Find Cheap Flights from Seattle/Tacoma Intl to Boston Logan International (SEA - BOS)

Search hundreds of travel sites at once for deals on flights to Boston Logan International

Wed 1/17
Wed 1/24
Any month
Compare vs. KAYAK |

Good to Know

Low Season:
February
Best time to beat the crowds
3%
expected price decrease
High Season:
July
Most popular time to fly
19%
expected price increase
Average Price:
$402
(avg. price over the last 2 weeks)
Good Deal:
$268
or less (round trip)

When to Book Flights from Seattle/Tacoma Intl to Boston Logan International

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $268 or less.
The cheapest flight from Seattle/Tacoma Intl to Boston Logan International was found 28 days before departure, on average.
Book at least 2 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is February.
Morning departure is around 5% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Seattle/Tacoma Intl to Boston Logan International Flights

How long does a flight from Seattle/Tacoma Intl to Boston Logan International take?
An average nonstop flight takes 5h 10m, covering a distance of 2488 miles.
How many flights are there between Seattle/Tacoma Intl and Boston Logan International?
There are 138 (nonstop) flights between Seattle/Tacoma Intl and Boston Logan International per week, averaging 20 per day.
Which airlines provide the cheapest flights from Seattle/Tacoma Intl to Boston Logan International?
In the past 3 days, the cheapest round-trip tickets were found on JetBlue ($197), Alaska Airlines ($243) and Delta ($250).
Do I need a passport to fly between Seattle/Tacoma Intl and Boston Logan International?
No.
Which airlines fly most frequently between Seattle/Tacoma Intl and Boston Logan International?
Alaska Airlines (3 times daily), JetBlue (3 times daily), Delta (3 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Seattle/Tacoma Intl to Boston Logan International?
For Seattle/Tacoma Intl to Boston Logan International, Monday is the cheapest day to fly on average and Thursday is the most expensive. Flying from Boston Logan International back to Seattle/Tacoma Intl, the best deals are generally found on Wednesday, with Friday being the most expensive.

Book cheap flights from Seattle/Tacoma Intl to Boston Logan International (round-trip)

Airports
Origin
Seattle
$197
only
$197
Destination
Boston
$197
only
$197
Mon, Jan 22
SEA
BOS
5h 10m
Fri, Jan 26
BOS
SEA
6h 28m
Trip: 5 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 35 reviews
Overall
8.2
Boarding
8.2
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
SEA
BOS
Excellent 8.0

It would have been nicer to be able to check my baggage at no extra fee

JFK
TPA
Excellent 8.0

My child had a very good escorted flight the attendants were very attentive and knowledgeable of my child's needs I highly recommend and if anyone needs an escorted flight they definitely will not regret it

All was good

SEA
BOS
Good 7.6

Nice crew!

Flew first class from SeaTac to Boston (5.5 hours) and got a tiny bag of cheese its and a vodka right after take off (midnight). Would have been nice to have one more round of drinks before landing (maybe coffee?) at 8am in Boston? maybe food for the long flight since most places to get food in the airport are closed by the time I checked in.

ORD
BOS
Good 6.0

Turbulence was terrible, understand that is not JetBlue issue - wanted to note.

SEA
BOS
Excellent 8.0

It took rather long for the luggage to come out, longer than the last few international trips I have been on.

Sat, Mar 3
SEA
BOS
5h 15m
Tue, Mar 6
BOS
SEA
6h 48m
Trip: 4 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 111 reviews
Overall
8.6
Boarding
8.7
Comfort
8.4
Crew
8.9
Entertainment
7.9
Food
8.0
SEA
BOS
Excellent 9.3

Boston landed at Gates C Run to catch flight at Gate 'N" Stupid....but who gives a shi***** right?

SEA
BOS
Excellent 8.0

The crew

SEA
BOS
Excellent 8.6

Seats

Breakfast

SEA
BOS
Excellent 9.0

I missed my flight, but staff in Seattle helped me get on the next one with minimal fuss. Not sure if this is always the case, but very pleased with a situation that could have been very stressful.

SEA
BOS
Good 6.0

flight was delayed and crew kept us informed at all times with clear explanations

didn't know about wi-fi entertainment until i was on the flight, and then i couldn't get the app.

