Spending on flights rose by 192% in May compared to April, according to data from Revolut's 1.3 million Irish customers, while hotel spending jumped by 91%.
Revolut noted that spending on flights was higher than average among the 55+ age group, suggesting a "vaccination bounce" in travel.
However despite the increase, overall spending on airlines in May was still less than half of what it was in February 2020, before the pandemic struck.
Today's figures show that spending on hotels was also up significantly month-on-month.
The financial technology company said the increase was driven by younger age groups with hotel spending by 18-24-year-olds up 118% month-on-month, with the 35-44 age group seeing the next highest increase of 90%.
Restaurants and bars also saw a significant boost in spending in May and Revolut said its customers spent 57% more in bars compared to the previous month.
Expenditure in restaurants was also 20% higher in May than in April.
Overall Irish consumer spending in May grew by 11% month-on-month as the country began to reopen. Revolut said this bodes well for this month's easing of hospitality restrictions.
May saw a big boost for retail with spend in clothing stores, shoe shops, jewellers, sportswear shops, departments stores and toy shops all soaring.
Overall spending in clothing stores was up by 51% in May versus April, the Revolut data shows.
Hairdressers, taxi drivers, florists and dry cleaners also saw spending rise as restrictions eased.
Spending in hairdressers and barbers soared by 466% compared to the previous month.
Taxi drivers also saw spending increase again, by 136% compared to April, while spending at dry cleaners was up 9% and at florists up 8%.
But Revolut noted that a large proportion of retail shopping was still being carried out online despite shops having reopened.
In sportswear, 65% of spending was still carried out online, while 60% of spending in toy stores was carried out over the internet, as was 50% of clothes shopping.
Sebastian Hamilton, Head of Public Affairs at Revolut Ireland, said that the surge in retail spending will be a relief to retailers as they finally reopened their doors to shoppers.
"The travel industry will be hopeful that the spike in spending on flights and hotels marks the start of a rebound for their sector too," Mr Hamilton said.
"The fact that a majority of retail shopping is still taking place online is significant, however. It is an adjustment to consumer behaviour which the retail sector will have to take on board to ensure that its digital and physical offerings are tailored to the needs of post-pandemic shoppers," he added.