I'm in Niagara, 5 minutes from Hamilton, and usually fly Southwest out of Buffalo, but due to higher pricing this year, tried Swoop from Hamilton in March. It was decent, although I was surprised to find the airport has pretty much doubled its parking rates since my last visit. I considered Swoop this summer, but decided to try out Frontier out of Buffalo. I'm flying in August with a bare bones ticket (no seat selection, no checked or carry-on baggage, just a personal item). Price is $115 USD return for a direct flight with decent departure times. I'll see how it goes. Like Swoop, adding even a carry-on will pretty much double the price, however.