What is the most punctual flight time for Boston to Seattle flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

Which airline has the best punctuality record on Boston to Seattle flights?

Over the last year, Delta have had the lowest number of delays on this route, with just 11% of flights being delayed.

How often are flights from Boston to Seattle delayed?

About 12% of weekly flights between Boston and Seattle have experienced delays in the past year, with the average delay time being 184 minutes.

What day of the week experiences the fewest flight delays on this route?

Wednesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

How popular is this Boston to Seattle flight route?

Flights from Boston Logan Intl to Seattle/Tacoma Intl have been viewed 49 times in the past calendar month.

How long is the flight from Boston to Seattle?

Departing from Boston to Seattle will take you 6h 28m. The distance between Boston and Seattle is about 2487 mi. Generally, flights for this route are nonstop.

What are the cheapest airlines flying from Boston to Seattle round-trip?

According to our current data, JetBlue ($118), Hawaiian Airlines ($125), and Delta ($127) offers the cheapest pricing from Boston to Seattle. These flights start at 67% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from Boston to Seattle one-way?

One-way options have recently been found by users for as low as $98 on American Airlines. Other airlines that offer cheap prices include JetBlue from $107 and Alaska Airlines from $108 one-way.

Weekly flight availability from Boston to Seattle

The most flights from BOS to SEA are scheduled on a Monday (29 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (17 on average).

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

What are the cheapest flights from Boston to Seattle?

On average you can expect to pay $996 for a flight from Boston to Seattle. The cheapest flight overall is $153 while the most popular route, (Boston Logan Intl - Seattle/Tacoma Intl) is currently priced at $257.

What are the most reliable airlines from Boston to Seattle?

Consider TAP AIR PORTUGAL (100%), Japan Airlines (88%) or LATAM Airlines (88%) when booking your flight. These represent the most reliable airlines when flying from Boston to Seattle.

What are the most popular airlines that fly from Boston to Seattle?

Before booking your flight from Boston to Seattle check out the most popular airlines for this route: Delta, JetBlue or Alaska Airlines.

Most accurate provider : When it comes to deals on Boston-Seattle flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Boston-Seattle flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Boston-Seattle flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Boston-Seattle flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airports do I use to fly from Boston to Seattle?

You will need to book a flight from Boston Logan Intl to Seattle/Tacoma Intl if you want to fly from Boston to Seattle. At least 8 different airlines have flights from Logan Intl (BOS) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 22 flights to Seattle from the Boston airport per day. If you manage to book one that is nonstop, then you can expect the flight time from BOS to SEA to be around 6h 15m.

Can I find deals for flights from Boston to Seattle that include hotel bookings?

Yes. In addition to deals on Boston to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Boston to Seattle?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Seattle.

Can I find deals for business class flights from Boston to Seattle?

Yes. Cheapflights offers flight deals from Boston to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$154+ Flights from Boston to Seattle

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Find cheap flights from Boston to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Boston Logan Intl to Seattle/Tacoma Intl are usually found in March or January, booked 35 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Boston to Seattle

Cheapest flights from Boston to Seattle
Explore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

