While Cancun is definitely cheaper than cities like Los Angeles or Miami, it’s not really the bargain that many people are hoping for. The nicer hotels charge prices that aren’t too far from similar hotels in Hawaii, and hotels lower down the quality range can be disappointing. On the other hand, you can get excellent rates at many of the all-inclusive hotels, especially in the low season, but even during peak periods if you book early enough.
Hotels in Cancun are at their peak in price and activity during the Christmas and New Year’s holiday weeks, as well as during the Easter vacation weeks in late March and April. The rest of the period from December through April is considered the high season, so starting in May bargains can be had, and during summer you can often get great deals at some of the nicer hotels.