You can't. Check Alaska Airlines (alaskaair.com) for any possible web specials. Otherwise be sure and purchase your ticket 3 weeks in advance for the best fare. Also look at different days of the week to travel....You can play around on their site and punch in lots of different dates before you have to move to the purchase page. Some days are slightly less expensive than others. The Alaska Marine Highway ferry system is the only "cheap" way to leave Juneau.
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