Founded in January 1984, Garstang in 2016 became the first TTG Top 50 UK & Ireland's No.1 Travel Agency.
The agency will continue to operate and trade under its existing name and branding as part of Althams Travel Group.
It will also remain in its existing premises, with all nine members of the team retaining their roles.
"After 42 incredible years, it’s the right time to sell," said Eaves. "I leave knowing the business is in great hands.