You travel when you move from one place to another. For example,
How often do you travel for work?
Journey
A journey is the noun used to indicate that one is going to travel from one place to another. For example,
The journey from my home to work takes an hour.
Trip
A trip is when you go somewhere, usually stay for a short time and come back. For example,
Ms Moreira is on a business trip. She'll be back on Friday.
Voyage
A voyage is a long journey, usually by boat. It is not often used in modern English. For example,
The sea voyage from Europe to America in the past was long and hard.
Tickets
When you buy a ticket for any journey, you can get a one-way ticket ( one way or single ) or a round-trip ( round-trip or return ticket). A one-way ticket includes one journey from AB. A round-trip ticket includes two journeys from AB and from BA.
If you are a student or a senior (over 65 years old), you can often get a reduction off the total price. This means you can spend 30-50% less. In some countries, children and seniors travel for free.
On some train journeys and flights, you can reserve a seat. This means you can choose where you sit, usually for a small extra fee.
Trains and planes often have two or more different classes: economy class, business class, and first class . Economy class seats are always the cheapest, while the more expensive first class often offers more comfortable seats and extra services included in the price.