Yes, killer whales often travel in groups. These groups are often called pods. Usually, a typical pod consists of 5-30 whales. This is many whales. However, the pod does not stop here. Sometimes, a single pod can have as many as 1000 whales. It really depends on the season and the route of travel as well as the pod in question.
Killer whales or orcas prefer to travel as groups. Many other animals opt for a similar behavior, which is a primary survival instinct in many living things. Part of the reason they travel together is that killer whales are family oriented fish and tend to stick with their families.
