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

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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:
C$ 489
(avg. price over the last 2 weeks)
Good Deal:
C$ 350
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 C$ 349 or less.
The cheapest flight from Seattle/Tacoma Intl to Boston Logan International was found, on average, 28 days before departure.
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.
On average*, there is no price difference when choosing to fly in the morning or the evening on this flight route.
*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 4004 km.
How many flights are there between Seattle/Tacoma Intl and Boston Logan International?
There are 167 (nonstop) flights between Seattle/Tacoma Intl and Boston Logan International per week, averaging 23 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 Multiple Airlines (C$ 291), JetBlue (C$ 291) and Spirit Airlines (C$ 375).
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 (7 times daily), JetBlue (4 times daily), Delta (3 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly from Seattle/Tacoma Intl to Boston Logan International?
For Seattle/Tacoma Intl to Boston Logan International, Saturday is the cheapest day to fly on average and Tuesday 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
C$ 291
only
C$ 291
Destination
Boston
C$ 291
only
C$ 291
Sat, 6 Jan
SEA
BOS
5h 13m
Tue, 9 Jan
BOS
SEA
6h 43m
C$ 291
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Sat, 3 Feb
SEA
BOS
5h 10m
Sat, 10 Feb
BOS
SEA
6h 28m
C$ 291
Trip: 8 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 32 reviews
Overall
8.2
Boarding
8.3
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
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.

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

MCO
PVD
Excellent 10.0

Great flight great experience

Long lines at TSA checkpoint.

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? :)

Sun, 24 Dec
SEA
BOS
17h 59m
Thu, 4 Jan
BOS
SEA
28h 04m
C$ 375
Trip: 12 days
5.4OkayShow reviews
Overall 5.4 Okay
Based on 51220 reviews
Overall
5.6
Boarding
6.0
Comfort
5.3
Crew
6.4
Entertainment
4.5
Food
4.6
RSW
DTW
Excellent 8.0

The flight was delayed for a "maintenance issue," but that's fine by me - I'm glad they are checking planes thoroughly before take-off. They got us out of the gate faster than predicted, and everything went fine from there.

The flight was delayed for a "maintenance issue," but that's fine by me - I'm glad they are checking planes thoroughly before take-off. They got us out of the gate faster than predicted, and everything went fine from there.

LAS
CLE
Good 7.6

I wish Spirit would be more environmentally conscious and stop using styrofoam cups, plus in general strive to reduce the amount of waste produced in their food service.

BDL
TPA
Okay 5.0

Flight not full and they still jammed people 3 to a row. Web site confusing and difficult to use, unable to get a real person on the phone for help. My cheap fare doubled at check in due to baggage charges that were not made clear in advance. No email confirmation of flight. I would not fly Spirit again despite the fare,

MCO
SJU
Excellent 10.0

Carry on bag fee

LAX
OAK
Excellent 10.0

Everything went smoothly.

Tue, 3 Apr
SEA
BOS
5h 25m
Tue, 10 Apr
BOS
SEA
6h 15m
C$ 416
Trip: 8 days
9.0ExcellentShow reviews
Overall 9.0 Excellent
Based on 9 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
ATL
DFW
Excellent 10.0

My entire flight experience was delightful. Was dry impressed with the staff both at Hartsfield-Jackson and DFW...and our flight crew was positively sublime.

SEA
BOS
Excellent 9.3

Delayed flight so water and snacks distributed before the flight

No issues

JFK
ATL
Excellent 8.3

We had the best flight attendant ever! Her name was Sharon on Eandeavor / Delta Cnx, and she made the experience the best flight I've experienced. Thanks Sharon for being awesome!

window seat in back didn't have window

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.

JFK
MIA
Okay 5.3

Some of the flight attendants were rude and not very welcoming at all.

