Idaho Falls, which is in the line of totality, is served by Idaho Falls Regional Airport. Boise, which will see a partial eclipse, is served by Boise Airport. From Boise, however, you can drive into the line of totality.
As in Wyoming, international travellers will have to pick up a connecting flight from one of the major entry points in the US.
The NASA Google map of the eclipse path also shows roads which you can use to decide on the best route to your viewing place in Idaho.
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Mark Sukhija is a travel and wine blogger, photographer, tourism researcher, hat-touting, white-shirt-wearing, New Zealand fantatic and eclipse chaser. Aside from at least annual visits to New Zealand, Mark has seen eclipses in South Australia (2002), Libya (2006), China (2009) and Queensland (2012). After twelve years in Switzerland, Mark moved back to London in 2012. You can follow Mark on Twitter or Facebook