Cheap flights from Idaho Falls to Seattle from $137

In general, April is the cheapest month to fly from Idaho Falls to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $227. If you don’t want to visit Seattle in April, then you should wait until January to fly from Idaho Falls, when ticket prices are also cheap, with an average price of $235.

On average, the least expensive day to fly to Seattle from Idaho Falls is on a Thursday. momondo users have found tickets for Thursday departures for as low as $384. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Idaho Falls because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $504.

Flying to Seattle from Idaho Falls in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $403 when looking at flights departing in the afternoon. Flights to Seattle are more costly at noon, with an average ticket price of $492. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Idaho Falls Fanning Field to Seattle/Tacoma Intl for the best Idaho Falls Fanning Field - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Idaho Falls when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $299 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Idaho Falls for as low as $221 on momondo.

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

Alaska Airlines and Delta are the most popular carriers operating from Idaho Falls Fanning Field to Seattle/Tacoma Intl

Alaska Airlines, Delta and Hawaiian Airlines are the top three most popular airlines that fly to Seattle from Idaho Falls according to our data. Alaska Airlines is the first choice among our users, with 82% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 3 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

As of March 2026, 4 flights take off from Idaho Falls and land in Seattle each day. The most common flight departure time for this route is 6:00AM, with 60% of daily flights taking off at noon.

As of March 2026, 32 flights take off from Idaho Falls and land in Seattle each week. The most common flight departure day for this route is Mon, with 16% of weekly flights taking off on this day.