The peak season in Antigua is the winter season, not only can you escape the dreadful English weather, but during December and April Antigua benefits from very dry but warm weather. Book your flights to Antigua in advance to save some money during this period as the island gets very busy with crowds. May and June offer similar weather and you might find cheap flights to Antigua then however there are lots of festivals on offer starting in May. This isn’t a bad thing although it can push the price of flight tickets up by a considerable amount.
Between May and November is classed as the low season, the weather is still very pleasant, in fact July and August can almost be unbearable, although the end of July does host the Summer Carnival. It’s a 10 day long festival which isn’t to be missed if you’re in Antigua at that time of year, however if you do intend to visit make sure you book your flights to Antigua early as they can get very expensive. September to November is the hurricane season and Antigua isn’t spared any punches. You’ll find the cheapest flights to Antigua at this time of year although a lot of places might be closed or the dangerous weather could prevent you from doing a lot. The weather is still warm, although sometimes it gets very muggy.
(prices quoted are from London)