Fri, Mar 2
SEA
BOS
5h 25m
Tue, Mar 6
BOS
SEA
6h 15m
Trip: 5 days
8.9ExcellentShow reviews
Overall 8.9 Excellent
Based on 10 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
SAN
LAX
Excellent 10.0

on time

YUL
DTW
Mediocre 2.0

Not applied

Not applied

MSY
JFK
Excellent 10.0

The overhead bin did not stay down low enough so that I could place my bag in. It would lower then before I could place my bag raise slightly by a few inches. For someone of my height (5’5”) that was problematic. Fortunately another passenger saw my dilemma and held the bin lower to its full opening capacity. This also momentarily slowed down the boarding process.

SEA
BOS
Excellent 10.0

Free entertainment and free food was unexpected and very welcomed, especially given the trend of charging for more and more features.

SEA
BOS
Excellent 9.0

Free lunch and free entertainment, who could ask for anything more.

Tue, Mar 6
SEA
BOS
5h 15m
Wed, Mar 14
BOS
SEA
6h 17m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Apr 3
SEA
BOS
8h 27m
Wed, Apr 4
BOS
SEA
12h 39m
Trip: 2 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 27225 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
FLL
DFW
Excellent 10.0

Great service

MXP
JFK
Okay 5.0

i had a really horrible experience with a flight attendent but the 2 in my cabin were great. Earphones didnt work and couldnt see screen

PHL
LHR
Good 7.3

Range of entertainment options, one crew member was terrific

Comfort of bed, some crew members snarky, old aircraft

BNA
LAX
Excellent 10.0

The service from the flight attendants on the flight was absolutely amazing

DFW
COS
Excellent 10.0

Great service

Thu, Feb 1
SEA
BOS
5h 10m
Mon, Feb 5
BOS
SEA
6h 28m
Trip: 5 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 35 reviews
Overall
8.2
Boarding
8.2
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
JFK
TPA
Excellent 8.0

My child had a very good escorted flight the attendants were very attentive and knowledgeable of my child's needs I highly recommend and if anyone needs an escorted flight they definitely will not regret it

All was good

BNA
FLL
Good 7.0

Every single employee I interacted with was awesome.

Over 5 hours in delay due to a maintenance issue. Problem wasn't discovered overnight when it was parked. Wasn't discovered until the next day. Had to wait for the delivery of a specific part and install it. I'm all for planes not breaking upon reentry, but the fact that the two flights were both subsequently delayed 4-5 hours each instead of bringing in a sub plane was inconsiderate. Now I've got a long drive home and I'll only get an hour of sleep before a 14-hour work day. So thanks for that, JetBlue

SEA
BOS
Good 7.6

Nice crew!

Flew first class from SeaTac to Boston (5.5 hours) and got a tiny bag of cheese its and a vodka right after take off (midnight). Would have been nice to have one more round of drinks before landing (maybe coffee?) at 8am in Boston? maybe food for the long flight since most places to get food in the airport are closed by the time I checked in.

SEA
BOS
Excellent 8.0

It would have been nicer to be able to check my baggage at no extra fee

SEA
BOS
Excellent 9.3

I loved everything about Jet Blue! Crew was very friendly, the cabin was clean, the seats were very roomy and comfortable, the snack choices were great...it was my first time flying an airline other than Alaska and I was genuinely impressed. I'd definitely fly Jet Blue again!

The sound quality on my video screen was horrible and there was lots of flickering of the screen...but, hey, who cares? :)

Wed, Feb 21
SEA
BOS
5h 10m
Mon, Feb 26
BOS
SEA
6h 28m
Trip: 6 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 35 reviews
Overall
8.2
Boarding
8.2
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
SEA
BOS
Good 7.6

Nice crew!

Flew first class from SeaTac to Boston (5.5 hours) and got a tiny bag of cheese its and a vodka right after take off (midnight). Would have been nice to have one more round of drinks before landing (maybe coffee?) at 8am in Boston? maybe food for the long flight since most places to get food in the airport are closed by the time I checked in.

ORD
BOS
Good 6.0

Turbulence was terrible, understand that is not JetBlue issue - wanted to note.

SEA
BOS
Excellent 8.0

It would have been nicer to be able to check my baggage at no extra fee

BNA
FLL
Good 7.0

Every single employee I interacted with was awesome.