Mon 12/2211:49 amBOS - SEA

1 stop8h 17mSun Country Air

Mon 12/296:26 pmSEA - BOS

1 stop13h 25mSun Country Air

Deal found 12/8

$371

Mon 12/153:16 pmBOS - SEA

1 stop9h 30mUnited Airlines

Mon 1/129:25 amSEA - BOS

1 stop9h 17mUnited Airlines

Deal found 12/7

$377

Fri 12/2611:49 amBOS - SEA

1 stop8h 35mSun Country Air

Fri 1/26:45 pmSEA - BOS

1 stop13h 06mSun Country Air

Deal found 12/8

$381

Tue 12/163:16 pmBOS - SEA

1 stop9h 30mUnited Airlines

Mon 1/57:00 amSEA - BOS

1 stop7h 17mUnited Airlines

Deal found 12/9

$382

Wed 12/249:08 amBOS - SEA

Nonstop6h 19mAlaska Airlines

Wed 12/317:50 pmSEA - BOS

1 stop7h 20mAlaska Airlines

Deal found 12/8

$397

Mon 12/154:20 pmBOS - SEA

1 stop9h 08mUnited Airlines

Wed 12/179:25 amSEA - BOS

1 stop9h 18mUnited Airlines

Deal found 12/8

$432

Tue 12/162:15 pmBOS - SEA

1 stop9h 39mUnited Airlines

Thu 12/185:02 amSEA - BOS

1 stop7h 33mUnited Airlines

Deal found 12/8

$437

Best flights from Boston to Seattle
Discover carefully curated flight deals from Boston to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 10, 2025.

Thu 1/86:45 pmBOS - SEA

Nonstop6h 28mDelta

Mon 1/1210:25 pmSEA - BOS

Nonstop5h 25mDelta

Deal found 12/8

$307

Mon 3/96:24 pmBOS - SEA

Nonstop6h 36mAlaska Airlines

Wed 4/13:35 pmSEA - BOS

Nonstop5h 19mAlaska Airlines

Deal found 12/10

$307

Tue 3/1011:10 amBOS - SEA

Nonstop6h 19mDelta

Thu 4/23:43 pmSEA - BOS

Nonstop5h 16mDelta

Deal found 12/10

$307

Sat 2/286:24 pmBOS - SEA

Nonstop6h 36mAlaska Airlines

Mon 3/210:40 pmSEA - BOS

Nonstop5h 14mAlaska Airlines

Deal found 12/9

$307

Sat 2/287:15 amBOS - SEA

Nonstop6h 30mDelta

Mon 3/210:20 pmSEA - BOS

Nonstop5h 30mDelta

Deal found 12/10

$307

Wed 1/216:44 pmBOS - SEA

Nonstop6h 33mAlaska Airlines

Wed 1/287:55 amSEA - BOS

Nonstop5h 25mAlaska Airlines

Deal found 12/10

$307

Sat 1/106:45 pmBOS - SEA

Nonstop6h 28mDelta

Tue 1/207:40 amSEA - BOS

Nonstop5h 29mDelta

Deal found 12/8

$307

Mon 3/96:42 pmBOS - SEA

Nonstop6h 21mDelta

Thu 4/23:43 pmSEA - BOS

Nonstop5h 16mDelta

Deal found 12/10

$307

Sat 3/76:57 pmBOS - SEA

Nonstop6h 28mDelta

Tue 3/317:20 amSEA - BOS

Nonstop5h 23mDelta

Deal found 12/10

$307

Fri 1/306:45 pmBOS - SEA

Nonstop6h 28mDelta

Sat 2/710:25 pmSEA - BOS

Nonstop5h 25mDelta

Deal found 12/8

$307

Thu 1/87:15 amBOS - SEA

Nonstop6h 30mDelta

Sat 1/107:15 amSEA - BOS

1 stop14h 03mDelta

Deal found 12/9

$316

Last-minute flights from Boston to Seattle
Discover last-minute flight deals from Boston to Seattle. Data last updated December 10, 2025 and is based on user searches.

