The cheapest times to fly from BOI to SEA are
- January 15th to February 4th
- February 19th to March 11th (except the week of February 26th)
- April 2nd 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 BOI to SEA is early to mid July. Prices can be as high as $242 for Sunday flights during mid to late November, or as low as $93 for Tuesday flights around early to mid July.
When to Fly to Seattle
Flying from Boise, ID (BOI) to Seattle, WA (SEA) 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 to late November, with an average price of $189. Planning your trip to low-cost times can easily save you $96 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 BOI to SEA flight.
See below for a graph of average weekly prices for the BOI to SEA route. All prices are for round-trip tickets in USD.
Compared to other flights, the BOI to SEA flight is much cheaper than the average and costs much less than the average flight leaving from Boise. 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 $126. Return trip prices are from the SEA to BOI 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 BOI to SEA 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 BOI to SEA? 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 Seattle/Tacoma International Airport to Boise Air Terminal Airport?
The distance between the two airports is roughly 398 miles or 641 kilometers.
How long does it take to fly from BOI to SEA?
The real-world flight time for a nonstop BOI to SEA flight is about 1 hour 42 minutes.
How many flights go between Boise, ID and Seattle, WA?
It depends on the day of the week and the date, but a typical day might have around 58 available flights from BOI to SEA.
Airport Location Info
|Origination airport name||Boise Air Terminal Airport|
|Country||the United States|
|Destination airport name||Seattle/Tacoma International Airport|
|Country||the United States|
Late and Early Flight Data
Flights from BOI to SEA tend to depart late far less frequently than the average flight. According to our recently updated data, 19% of flights departed 5 or more minutes late, and 21% of flights left 5 or more minutes early. On average you can expect to leave SEA heading for BOI about 3 minutes late. This does significantly impact arrival time, as the average landing time in Seattle, WA is about 2 minutes late. The numbers below show a recent average of take-off times versus the scheduled departure flight:
- SkyWest: 1 minutes early
- Alaska: 7 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.