According to a survey by CheapFlights.com, Bellingham International Airport has the cheapest airline tickets in the U.S. Here’s a (link) to the study.
While Bellingham topped the list, with an average ticket price of $256, Anchorage, Alaska was the most expensive, averaging $863 a ticket. Seattle was also closer to the bottom of the list, averaging $588 a ticket.
The website doesn’t mention what data/methods they used, but no doubt having a low fare airline like Allegiant handling most of the flights out of Bellingham helped. I would guess we wouldn’t be on top if Bellingham had flights to further destinations like Hawaii or the East Coast, but it’s still interesting to compare to other airports like Spokane ($485) or Boise ($476). I didn’t see Medford on there, which might be the best apples-to-apples comparison.