I am buying flight tickets for a forthcoming trip. The website that I am booking through allows me to pay in many different currencies. I have one credit card each for payment in three different currencies. As you know, I would incur no currency exchange fee if I pay in the currency that a card uses. Based on the current foreign exchange rates, does it make sense to prefer paying in one currency over another? If yes, then how do I choose that currency?
For example, if the current rates suggest that USD is growing over EUR, does it make sense to pay in USD?
I know that practically the difference may not be much, but I would like to save whatever little I can.