All international flights are subject to U.S. immigration and customs fees, paid in advance when the ticket is purchased. In addition, many countries have departure fees that are collected at the time of ticket purchase or upon exiting the foreign country. Expenses usually are greater than expected, and travelers should plan to have at least enough cash handy at the end of the trip to pay any unexpected departure fee. Credit cards may be difficult to use in the country you are visiting, or at the airport at which you need to pay a fee.
