The popularity of tours to Malta in May suggests that the peak season is starting. We are talking about the beach season, of course. And, although people come to the islands mainly for sightseeing, beach centers like Marfa, Marsascala, Sliema are already full. You can also go to the island of Gozo to see the sights. There are plenty of places to swim too, such as the resort town of Schlendi.
Holidays in Malta in spring, especially in the second half, affects the cost of tickets, hotels, even shopping. Prices for vacations in Malta in May become an order of magnitude higher. Nevertheless, this country itself is not considered an excessively expensive resort. And at the end of spring it is still not too hot, perhaps this is a good time for a beach vacation.
If you don't know which cities and resorts you can go to for your budget, use the tripmydream service. It will find the most favorable tours to Malta in spring. The average price for tours to Malta in May will be around 550 EUR for one with flight and accommodation for a one week trip.