$54.41
Description
Using data from http://css.umich.edu/factsheets/carbon-footprint-factsheet, CO2 generated averages 0.39 lbs / mile per person.
3322 mile flight from NYC to Seattle and on to Juneau, 6644 miles round trip, = 2,591.2 lbs CO2 per person.
At $0.021 per pound CO2, round trip cost = $54.41 to offset