It symbolizes purity. To dream of swallows is an excellent harbinger of peace and happiness albeit with slight longing and melancholy. If they nest in our house it is an even better omen and extended to all members of the household. Seeing a swallow arrive foreshadows news of loved ones. Seeing it leaving indicates the brief departure of a member of the family.
Read more about dreaming of Swallow in other dream meanings interpretations.