Hope this is true this year. Southwest still only goes to first week of June so they aren't selling yet into August.I find that waiting until Southwest drops their fares helps find lower fares elsewhere. If both JetBlue and SW haven't dropped yet, you're too early. I was searching for air the week before U.S. Thanksgiving, and once SW came out, Air Canada dropped to "only" C$100 more per person to fly from Pearson to MCO compared to Buffalo direct to MCO.
Of course, that does not include luggage, which flies free on SW, or paying to park our car for the week, which is far cheaper at BUF than Pearson. Times the difference in airfare by my party of six, and you can see why we're on SW this NYE and why we'll probably take JetBlue to DLR in 2020.
Good that you've found some flights on SW and JetBlue that work and have savings.