I did the same thing... But i took the airport bus. Cost 20peso person. It need to go one big circle around... To T1. The location to the bus stop is not very clear. If u ask me to do find it again. I may not be able to do it again
Maybe by cab is faster? But traffic is going to be a little jam up because of the timing. We still made it.
The main thing to remember. UA has another security check right at the boarding area. After u have check in your luggage, you head to the boarding area. You have to go through a another body search and stuff. So it's best to get there as soon as you can So that you can get though that. It can jam up a little there...