$76 Cheap Flights from Boise (BOI) to Seattle (SEA)

View $76 flight on Wed, Sep 10, 2025Opens in a new window

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

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Cheap Flights from Boise to Seattle (BOI-SEA)

Prices were available within the past 7 days and start at $76 for one-way flights and $117 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, Sep 3 - Sat, Sep 6
BOI
Boise
SEA
Seattle
$117 Roundtrip, found 3 hours ago
$117
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Wed, Sep 3 from Boise to Seattle, returning Sat, Sep 6, priced at $117 found 3 hours ago
Delta
Wed, Sep 3 - Sat, Sep 6
BOI
Boise
SEA
Seattle
$117 Roundtrip, found 3 hours ago
$117
Roundtrip
found 3 hours ago
Select Delta flight, departing Wed, Sep 3 from Boise to Seattle, returning Sat, Sep 6, priced at $117 found 3 hours ago
Southwest Airlines
Fri, Oct 17 - Tue, Oct 21
BOI
Boise
SEA
Seattle
$120 Roundtrip, found 1 day ago
$120
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Fri, Oct 17 from Boise to Seattle, returning Tue, Oct 21, priced at $120 found 1 day ago
Southwest Airlines
Mon, Dec 8 - Wed, Dec 10
BOI
Boise
SEA
Seattle
$134 Roundtrip, found 3 days ago
$134
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Mon, Dec 8 from Boise to Seattle, returning Wed, Dec 10, priced at $134 found 3 days ago
Alaska Airlines
Fri, Aug 15 - Sat, Aug 16
BOI
Boise
SEA
Seattle
$137 Roundtrip, just found
$137
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Aug 15 from Boise to Seattle, returning Sat, Aug 16, priced at $137 just found
Southwest Airlines
Wed, Oct 15 - Sat, Oct 18
BOI
Boise
SEA
Seattle
$139 Roundtrip, found 3 days ago
$139
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Wed, Oct 15 from Boise to Seattle, returning Sat, Oct 18, priced at $139 found 3 days ago
Southwest Airlines
Tue, Oct 21 - Thu, Oct 23
BOI
Boise
SEA
Seattle
$142 Roundtrip, found 1 day ago
$142
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Oct 21 from Boise to Seattle, returning Thu, Oct 23, priced at $142 found 1 day ago
Alaska Airlines
Sat, Aug 16 - Sat, Aug 23
BOI
Boise
SEA
Seattle
$147 Roundtrip, found 3 hours ago
$147
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Sat, Aug 16 from Boise to Seattle, returning Sat, Aug 23, priced at $147 found 3 hours ago
United
Tue, Oct 7 - Wed, Oct 8
BOI
Boise
SEA
Seattle
$168 Roundtrip, just found
$168
Roundtrip
just found
Select United flight, departing Tue, Oct 7 from Boise to Seattle, returning Wed, Oct 8, priced at $168 just found
Hawaiian Airlines
Mon, Aug 11 - Sat, Aug 16
BOI
Boise
PAE
Seattle
$174 Roundtrip, found 2 days ago
$174
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Mon, Aug 11 from Boise to Seattle, returning Sat, Aug 16, priced at $174 found 2 days ago

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

January is typically the cheapest month to fly

From $76 - $197 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Boeing Field BFI. Cheapest option available. Average driving time to city center is 10 minutes. Flights from $936
BFI
Boeing Field
Cheapest
Average driving time to city center10 min
Flights from $936
0
Flights from Boise (BOI) to Seattle (SEA)
Origin airport
Boise
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$117
Distance
397 mi

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 September. 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 2025. You can also book with separate airlines for your outbound and return journeys, from $76 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.

 

Frequently asked questions

How much does a flight from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA) cost?
You can land cheap return tickets from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA) starting from $116. Book your seat and set off on your next adventure. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Alaska Airlines flight leaving BOI on July 27 2025 and touching down at SEA. The price was last updated on July 9 2025 and has not changed since.
What is the cheapest month to fly from BOI to SEA?
The cheapest flights from BOI to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA)?
You can fly nonstop from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA) on an Alaska Airlines flight.
What is the cheapest airline that flies from BOI to SEA?
At the moment, the cheapest carrier operating one-way flights from BOI to SEA is Alaska Airlines. You can jet off on this route from $79. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from BOI on October 4 2025. Prices were last updated on July 9 2025 and have not changed since.
How many flights per day from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA)?
With an average of 14 nonstop flights that operate from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA) daily, you'll be soaring through the skies in no time.
What are the most popular departure times for flights from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA)?
More passengers fly between BOI and SEA at 9 AM than at any other time of day. Looking for a quieter experience? Pick a flight outside the busiest times and there's a chance you'll save on your fare as well.
What day of the week has the most flights from BOI to SEA?
Travel on a Friday if you're searching for the largest selection of flights from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA)?
The earliest flight departing from Boise Airport (BOI) is at around 5:45AM UTC-7. Catch this flight and you'll reach Seattle - Tacoma Intl. Airport (SEA) at approximately 6:38AM UTC-8. The total time in the air is 1h 53m.
How long does it take to fly from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA)?
The average flight time from BOI to SEA is 1 hour and 46 minutes, covering a total distance of 400 mi.
What airline has the least delays from BOI to SEA?
With 100% of journeys typically landing on time, Air France has the best on-time performance for nonstop flights from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA). To check your flight status and get notified about any changes, simply head to the Expedia App.
What is the best time to fly from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA)?
Choose a flight from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA) that takes off before 3 PM to reduce the risk of cancellations. Later departures have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Seattle from Boise Airport (BOI)?
Seattle - Tacoma Intl. Airport (SEA) is the only airport in Seattle with direct flights from Boise Airport (BOI). Consider the options and discover cheap fares on Expedia.
Is it cheaper to buy a plane ticket from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your ticket from BOI to SEA just before your journey is generally more expensive. However, if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a BOI to SEA flight and hotel package?
You can save money by booking a BOI to SEA flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your preferred flights and accommodations, you can add extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Boise Airport (BOI) to Seattle - Tacoma Intl. Airport (SEA)?
In most instances, you can cancel or reschedule your BOI to SEA flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's guidelines and fees on flight changes, or if you'd like further details, go to our Customer Service portal.

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