I am an American Citizen who will be traveling to France in August. I cannot buy a return ticket because, although I will be leaving within three months, I may or may not leave from France to visit a friend in India before returning home. I am wondering if my one-way ticket will be a problem at the ticket office in the U.S. or at French customs? If anyone has any experience I would appreciate a reply.
It might, even though proof of onward journey is not a formal condition for entry into France. At the very least, make sure that you can proof to have sufficient means of subsistence during your stay: the Dutch autorities require proof that you have at least €34 for every day of your stay, probably the amount is similar for the French situation.
If you ask me, it's easier to simply book a fully refundable ticket back to the US, just to make sure.
Why don't you simply call the French Consulate? I haven't been in France in a number of years, but don't recall any such questions. As a matter of fact, the only time I was asked about funds was when I entered the UK.