Buying Air Tickets for my Indonesian Maid

My maid just asked if I could get tickets for her to fly back from Padang, Indonesia instead. Previously, it's a round trip from Yoyakarta.

So now, I'll be getting:
- a one-way ticket from Singapore to Yoyakarta and
- another one-way ticket from Padang to Singapore

AirAsia offers one-way tickets to Yogyakarta. Their tickets are more expensive on Saturday and Sunday.