The deal was led by PHD Equity partners Andy Dodd and Craig Richardson and director Tony Meakin.
The company intends to use the funds to accelerate growth and provide an exit for Finance Director and shareholder Henri Treffers.
1st Class Holidays offers a selection of luxury tailor-made holidays focused on Canada, North America, New Zealand and Australia.
The company currently has a turnover of £16m and employs 36 people.
The business will continue to be led by Paul Ainsworth and Sharon Mason, who originally founded the business in 1996.