The number of UK travellers to Spain rose by 9.3% in May to account for more than a quarter of international visitors to the country.
Overall numbers were up by 7.4% to 5.8 million against the same month last year.
The Balearic islands was the main destination for British holidaymakers, registering a 10.8% rise.
The Canary Islands received 690,000 visitors, up 8.5% on May 2012, with the UK accounting for the majority of visitors with 10.5% growth.
However, the overall number of package holidays to Spain dropped by 6.4% in May to represent 28.8% of the total visitor market.
International arrivals in the first five months of the year rose by almost 4% to 19.8 million, with the UK maintaining its position as the strongest inbound market with a 4.4% increase.
This represented more than 22% of all international visitors, followed by Germany (16.4%) and France (16.4%), according to the Spanish Tourist Office.
Overall tourism expenditure was up by 7.9% in January to May to more than €18 million.