Over 5 hours in delay due to a maintenance issue. Problem wasn't discovered overnight when it was parked. Wasn't discovered until the next day. Had to wait for the delivery of a specific part and install it. I'm all for planes not breaking upon reentry, but the fact that the two flights were both subsequently delayed 4-5 hours each instead of bringing in a sub plane was inconsiderate. Now I've got a long drive home and I'll only get an hour of sleep before a 14-hour work day. So thanks for that, JetBlue

SEA
BOS
Excellent 9.3

I loved everything about Jet Blue! Crew was very friendly, the cabin was clean, the seats were very roomy and comfortable, the snack choices were great...it was my first time flying an airline other than Alaska and I was genuinely impressed. I'd definitely fly Jet Blue again!

The sound quality on my video screen was horrible and there was lots of flickering of the screen...but, hey, who cares? :)

Wed, Mar 7
SEA
BOS
5h 10m
Tue, Mar 13
BOS
SEA
6h 17m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Apr 3
SEA
BOS
8h 30m
Tue, Apr 10
BOS
SEA
10h 42m
Trip: 8 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 27225 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PHL
ORD
Mediocre 2.0

The baggage customer service said the crew will wait for us, but they never did. THANKS for NOTHING!

MAD
PHL
Good 7.0

We shopped price, this was the most affordable flight for us.

Getting seat reservations should be easier and sooner.

PHL
LHR
Good 7.3

Range of entertainment options, one crew member was terrific

Comfort of bed, some crew members snarky, old aircraft

FCO
PHL
Okay 4.3

Not much.

The flight was late due to maintenance and caused us to miss our connecting flight to Chicago. American Airlines customer assistance at the airport was absolutely terrible. They were rude and inconsiderate as they kept suggesting to fly standby. We shouldn't have to fly standby when it wasn't our fault why were late. They told us our bags would be ok going to Chicago and they we would make the flight, but we did not. I do not know why didn't wait for us considering there were 8 others that also missed the connecting flight. We had to fly to Denver and stay overnight with no luggage and catch a 7:00am flight to Chicago. The last surprise I received was my damaged bag when I got back to Chicago. Thank you for making this trip memorable in a terrible way. I will never book or recommend Kayak or use American Airlines again.

DFW
COS
Excellent 10.0

Great service

Fri, Jun 1
SEA
BOS
8h 35m
Wed, Jun 6
BOS
SEA
6h 20m
Trip: 6 days
8.9ExcellentShow reviews
Overall 8.9 Excellent
Based on 10 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
SEA
BOS
Excellent 10.0

Free entertainment and free food was unexpected and very welcomed, especially given the trend of charging for more and more features.

YUL
DTW
Mediocre 2.0

Not applied

Not applied

SEA
ANC
Excellent 10.0

Alaska Airlines is way overpriced and way less comfortable than Delta. I’m a Delta loyalist forever now!

Nothing.

DEN
SLC
Excellent 10.0

Delta is great

SEA
BOS
Okay 4.6

After a grueling 14 hour flight back to the states from Asia, got notification that my Delta flight was further delayed an additional 3.5 hrs from the layover of 2hrs, so I was at the airport for a good part of the day and did not get home till midnight. Altogether 24+ hrs of no real sleep. To add insult to injury, a Delta representative called and apologized, offering a $100 voucher or gift certificate. Raised expectation that they might actually do the right thing. I then received a Delta email that says "Your day just got better", except there was nothing but ads and enter to bid for things. Overall bad experience when I really needed them to get me home on time.

Thu, Jan 18
SEA
BOS
7h 27m
Mon, Jan 22
BOS
SEA
6h 35m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Thu, May 31
SEA
BOS
5h 25m
Mon, Jun 4
BOS
SEA
6h 20m
Trip: 5 days
8.9ExcellentShow reviews
Overall 8.9 Excellent
Based on 10 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
SYR
JFK
Good 7.0

Nothing Special

YUL
DTW
Mediocre 2.0

Not applied

Not applied

SEA
BOS
Excellent 9.3

Delayed flight so water and snacks distributed before the flight

No issues

SEA
BOS
Okay 4.6

After a grueling 14 hour flight back to the states from Asia, got notification that my Delta flight was further delayed an additional 3.5 hrs from the layover of 2hrs, so I was at the airport for a good part of the day and did not get home till midnight. Altogether 24+ hrs of no real sleep. To add insult to injury, a Delta representative called and apologized, offering a $100 voucher or gift certificate. Raised expectation that they might actually do the right thing. I then received a Delta email that says "Your day just got better", except there was nothing but ads and enter to bid for things. Overall bad experience when I really needed them to get me home on time.

