Double-digit growth in overall sales last month is being claimed by Global Travel Group across its 350 independent travel agents.
Forward bookings for 2018 are also up year-on-year by 18%.
Top performing destinations for 2017 so far include Spain, with bookings up by 90% including the Balearics and Canary Islands.
Italy and UK domestic holidays have seen sales growth of 20% and 15% respectively.
Bookings to Mauritius and the Indian Ocean have more than doubled with the UAE securing 15% growth so far over the same period in 2016.
The latest booking trends come soon after the consortium reported a 22% increase in new members over the past 12 months.
Global Travel Group managing director, Andy Stark, said: “It’s great news to see these results across the group.
“For those looking to secure a last minute get away this summer, or get a 2018 holiday secured this year, our agents are reporting some stand out deals to Spain and its islands.
“We continue to invest in the range of back-office tools, technology, marketing materials and exclusive training opportunities available to our members to ensure the support we provide is unrivalled.”