Uh...
"The foliage season in Northern Vermont runs from early September to mid-October. The peak usually falls on the last two weeks of September when visitors can see the whole palette of colors: green, yellow, red, and orange."
I'm either not following you (quite possibly!), or you need to research airline flights between El Paso and Burlington.
Bennington is in southern Vermont. I went to high school 50 miles SE of there in MA. Peak foliage is usually later. Twice since 2018 I have ridden south from near the Canadian border starting the weekend after Labor Day weekend. I was always ahead of the significant foliage change.
That aside, I agree that making it there in time could be tight. Plus, you have competition for accommodations from “leaf peepers.” My school was in a historic village. For a short period every fall we would have lots of fall foliage tour buses stop in town.