The cheapest times to fly from SEA to BOI are
- January 8th to February 4th
- April 9th to July 22nd (except the week of May 7th)
- August 20th to November 18th
based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to BOI is early to mid July. Prices can be as high as $253 for Sunday flights during mid December, or as low as $93 for Tuesday flights around early to mid July.
When to Fly to Boise
Flying from Seattle, WA (SEA) to Boise, ID (BOI) will usually cost between $93 to $185 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid July with an average ticket price of $93. Due to high demand the most expensive time to fly is mid December, with an average price of $195. Planning your trip to low-cost times can easily save you $102 on economy flights and even more on first-class flights. Generally, any price below $138 can be considered a good price for a round-trip SEA to BOI flight.
See below for a graph of average weekly prices for the SEA to BOI route. All prices are for round-trip tickets in USD.
Compared to other flights, the SEA to BOI flight is much cheaper than the average and costs much less than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.22, which is below average.
Flight Prices by Day of the Week
Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $14 (10%) on this flight.
Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $125. Return trip prices are from the BOI to SEA flight, and often highlight the quality of our data in showing the same trend.
Departing Prices by Day
Return Trip Prices by Day
Nonstop Flights and Layovers
Travelers looking to fly from SEA to BOI can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 1 hour 42 minutes may be realistic.
Flight Questions Answered
Still have questions about flying from SEA to BOI? We’ve got answers.
Which airlines fly this route?
You can find 6 major airlines flying this route most often: Alaska, American, Delta, Frontier, Southwest, United, and potentially more during busy seasons.
How far away is it from Boise Air Terminal Airport to Seattle/Tacoma International Airport?
The distance between the two airports is roughly 398 miles or 641 kilometers.
How long does it take to fly from SEA to BOI?
The real-world flight time for a nonstop SEA to BOI flight is about 1 hour 42 minutes.
How many flights go between Seattle, WA and Boise, ID?
It depends on the day of the week and the date, but a typical day might have around 45 available flights from SEA to BOI.
Airport Location Info
|Origination airport name||Seattle/Tacoma International Airport|
|Country||the United States|
|Destination airport name||Boise Air Terminal Airport|
|Country||the United States|
Late and Early Flight Data
Flights from SEA to BOI tend to depart late far less frequently than the average flight. According to our recently updated data, 21% of flights departed 5 or more minutes late, and 23% of flights left 5 or more minutes early. On average you can expect to leave BOI heading for SEA about 7 minutes late. This does not significantly impact arrival time, as the average landing time in Boise, ID is about 2 minutes early. The numbers below show a recent average of take-off times versus the scheduled departure flight:
- SkyWest: 7 minutes late
- Alaska: 6 minutes late
- Some airlines not reporting
Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.