does anyone know if its realtively easy to book a one way flight on, say, the Sunday (31st May) or Monday (1st June) from Dalaman to Gatwick when in Icmeler or is it best to do it beforehand. Thanks.