Aeromexico Fares

Have you ever tried using a VPN to fool the airline into thinking you live somewhere else? You can often see substantial differences in prices when you do. For example, if you book flights and the airline thinks you are in cities with very strong economies, the prices will be higher. If you tell the VPN to display to the Internet that you live in a lower socio-economic region, they will drop the price. It is called dynamic pricing.

I am guessing that if Aeromexico thought you lived in Mexico and you asked for prices in pesos, the ticket price would be much lower. Just an untested hypothesis.

Also, remember that you can fly down to San Diego, make your way to the Tijuana airport, and then fly directly to Zihuatanejo via Volaris. It's a domestic flight so no customs in Zihua. I have no idea what types of pooch provisions Volaris has.