"There is my return ticket."
Translation:Voilà mon billet de retour.
I don't know about that, perhaps in direct comparison: voici mon crayon, voilà le tien but my Harrap's lists a number of uses of voila that correspond to here (it) is. The more I think about it, the more I become convinced that Voilà mon billet de retour should be translated as Here is my return ticket.
That's because it is incorrect. The term "there is" in English can have more than one meaning.
"There is a dog in that house", "there is an egg in the fridge", "there is a message in his smile" - in these cases, "there is" means to inform you that the item in question exists. Whether it is present or not is not significant. The word "there" is figurative. For this, you would use "Il y a" in French.
"There is my book/your hat/my ticket" is demonstrative, the item is present and you are indicating its presence. It isn't elsewhere, it is there. The word "there" is literal. And for this, you use "voilà"
I hope that helps.
Edit: The above still seems a useful distinction, but please see the conversation with Fr0sch below.
Hmmmm everytime i bought a return ticket in France it was an aller-retour as opposed to an aller-simple one way. Never heard billet de retour!
If you buy a round trip to Rome, when you get to Rome, you now have a return ticket to Paris (your starting point). You don't buy a return ticket alone in the general case. If you bought a plain old one-way ticket to Rome, in Rome you would have to buy a ticket to Paris, not a return ticket. So, I think that is why you haven't heard people talking about buying them, they have them as a result of using the first portion of the "aller et retour". At least it works that way in English.
But a return ticket is a ticket there and back. If you ask someone to translate something from English to French, you should accept all reasonable correct translations of the English. Unless, of course, you are trying to annoy people, in which case, please carry on marking correct translations wrong. It works a treat
"But a return ticket is a ticket there and back. " That is British English. That is a "round trip" ticket in American English. In French a round trip ticket = aller-retour (go-return). Three different languages on a collisions coarse...if one train leaves at 5 and travels at 30 mph (American) and the other leaves at 17 h. and travels at 40 kph ...