What would happen if my passport expires on Sept. 24, 2019, and I'll?
If you try to fly in August 2019 with a passport that expires in Sept 2019, the airline may refuse to allow you to board, and/or the Philippines entry port may deny you entry into the Philippines. I would send for a renewed passport NOW, and if you have any Visas you need in your existing passport, carry that along with the new one. I would consult the countries you have visas for to make sure thats OK with them before doing so.