Cheap flights from Seattle to Idaho from $108

In general, October is the cheapest month to fly from Seattle to Idaho. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $59. If you don’t want to visit Idaho in October, then you should wait until January to fly from Seattle, when ticket prices are also cheap, with an average price of $69.

Our data shows that Saturday is the least expensive day to fly to Idaho. Tickets to fly out on this day can be as low as $198. On the other hand, Sunday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $317.

According to our data, the cheapest time of day to fly to Idaho is at noon. momondo users have found flights departing from Seattle to Idaho at noon for as low as $217. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the evening is when there is more demand to fly to Idaho, so prices are often more expensive at around $229 per ticket.

Fly from Seattle/Tacoma Intl to Boise Air Term. Gowen Fld for the best Seattle/Tacoma Intl - Idaho flight prices

You are more likely to see cheaper flights to Idaho from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Idaho for around $209 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Idaho from Seattle for as low as $159 on momondo.

There are 4 cabin classes available to choose from on Seattle to Idaho flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest, Alaska Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Idaho

Alaska Airlines, Delta and Hawaiian Airlines are the top three most popular airlines that fly to Idaho from Seattle according to our data. Alaska Airlines is the first choice among our users, with 59% of people opting to fly with this airline when traveling to Idaho. Keep in mind that there are 3 different airlines that fly to Idaho on a routine basis, so you have a few additional options to choose from.

The number of flights available between Seattle and Idaho is 63 per day as of May 2026. The most frequent departure time is 7:00PM, with 46% of daily flights leaving in the evening.

As of May 2026, 447 flights take off from Seattle and land in Idaho each week. The most common flight departure day for this route is Thu, with 21% of weekly flights taking off on this day.