If the flight was purchased from a Philippines company then it is likely to include the travel tax. If it wasn't then for a economy ticket the cost of the travel tax is 1620 php.
Will definately need to pay the terminal fee at the airport, assuming the flight is from manila it's 750 php (someone reckons they also paid an extra 15 php recently).
It's possible to fly immediately after you get your CFO stamp, though you are not allowing much time for any problems (ie seminar being full, being held up in traffic and not getting there, etc)