- Do I need my passport or birth certificate or health card for I.D.? - Where do I buy the ticket? - Can a 15 year old cross the Canada/U.S border via greyhound by themself? P.S. (does buying a ticket need credit card info or can you just buy it with money)|||You need a passport, and you can buy the ticket with cash. So........are you 15 or 21 like your profile states? If you are 15 you are considered a minor in the U.S. and there will be many things you would not be able to legally do, like rent a hotel room or a car.|||You need a passport and signed papers from your parents allowing you to travel. Plus an adult to meet you when you arrive. You need to be 18 to buy said ticket.

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