Cheap flights from Boise to Seattle from $109

In general, January is the cheapest month to fly from Boise to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $139. If you don’t want to visit Seattle in January, then you should wait until February to fly from Boise, when ticket prices are also cheap, with an average price of $152.

On average, the least expensive day to fly to Seattle from Boise is on a Friday. momondo users have found tickets for Friday departures for as low as $358. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from Boise because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $566.

Flying to Seattle from Boise in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $450 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $496. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Seattle from Boise when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $194 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Boise for as low as $162 on momondo.

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

No. A direct flight is the cheapest option for a flight between Boise to Seattle.

As of May 2026, prices for Boise to Seattle flights are approximately 14% cheaper when compared to flights at the same time last year.

Southwest, Alaska Airlines, and Delta are the most popular carriers operating from Boise Air Term. Gowen Fld to Seattle/Tacoma Intl

Alaska Airlines, Delta and Hawaiian Airlines are the top three most popular airlines that fly to Seattle from Boise according to our data. Alaska Airlines is the first choice among our users, with 57% 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.

Historically, on average around 12% of flights between Boise and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 116 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 7% of their flights experiencing any sort of delay.

As of May 2026, there are 35 flights per day flying from Boise to Seattle. The most common time of day flights depart is 10:00AM, with 41% of flights taking off at noon.

As of May 2026, 249 flights take off from Boise and land in Seattle each week. The most common flight departure day for this route is Tue, with 17% of weekly flights taking off on this day.