Mmm, my first look in international travels, and I cant believe my eyes.... Certainly I will return to Spain once or twice a year. Don't know the dates, and I was expected to find cheaper flights if i book together the two ways... But not so much difference!!

Best travel found: British Airways : LCG-HTR-SIN (13-14 Feb) returning a random day in June: 1000 €. If I take one-way 3500!! How is it possible???

I remember a travel to Torino this year. With Air France I booked Vigo-Paris-Torino and return by less than 300 €. Going only to Paris, in the same flight, and return from Paris to Vigo in the same flight was over 550 €

So I will try to be sure of my free days with company before travelling, and if not, taking for a random day with cheap fare, however I break the travel ticket when Im in Singapore

Qantas has the effect I expected for. Returning a random day is around 650 SP, and going one-way is around 573 SP. Ok, it's better to take round trip, but not cheaper for one-way travel!!. It's a similar price to BA, and I must add the travel to London.

So British Airways is my first priority.

Thanks everybody for helping this novice, and I will help any more info.

Thanks!!