Mon 1/126:44 pmBOS - SEA

Nonstop6h 33mAlaska Airlines

Wed 1/217:55 amSEA - BOS

Nonstop5h 25mAlaska Airlines

Deal found 12/9

$278

Mon 1/126:44 pmBOS - SEA

Nonstop6h 33mHawaiian Airlines

Wed 1/217:55 amSEA - BOS

Nonstop5h 25mHawaiian Airlines

Deal found 12/9

$297

Mon 1/1212:55 pmBOS - SEA

1 stop12h 25mAmerican Airlines

Sat 1/178:04 amSEA - BOS

1 stop11h 27mAmerican Airlines

Deal found 12/9

$298

Thu 1/156:44 pmBOS - SEA

Nonstop6h 33mAlaska Airlines

Wed 1/213:40 pmSEA - BOS

Nonstop5h 14mAlaska Airlines

Deal found 12/9

$307

Fri 1/236:44 pmBOS - SEA

Nonstop6h 33mAlaska Airlines

Fri 1/307:55 amSEA - BOS

Nonstop5h 25mAlaska Airlines

Deal found 12/9

$286

Fri 1/236:44 pmBOS - SEA

Nonstop6h 33mAlaska Airlines

Wed 1/283:40 pmSEA - BOS

Nonstop5h 14mAlaska Airlines

Deal found 12/8

$287

Fri 1/2312:55 pmBOS - SEA

1 stop12h 25mAmerican Airlines

Sat 1/318:04 amSEA - BOS

1 stop11h 27mAmerican Airlines

Deal found 12/9

$303

One-way flights from Boston to Seattle
Search for one-way flight options from Boston to Seattle. Find affordable one-way fares based on user searches. Data last updated December 10, 2025.

Tue 1/66:06 pmBOS - SEA

Nonstop6h 24mAlaska Airlines

Deal found 12/8

$154

Fri 1/168:47 amBOS - SEA

2 stops32h 56mFrontier

Deal found 12/10

$155

Sun 1/255:27 pmBOS - SEA

3 stops20h 52mMultiple Airlines

Deal found 12/10

$156

Mon 1/1212:55 pmBOS - SEA

1 stop12h 25mAmerican Airlines

Deal found 12/10

$157

Fri 1/167:00 amBOS - SEA

3 stops32h 47mMultiple Airlines

Deal found 12/10

$158

Wed 1/147:55 amBOS - SEA

1 stop10h 49mUnited Airlines

Deal found 12/9

$159

Sun 2/87:00 amBOS - SEA

3 stops31h 19mMultiple Airlines

Deal found 12/10

$160

Wed 1/146:00 amBOS - SEA

3 stops32h 09mMultiple Airlines

Deal found 12/8

$161

Mon 1/54:47 pmBOS - SEA

1 stop9h 25mUnited Airlines

Deal found 12/9

$164

Sat 1/243:43 pmBOS - SEA

3 stops22h 36mMultiple Airlines

Deal found 12/7

$166

Sun 3/810:52 amBOS - SEA

2 stops28h 38mFrontier

Deal found 12/9

$167

Find flight deals from Boston to Seattle

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$278 (SmartFares)
One-way from	$154 (Alaska Airlines)
Popular in	December
Cheapest in	March
Average price	$496
Good round-trip deal	$354 or less
Good one-way deal	$241 or less

Provider with most accurate pricing for Boston Logan Intl-Seattle/Tacoma Intl flight deals.

Search Deals

Provider most trusted by Cheapflights users for Boston Logan Intl-Seattle/Tacoma Intl flights.

Search Deals

From Boston Logan Intl to Seattle/Tacoma Intl

Search Deals

One-way flight from Boston Logan Intl to Seattle/Tacoma Intl

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($34 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Price to beat on a round-trip flight from Boston Logan Intl to Seattle/Tacoma Intl.

Search Deals

Price to beat on a one-way flight from Boston Logan Intl to Seattle/Tacoma Intl.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Thu 1/8

