Originally Posted by
belfordrocks
This will depend on your card, and not United. Some will charge for all fees in foreign currencies, others will charge for all fees processed offshore, regardless of payment currency.
Edit: and of course, others won't have foreign transaction fees at all, which you should use whenever possible
Agreed. Here is an example from the Canadian website charged to a Canadian Amex. You can see the merchant address shows a postal code in Canada. Maybe for some countries the transaction is still processed in the US?