Yes, if you turn on wifi calling then you can stay in airplane mode, turn wifi back on, and Verizon (well, all carriers) will treat it as if you were in the US. Just make sure your phone says VZW Wifi.

It's actually creating an IPSec VPN connection back to Verizon and tunneling cell data over that connection. So voice and SMS work normally.

To be doubly sure of not being charged, turn off voice and data roaming in settings.

You might need to turn on wifi calling before you leave, when you're still connected to Verizon's network.