LAX
CUN
Mediocre 2.6

Terrible customer service both on the phone before the flight, but Especially from the gate agent. Wow she was really horrible.

The flight attendants on board were good! They helped get everything straight. Easily could have been handled by the incompetent gate agent. Wow.

Wed, Mar 28
SEA
BOS
5h 15m
Fri, Apr 6
BOS
SEA
6h 17m
Trip: 10 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 35 reviews
Overall
8.2
Boarding
8.2
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
ORD
BOS
Good 6.0

Turbulence was terrible, understand that is not JetBlue issue - wanted to note.

SEA
BOS
Good 7.0

My experience was definitely improved because I happened to be traveling with my elderly mother, who needed wheelchair assistance. Thanks to her, we boarded early and had aisle seats near the front.

My tray table was broken. I'm tired of the same unimaginative snack choices.

SEA
BOS
Good 7.6

Nice crew!

Flew first class from SeaTac to Boston (5.5 hours) and got a tiny bag of cheese its and a vodka right after take off (midnight). Would have been nice to have one more round of drinks before landing (maybe coffee?) at 8am in Boston? maybe food for the long flight since most places to get food in the airport are closed by the time I checked in.

SEA
BOS
Good 7.3

Friendly flight attendants

Being delayed from taking off by 2 hours in an airport that had very few restaurants near the gate that were open.

JFK
TPA
Excellent 8.0

My child had a very good escorted flight the attendants were very attentive and knowledgeable of my child's needs I highly recommend and if anyone needs an escorted flight they definitely will not regret it

All was good

Tue, May 8
SEA
BOS
5h 21m
Tue, May 15
BOS
SEA
6h 20m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Jul 5
SEA
BOS
5h 17m
Wed, Jul 11
BOS
SEA
6h 34m
Trip: 7 days
8.9ExcellentShow reviews
Overall 8.9 Excellent
Based on 10 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
DEN
SLC
Excellent 10.0

Delta is great

SEA
ANC
Excellent 10.0

Alaska Airlines is way overpriced and way less comfortable than Delta. I’m a Delta loyalist forever now!

Nothing.

SYR
JFK
Good 7.0

Nothing Special

SAN
LAX
Excellent 10.0

on time

SEA
BOS
Excellent 8.0

The tsa is worthless

Tue, May 1
SEA
BOS
5h 15m
Sat, May 5
BOS
SEA
6h 07m
Trip: 5 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 35 reviews
Overall
8.2
Boarding
8.2
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
PBI
HPN
Excellent 10.0

Up to expectation; on time, smooth check in with kiosk, efficient and courteous TSA security line, clear navigational sign, bookstore, clean windows, clean seat, and clean air.

waiting area after security checkpoint is a little too tight at West Palm Beach International Airport.

SEA
BOS
Good 7.6

Nice crew!

Flew first class from SeaTac to Boston (5.5 hours) and got a tiny bag of cheese its and a vodka right after take off (midnight). Would have been nice to have one more round of drinks before landing (maybe coffee?) at 8am in Boston? maybe food for the long flight since most places to get food in the airport are closed by the time I checked in.

JFK
TPA
Excellent 8.0

My child had a very good escorted flight the attendants were very attentive and knowledgeable of my child's needs I highly recommend and if anyone needs an escorted flight they definitely will not regret it

All was good

SEA
BOS
Excellent 8.0

It took rather long for the luggage to come out, longer than the last few international trips I have been on.

SEA
BOS
Good 7.3

Friendly flight attendants

Being delayed from taking off by 2 hours in an airport that had very few restaurants near the gate that were open.

Tue, Jun 5
SEA
BOS
5h 13m
Tue, Jun 12
BOS
SEA
6h 24m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jul 31
SEA
BOS
7h 05m
Tue, Aug 14
BOS
SEA
6h 24m
Trip: 15 days
Overall 0.0 Poor
Based on 0 reviews
Show more results
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

^
The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.

Seattle/Tacoma Intl to Boston Logan International Flight Information

Avg. Flight Duration 5h 49m
Flights Arrive in Boston Logan International
Flights Depart from Seattle/Tacoma Intl
Flight Price $197
Distance 2488 miles
Airlines JetBlue, Alaska Airlines, Delta, American Airlines