£81 Cheap Flights from Boise (BOI) to Seattle (SEA)

View £81 flight on Wed, 27 May 2026Opens in a new window

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Popular airlines from Boise Airport (BOI) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Boise (BOI) to Seattle (SEA)

Prices were available within the past 7 days and start at £81 for one-way flights and £146 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sun, 17 May - Sun, 24 May
BOI
Boise
SEA
Seattle
£146 Return, found 3 days ago
£146
Return
found 3 days ago
Select Alaska Airlines flight, departing Sun, 17 May from Boise to Seattle, returning Sun, 24 May, priced at £146 found 3 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
BOI
Boise
SEA
Seattle
£161 Return, found 3 days ago
£161
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from Boise to Seattle, returning Wed, 27 May, priced at £161 found 3 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
BOI
Boise
SEA
Seattle
£165 Return, found 3 days ago
£165
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from Boise to Seattle, returning Wed, 27 May, priced at £165 found 3 days ago
Alaska Airlines
Sun, 17 May - Thu, 21 May
BOI
Boise
SEA
Seattle
£176 Return, found 4 days ago
£176
Return
found 4 days ago
Select Alaska Airlines flight, departing Sun, 17 May from Boise to Seattle, returning Thu, 21 May, priced at £176 found 4 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
BOI
Boise
SEA
Seattle
£179 Return, found 3 days ago
£179
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from Boise to Seattle, returning Wed, 27 May, priced at £179 found 3 days ago
Alaska Airlines
Mon, 18 May - Mon, 25 May
BOI
Boise
SEA
Seattle
£186 Return, found 3 days ago
£186
Return
found 3 days ago
Select Alaska Airlines flight, departing Mon, 18 May from Boise to Seattle, returning Mon, 25 May, priced at £186 found 3 days ago
Alaska Airlines
Sun, 17 May - Sun, 24 May
BOI
Boise
SEA
Seattle
£191 Return, found 3 days ago
£191
Return
found 3 days ago
Select Alaska Airlines flight, departing Sun, 17 May from Boise to Seattle, returning Sun, 24 May, priced at £191 found 3 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
BOI
Boise
SEA
Seattle
£194 Return, found 3 days ago
£194
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from Boise to Seattle, returning Wed, 27 May, priced at £194 found 3 days ago
Alaska Airlines
Wed, 20 May - Wed, 27 May
BOI
Boise
SEA
Seattle
£197 Return, found 3 days ago
£197
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 20 May from Boise to Seattle, returning Wed, 27 May, priced at £197 found 3 days ago
Alaska Airlines
Sun, 17 May - Sun, 24 May
BOI
Boise
SEA
Seattle
£198 Return, found 3 days ago
£198
Return
found 3 days ago
Select Alaska Airlines flight, departing Sun, 17 May from Boise to Seattle, returning Sun, 24 May, priced at £198 found 3 days ago

Find the cheapest month to fly from Boise (BOI) to Seattle (SEA)

April is typically the cheapest month to fly

From £60 - £90 per traveller.

Frequently asked questions

How much does a flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
One-way flights typically cost between £223 and £1,373 and return flights often range between £223 and £1,373. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
What is the cheapest month to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
January is typically the cheapest month to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.), with average return fares of approximately £245. This is about 22% lower than the average price throughout the year. January often sees lower prices because it falls after the busy holiday travel season, when demand for flights usually decreases. Other cheap months to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) include February and April.
Which airlines fly direct from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Enter BOI to SEA and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best airline to fly with from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will differ from traveller to traveller. If you like to fly early, DL offers early morning flights. If price is the most important factor, DL typically offers the lowest fares. AS offers the most daily flights from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Based on booking data from the past year, the cheapest months to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) are typically January and April, with average prices around £245 for a return flight. However, the most popular months for this route are November and December, meaning you'll find plenty of flight options during those times. If you're looking for the best value, aiming for January or April will help you save on your airfare.
How many flights per day from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
There are approximately 8 nonstop flights per day from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.). For even more choice, look at flights that include layovers. You'll find around 43 connecting flights per day. Some common connection points include Portland Intl. (PDX), Denver Intl. (DEN), and San Francisco Intl. (SFO).
What is the earliest flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) typically departs at approximately 5:00 AM local time, operated by Alaska Airlines. This is a seasonal service active in March. An early departure like this can help you maximise your time in Seattle. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You'll typically find the most flights from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) on a Friday, with around 59 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Alaska Airlines, Southwest Airlines, and United Airlines. Flight schedules are fairly consistent throughout the week, with Friday offering only slightly more options than other days.
What are the most popular departure times for flights from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) are in the early morning, from 6am to 9am. About 23% of passengers prefer this time. Many major carriers, including Alaska Airlines and Delta Air Lines, offer flights during this window. This timing works well because it allows you to get an early start on your day in Seattle.
How long does it take to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Direct flights from BOI to SEA usually take about 1 hour 50 minutes, traveling roughly 398 miles. If you opt for a connecting flight, expect to add around 5 hours 40 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Select the "Business class" and "First class" filters when looking for BOI to SEA flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle from BOI (BOI)?
If you're planning to travel to Seattle from BOI (BOI), you can fly directly into Seattle - Tacoma Intl. (SEA) Some flights may connect through major hubs like Seattle - Tacoma Intl. (SEA), Portland Intl. (PDX), McCarran Intl. (LAS) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

0
Origin airport
Boise
Destination airport
Seattle - Tacoma Intl.
Return price
£145
Distance
636 km

Book with confidence

Compare flights from Boise to Seattle easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Boise to Seattle. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Seattle - Tacoma Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Boise to Seattle - Tacoma Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Boise (BOI) to Seattle - Tacoma Intl. (SEA)

The easiest way to view the best deals on flights from Boise to Seattle today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Boise to Seattle - Tacoma Intl. start at just £146 and range up to £198.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Boise and Seattle
  • booking your flight during May, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Boise to Seattle flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Boise to Seattle - Tacoma Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Boise to Seattle easily and book with confidence

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