5J (cebu Pacific ) is he cheapest one! It is the low cost airline, always delay and no compensation, if you want to change your ticket, you need to go to TST in person, very time consuming! If nothing change on your schedule, worth to try!
I bought a ticket via cebu Pacific for my maid last month. It's cheap. I just do it online so it is very convenient (no need to do it via travel agent).