My condolence and prayers for your family Allyn.
My advise for you is get a cheaper flight. There's cheap flights offered by KLM. It cost 447£ for a period of 1 month. (Edinburgh/Glasgow/NewC- Manila). PIK-UK is offering 460£ Return.
I think if you will make a loan of 700£, it may not be a big burden to you. At least you can pay last respect to your dad and see the whole family.
I know how you have been supported your ill dad before, and this is the last thing you can do for him. But the choice is yours Allyn.
Be strong! miss you