International Charging

Or if you prefer, you can just buy a plug adapter (you don't need a converter). The following is an entire kit but you should be able to find single adapters. Apple World Travel Adapter Kit - Apple

Voltage on the USB side is universal ... the "charger" is actually inside your device, the AC adapter just supplies power to the charging circuit. So all you need is something to adapt the AC prongs to your usual iPhone adapter.

I would think you'd be able to pick up a couple of inexpensive USB chargers at the airport when you get there.

Technically you only need a plug adapter. Apple chargers are universal and can take almost any voltage from around the world.