Travel, journey and trip.

Travel is used to mean the general activity of moving from one place to another.

Journey refers to travelling a long distance, or travelling regularly, emphasizing on the idea of travelling itself.

Trip refers to travelling a short distance, or an unusual journey, emphasizing on the place or the reason of travelling.

• travel
  Air travel is faster than rail travel.
  His job involves a lot of travelling.
  
  
• journey
  We had a long journey through the mountains.
  He usually reads the paper during the train journey to work.
  
  
• trip
  His job involves a lot of business trips.
  Our trip to Las Vegas was great.

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