A flock of birds in a dream usually represents a group or community. Birds represent intelligence, so if the birds are flying in formation, it may represent a planned and organized group of people.
Many people who dreamed they were part of a flock felt comforted by the idea that they belonged to something bigger than themselves. Meanwhile, others felt anxious about being left out or forgotten when they found themselves in these types of dreams.
Some people believe that if one bird flies out of the flock, it means that someone who has been largely unnoticed has changed their mind about something significant. Others believe it means there is tension among those in the group and that someone will break away to establish their own set of beliefs.