Vacation packages can occasionally save one money compared to purchasing air and hotel separately, but it depends on ones departure city, destination, and hotel. One of the most common ways for such savings to occur is via bulk airfares, which include different restrictions compared to published airfares, one of them often being that they have to be purchased in conjunction with a hotel or car reservation. Bulk fares are not offered in all markets or by all carriers in a given market. It's unlikely that many bulk fares will be available over the US Thanksgiving holiday in a market where lots of people are likely flying to see family.
one example of bulk fare vacation packages saving people money would be Southwest Airlines LAS vacation packages circa 2003. Roundtrip airfare and two nights at the Westward Ho hotel and casino would often cost 25-50% less than the airfare alone.