The Co-operative Travel is projecting a 38% rise in online sales by the end of the year.
Visits to the company’s website are up by 22% in the year to August, and time spent on the site has increased by almost 30%.
Searches for all-inclusive holidays have more than doubled year on year, while searches for city breaks to New York were up by 203%, the company said.
Other destinations on the rise include Turkey, which searches have increased by 13%, while Disney searches are up by 38%.
The site, which re-launched in 2009 as co-operativetravel.co.uk, achieved a sales increase of more than 300% on 2008.
Head of e-commerce Neil Hardy said: “At a time when a lot of the travel industry has seen a decline in sales, it is great for this business to see a continuing rise in holiday bookings.
“This is very much a team effort: we are constantly looking at ways to improve the web proposition, and remain confident that sales will carry on increasing in the years ahead.”