Thu, 11 Jan
SEA
BOS
5h 10m
Tue, 16 Jan
BOS
SEA
6h 43m
C$ 297
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Fri, 9 Feb
SEA
BOS
5h 15m
Sun, 11 Feb
BOS
SEA
6h 27m
C$ 304
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Wed, 18 Apr
SEA
BOS
5h 15m
Mon, 23 Apr
BOS
SEA
6h 26m
C$ 355
Trip: 6 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 32 reviews
Overall
8.2
Boarding
8.3
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
BOS
PBI
Excellent 8.3

my attendant

SEA
BOS
Excellent 8.0

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

SEA
BOS
Excellent 9.6

Unlimited snacks, leg room, free wifi

Screens are very small!

MCO
PVD
Excellent 10.0

Great flight great experience

Long lines at TSA checkpoint.

CHS
FLL
Okay 4.3

Boarding time and crew was slowest ever?!!!

Sun, 24 Dec
SEA
BOS
17h 59m
Sat, 6 Jan
BOS
SEA
6h 31m
C$ 331
Trip: 14 days
Overall 0.0 Poor
Based on 0 reviews
Tue, 15 May
SEA
BOS
5h 25m
Tue, 22 May
BOS
SEA
6h 20m
C$ 416
Trip: 8 days
9.0ExcellentShow reviews
Overall 9.0 Excellent
Based on 9 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
SEA
BOS
Excellent 9.3

Delayed flight so water and snacks distributed before the flight

No issues

LGA
ORD
Excellent 10.0

Flight was on time. Boarded quickly with no fuss.

SEA
BOS
Excellent 8.0

The tsa is worthless

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.

Wed, 2 May
SEA
BOS
5h 28m
Thu, 10 May
BOS
SEA
6h 11m
C$ 387
Trip: 9 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 32 reviews
Overall
8.2
Boarding
8.3
Comfort
8.3
Crew
8.6
Entertainment
8.0
Food
7.8
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.

CHS
FLL
Okay 4.3

Boarding time and crew was slowest ever?!!!

FLL
LAS
Good 6.3

The flight was delayed by 2 hours

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
Excellent 9.6

Unlimited snacks, leg room, free wifi

Screens are very small!

Tue, 5 Jun
SEA
BOS
5h 25m
Fri, 8 Jun
BOS
SEA
6h 34m
C$ 416
Trip: 4 days
9.0ExcellentShow reviews
Overall 9.0 Excellent
Based on 9 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
DEN
ATL
Excellent 8.6

On two of the legs of the trip they notice I was a tall person with long legs and upgraded me to seats with more leg room!! I didn't even ask. Thank you.

On the way back there were open seats with extra leg room and I asked the gate attendant if it was possible to switch my seat to one with more room and they said they only could if I paid extra.

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.

BWI
JFK
Mediocre 3.6

There was a change in our flight. According to Delta you didn't confirm every leg of our flight and the plane was over booked.

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.

JFK
ATL
Excellent 8.3

We had the best flight attendant ever! Her name was Sharon on Eandeavor / Delta Cnx, and she made the experience the best flight I've experienced. Thanks Sharon for being awesome!

window seat in back didn't have window

Mon, 18 Dec
SEA
BOS
7h 55m
Tue, 9 Jan
BOS
SEA
6h 27m
C$ 361
Trip: 23 days
Overall 0.0 Poor
Based on 0 reviews
Mon, 5 Mar
SEA
BOS
5h 18m
Sun, 18 Mar
BOS
SEA
6h 17m
C$ 416
Trip: 13 days
8.8ExcellentShow reviews
Overall 8.8 Excellent
Based on 32 reviews
Overall
8.2
Boarding
8.3
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

CHS
FLL
Okay 4.3

Boarding time and crew was slowest ever?!!!

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.

BOS
PBI
Excellent 8.3

my attendant

FLL
LAS
Good 6.3

The flight was delayed by 2 hours

Mon, 5 Mar
SEA
BOS
5h 25m
Fri, 9 Mar
BOS
SEA
6h 26m
C$ 402
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Tue, 12 Jun
SEA
BOS
10h 08m
Sun, 17 Jun
BOS
SEA
6h 34m
C$ 454
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
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*
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