6:45 pm-10:13 pm

Nonstop6h 28m

Seattle/Tacoma Intl

Mon 1/12

10:25 pm-6:50 am

Nonstop5h 25m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Mon 3/9

6:24 pm-10:00 pm

Nonstop6h 36m

Seattle/Tacoma Intl

Wed 4/1

3:35 pm-11:54 pm

Nonstop5h 19m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 3/10

11:10 am-2:29 pm

Nonstop6h 19m

Seattle/Tacoma Intl

Thu 4/2

3:43 pm-11:59 pm

Nonstop5h 16m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 2/28

6:24 pm-10:00 pm

Nonstop6h 36m

Seattle/Tacoma Intl

Mon 3/2

10:40 pm-6:54 am

Nonstop5h 14m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 2/28

7:15 am-10:45 am

Nonstop6h 30m

Seattle/Tacoma Intl

Mon 3/2

10:20 pm-6:50 am

Nonstop5h 30m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 1/21

6:44 pm-10:17 pm

Nonstop6h 33m

Seattle/Tacoma Intl

Wed 1/28

7:55 am-4:20 pm

Nonstop5h 25m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 1/10

6:45 pm-10:13 pm

Nonstop6h 28m

Seattle/Tacoma Intl

Tue 1/20

7:40 am-4:09 pm

Nonstop5h 29m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Mon 3/9

6:42 pm-10:03 pm

Nonstop6h 21m

Seattle/Tacoma Intl

Thu 4/2

3:43 pm-11:59 pm

Nonstop5h 16m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 3/7

6:57 pm-10:25 pm

Nonstop6h 28m

Seattle/Tacoma Intl

Tue 3/31

7:20 am-3:43 pm

Nonstop5h 23m

$307

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Fri 1/30

6:45 pm-10:13 pm

Nonstop6h 28m

Seattle/Tacoma Intl

Sat 2/7

10:25 pm-6:50 am

Nonstop5h 25m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/8

Showing 1-10 of 22 results

Compare providers for flights from Boston to Seattle

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Seattle in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
CheapTicketsDeal	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Trip.com	Price Accuracy2 stars	Trust Score*3 stars
Cheapfaremart	Price Accuracy-	Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Boston-Seattle flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Boston-Seattle flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Boston-Seattle flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Boston-Seattle flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Boston to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Boston with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Seattle

Prices

Airlines

Delays

How far ahead should I book a flight from Boston to Seattle?

The price you pay for your flight from Boston to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 35 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Boston to Seattle?

Currently, January is the cheapest month in which you can book a flight from Boston to Seattle (average of $98). Flying from Boston to Seattle in December is currently the most expensive (average of $192). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOS to SEA?

One of the essential ways to save on airfare from Boston to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 33% on airfare.

What is the cheapest day to fly from Boston to Seattle?

Travelers seeking maximum savings on their Boston to Seattle flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Boston to Seattle flights

Cheapflights partnered with top experts to bring you the best recommendations for your Boston to Seattle trip

Airports

BOS

Use the FlyLogan App to pre-order food and save time at BOS. Most eateries participate, making it a convenient option.

SEA

Take the Link light rail from SEA to downtown Seattle. It's affordable, runs every 10 minutes, and takes less than 40 minutes.

Our travel experts

Paul Rubio

Expert on BOS

Brandon Schultz

Expert on SEA

Reviews of airlines servicing Seattle

Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Boston to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

11,423 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Alaska Airlines

8.0

Very good

11,423 reviews

Alaska Airlines

8.0

Very good

11,423 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Delta

7.9

Good

8,007 reviews

Alaska Airlines

8.0

Very good

11,423 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Hawaiian Airlines

7.8

Good

2,818 reviews

Alaska Airlines

8.0

Very good

11,423 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

American Airlines

7.2

Good

11,048 reviews

Alaska Airlines

8.0

Very good

11,423 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

JetBlue

7.2

Good

2,899 reviews

Alaska Airlines

8.0

Very good

11,423 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

What airports do I use to fly from Boston to Seattle?
You will need to book a flight from Boston Logan Intl to Seattle/Tacoma Intl if you want to fly from Boston to Seattle. At least 8 different airlines have flights from Logan Intl (BOS) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 22 flights to Seattle from the Boston airport per day. If you manage to book one that is nonstop, then you can expect the flight time from BOS to SEA to be around 6h 15m.
How popular is this Boston to Seattle flight route?
Flights from Boston Logan Intl to Seattle/Tacoma Intl have been viewed 49 times in the past calendar month.
How long is the flight from Boston to Seattle?
Departing from Boston to Seattle will take you 6h 28m. The distance between Boston and Seattle is about 2487 mi. Generally, flights for this route are nonstop.
What are the cheapest airlines flying from Boston to Seattle round-trip?
According to our current data, JetBlue ($118), Hawaiian Airlines ($125), and Delta ($127) offers the cheapest pricing from Boston to Seattle. These flights start at 67% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Boston to Seattle one-way?
One-way options have recently been found by users for as low as $98 on American Airlines. Other airlines that offer cheap prices include JetBlue from $107 and Alaska Airlines from $108 one-way.
What are the most reliable airlines from Boston to Seattle?
Consider TAP AIR PORTUGAL (100%), Japan Airlines (88%) or LATAM Airlines (88%) when booking your flight. These represent the most reliable airlines when flying from Boston to Seattle.
What are the cheapest flights from Boston to Seattle?
On average you can expect to pay $996 for a flight from Boston to Seattle. The cheapest flight overall is $153 while the most popular route, (Boston Logan Intl - Seattle/Tacoma Intl) is currently priced at $257.
Can I find deals for flights from Boston to Seattle that include hotel bookings?
Yes. In addition to deals on Boston to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Boston to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Seattle.
Can I find deals for business class flights from Boston to Seattle?
Yes. Cheapflights offers flight deals from Boston to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Boston to Seattle?
Currently, January is the cheapest month in which you can book a flight from Boston to Seattle (average of $98). Flying from Boston to Seattle in December is currently the most expensive (average of $192). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Tacoma

