$89 Cheap Flights from Boise (BOI) to Seattle (SEA)

View $89 flight on Thu, Jun 4, 2026Opens in a new window

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

Cheap Flights from Boise to Seattle (BOI-SEA)

Prices were available within the past 7 days and start at $89 for one-way flights and $157 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Apr 27 - Tue, May 5
BOI
Boise
SEA
Seattle
$157 Roundtrip, just found
$157
Roundtrip
just found
Select Alaska Airlines flight, departing Mon, Apr 27 from Boise to Seattle, returning Tue, May 5, priced at $157 just found
Alaska Airlines
Wed, May 13 - Sun, May 17
BOI
Boise
SEA
Seattle
$167 Roundtrip, just found
$167
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, May 13 from Boise to Seattle, returning Sun, May 17, priced at $167 just found
Southwest Airlines
Thu, Jun 4 - Mon, Jun 8
BOI
Boise
SEA
Seattle
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Jun 4 from Boise to Seattle, returning Mon, Jun 8, priced at $177 just found
Delta
Thu, Jun 4 - Sun, Jun 7
BOI
Boise
SEA
Seattle
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Delta flight, departing Thu, Jun 4 from Boise to Seattle, returning Sun, Jun 7, priced at $177 just found
Southwest Airlines
Thu, May 7 - Tue, May 12
BOI
Boise
SEA
Seattle
$182 Roundtrip, found 4 hours ago
$182
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Thu, May 7 from Boise to Seattle, returning Tue, May 12, priced at $182 found 4 hours ago
United
Fri, May 29 - Wed, Jun 3
BOI
Boise
SEA
Seattle
$187 Roundtrip, found 4 hours ago
$187
Roundtrip
found 4 hours ago
Select United flight, departing Fri, May 29 from Boise to Seattle, returning Wed, Jun 3, priced at $187 found 4 hours ago
Southwest Airlines
Thu, Jun 4 - Sun, Jun 7
BOI
Boise
SEA
Seattle
$187 Roundtrip, just found
$187
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Jun 4 from Boise to Seattle, returning Sun, Jun 7, priced at $187 just found
Southwest Airlines
Fri, May 8 - Sun, May 17
BOI
Boise
SEA
Seattle
$188 Roundtrip, found 19 hours ago
$188
Roundtrip
found 19 hours ago
Select Southwest Airlines flight, departing Fri, May 8 from Boise to Seattle, returning Sun, May 17, priced at $188 found 19 hours ago
Southwest Airlines
Mon, Jun 1 - Sat, Jun 6
BOI
Boise
SEA
Seattle
$192 Roundtrip, found 4 hours ago
$192
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Mon, Jun 1 from Boise to Seattle, returning Sat, Jun 6, priced at $192 found 4 hours ago
Frontier Airlines
Sun, Jun 14 - Wed, Jun 24
BOI
Boise
SEA
Seattle
$220 Roundtrip, found 8 hours ago
$220
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Sun, Jun 14 from Boise to Seattle, returning Wed, Jun 24, priced at $220 found 8 hours ago

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

April is typically the cheapest month to fly

From $79 - $119 per traveler.

Frequently asked questions

How much does a flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from $89 and cheap return flights from $157 Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) with Expedia. One-way flights usually range from $72 to $568, and return flights typically cost between $161 and $1000. 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 Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
January is the cheapest month to fly from Boise to Seattle, with average round-trip fares around $177. This is about 21% lower than the average price throughout the year, as demand is generally lower in winter. Other affordable months to consider are February and April.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Choose from 7 airlines operating direct flights from BOI to SEA:

  • Delta operates around 50 direct flights from BOI to SEA every week
  • Hawaiian Airlines operates around 36 direct flights from BOI to SEA every week
  • British Airways operates around 7 direct flights from BOI to SEA every week
  • Japan Airlines operates around 7 direct flights from BOI to SEA every week
  • Condor operates around 7 direct flights from BOI to SEA every week

What is the cheapest airline that flies from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Hawaiian Airlines is one of the cheapest airlines offering connecting flights from Boise (BOI) to Seattle (SEA), with round-trip tickets starting from around $217 with a layover in an unspecified location. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
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) will differ from traveler to traveler. If you like to fly early, Alaska Airlines offers early morning flights. If price is the most important factor, Delta typically offers the lowest fares. Alaska Airlines offers the most daily flights from Boise to Seattle, which is great 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.)?
The best time to fly from Boise (BOI) to Seattle (SEA) is typically in January or April, with average return flight prices around $177. January is often quieter after the holiday rush, while April offers pleasant spring weather, making both months ideal for travel. This information is based on booking data from the past year.*Prices based on flights available on Expedia in the last year.
How many flights per day from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
There are approximately 7 nonstop flights per day from (BOI) to Seattle - Tacoma Intl. (SEA). For more options, look at flights that include layovers.
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.) usually departs at around 5:00 AM, operated by Alaska Airlines. This flight is part of a seasonal service active in March, which can be a great time to visit Seattle. An early start allows you to enjoy a full day in the city. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
For flights from Boise, ID (BOI) to Seattle, WA (SEA), the most popular departure times are in the late morning, from 9am to 12pm. This time window accounts for around 24% of total traffic. Airlines like Alaska Airlines, Delta, and United Airlines offer flights during this period. This timing is popular as it allows travelers to enjoy a leisurely morning before heading to Seattle.
How long does it take to fly from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A nonstop flight from BOI to SEA typically takes around 1 hour 50 minutes, covering approximately 398 miles. Connecting flights on this route usually add 5 hours 10 minutes to your travel time. 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.)?
First class is available on flights from BOI to SEA. First class cabins are available on:

  • Hawaiian Airlines
  • Delta Air Lines
  • United Airlines
  • American Airlines

How much is a business class flight from Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A direct, return business class ticket from Boise, ID (BOI) to Seattle, WA (SEA) typically costs between $473 - $772. A non-stop, one-way business class flight is usually around $288 - $438 per adult. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Boise, ID (BOI) to Seattle, WA (SEA-Seattle - Tacoma Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
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 into Seattle - Tacoma Intl. (SEA) Some flights may connect through major hubs like Harry Reid Intl. (LAS), San Diego Intl. (SAN), Salt Lake City Intl. (SLC) 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.) Seattle Vacation Packages 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.
Airlines serving
Alaska Airlines, American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$156
Distance
397 mi

Book with confidence

Boise to Seattle Flights

The cheapest times to fly from Boise to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Boise to Seattle are during the month of April. You can find some of the cheapest flights from Boise to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Boise to Seattle

Sunday is one of the best days to book for cheap flights from Boise to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Boise to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Boise to Seattle in 2026. You can also book with separate airlines for your outbound and return journeys, from $89 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Boise to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Boise to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Boise to Seattle Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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