That would depend on where you are flying from and when.
Like any other ship, plane or train, they would buy a ticket at the company's ticket office.
around 300$
Chile
maybe 200 at the most
the plane ticket
The round trip from Illinois to Tennessee will cost $199.
It would cost $86.31
You would have to first get a passport to come and visit the US and then get a plane ticket and fly to your destination.
it is 400 dollars
A return ticket from Berlin to Port of Spain will set you back around 890.00GBP
Lets say you buy a plane ticket and hotel on your own. Flight: 500 Hotel 36/night Travel agent would sell you the same package for say 636. Since they are doing the work for you there are "fees" they will charge. Depending on your agency, this could be worth doing...some people prefer to not use them.