SeaTac

Lakewood

Olympia

Ocean Shores

Edmonds

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Puyallup

Kirkland

Tukwila

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Fife

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Shoreline

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Alternative routes for Boston to Seattle

Complete your trip

Seattle car rentals

Seattle/Tacoma Intl Airport car rentals

Kenmore Air Harbor Airport car rentals

Spokane car rentals

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Downtown car rentals

Capitol Hill car rentals

West Seattle car rentals

Queen Anne car rentals

Other flights to Seattle

Top 8 airlines flying from Boston to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Hawaiian Airlines	Cheapest$139	Average$361	FlexibilityNo cancel fee	On-time85%
JetBlue	Cheapest$142	Average$333	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$156	Average$370	FlexibilityNo cancel fee	On-timeN/A
Sun Country Air	Cheapest$167	Average$399	FlexibilityNo cancel fee	On-time83%
Alaska Airlines	Cheapest$230	Average$414	FlexibilityNo cancel fee	On-time75%
American Airlines	Cheapest$249	Average$466	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$250	Average$372	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$259	Average$390	FlexibilityNo cancel fee	On-time63%

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$154+ Cheap flights from Boston to Seattle (BOS - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/13. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Boston to Seattle with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Boston Logan Intl to Seattle/Tacoma Intl are usually found in March or January, booked 35 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Boston to Seattle

Cheapest flights from Boston to SeattleExplore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

Explore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

Find flight deals from Boston to Seattle

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to Seattle that are best for you.

Compare providers for flights from Boston to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Seattle in December.

Best time to book a flight from Boston to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Boston with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Boston to Seattle

How far ahead should I book a flight from Boston to Seattle?

What is the cheapest month to book a flight from Boston to Seattle?

What is the cheapest time of day to fly from BOS to SEA?

What is the cheapest day to fly from Boston to Seattle?

Weekly flight availability from Boston to Seattle

How often are flights from Boston to Seattle delayed?

What is the most punctual flight time for Boston to Seattle flights?

What day of the week experiences the fewest flight delays on this route?

Which airline has the best punctuality record on Boston to Seattle flights?

The best insider tips for Boston to Seattle flights

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Reviews of airlines servicing Seattle

Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Boston to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Boston to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airports do I use to fly from Boston to Seattle?

How popular is this Boston to Seattle flight route?

How long is the flight from Boston to Seattle?

What are the cheapest airlines flying from Boston to Seattle round-trip?

What are the cheapest airlines to fly from Boston to Seattle one-way?

What are the most reliable airlines from Boston to Seattle?

What are the cheapest flights from Boston to Seattle?

Can I find deals for flights from Boston to Seattle that include hotel bookings?

How can I find direct flights from Boston to Seattle?

Can I find deals for business class flights from Boston to Seattle?

What is the cheapest month to book a flight from Boston to Seattle?

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Alternative routes for Boston to Seattle

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Top 8 airlines flying from Boston to Seattle

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Cheapest flights from Boston to Seattle
Explore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.