The establishing shot of the town in Vermont where Blake's family lives is Montpelier, Vermont. The view is down State Street, with the state Supreme Court and the Pavilion government office building visible at the lower left.
Romy decides in the middle of Christmas Eve dinner that she wanted to go back to Wichita and Blake's family offers to help. The establishing shot of "Vermont USA" is Montpelier, VT, which means the only way to get to Wichita would be on Delta Airlines, leaving at 5:45am from Burlington on Christmas morning, changing planes in Atlanta and arriving in Wichita at 11:19am (Central time). This would place the events when Romy and Blake arrive at the Chen's home around noon on Christmas day.