Cheap flights from Seattle to Boston

Round-trip
Economy
Seattle (SEA)
Boston (BOS)
Depart
Return
Any month
Compare vs. Cheapflights |

The best prices from Seattle to Boston are usually found in January or February, booked 60 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

How to find the cheapest flight from
Seattle (SEA) to Boston (BOS)

All the information you need to plan the best SEA to BOS flight in 2021: compare Seattle to Boston flight prices with the expected peak season, weather and rainfall in Boston.
SEA - BOS
Price
C$ 260 - C$ 563
BOS
Temperature
4 - 29 °C
BOS
Rainfall
70 - 99 mm

Popular in

December

High demand for flights, 35% potential price rise

Cheapest in

January

Best time to find cheap flights, 29% potential price drop

Round-trip from

C$ 260

From Seattle to Boston

One-way from

C$ 177

One-way flight from Seattle to Boston

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Seattle to Boston?

Thursday flights are found to be more expensive to fly from Seattle to Boston. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Boston.

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

Travellers have found it’s best to book a flight 33 days in advance to save up to 92% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 33 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Seattle to Boston 1-2 weeks in advance for as low as C$ 440, or C$ 610 for flights within the next 24 hours.

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

March can be a great time to fly to Boston from Seattle with a flight ticket averaging about C$ 328. Cheapflights users have found deals in the month of March for as cheap as C$ 255. The most expensive prices can be found in the month of December.

When is the cheapest time to fly from Seattle to Boston (SEA - BOS)?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 43% on flights from Seattle to Boston by exploring options for tickets at noon.

Cheap flights from Seattle to Boston in July, August 2021

The best prices found for SEA to BOS flights for July, August
30 Aug - 4 Sep
C$ 358pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
31 Aug - 5 Sep
C$ 396pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
31 Aug - 5 Sep
C$ 422pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
Direct
SEA
Seattle/Tacoma Intl

Seattle to Boston 2021 flight deals

Cheap flights to Boston from Seattle found for this year
14 Sep - 21 Sep
C$ 237pp
SEA
Seattle/Tacoma Intl
Spirit Airlines
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Spirit Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
15 Sep - 20 Sep
C$ 246pp
SEA
Seattle/Tacoma Intl
Spirit Airlines
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Spirit Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
17 Sep - 20 Sep
C$ 255pp
SEA
Seattle/Tacoma Intl
Spirit Airlines
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Spirit Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Direct flights to Boston from Seattle

Save time with Seattle to Boston direct flight deals
19 Oct - 21 Oct
C$ 298pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
23 Oct - 27 Oct
C$ 310pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
21 Oct - 22 Oct
C$ 316pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Boston

Late deals on round-trip flights to Boston from Seattle, departing today and this week
2 Aug - 27 Aug
C$ 555pp
SEA
Seattle/Tacoma Intl
JetBlue
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
JetBlue
 
1 STOP
SEA
Seattle/Tacoma Intl
2 Aug - 27 Aug
C$ 637pp
SEA
Seattle/Tacoma Intl
JetBlue
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
JetBlue
Direct
SEA
Seattle/Tacoma Intl
4 Aug - 18 Aug
C$ 706pp
SEA
Seattle/Tacoma Intl
JetBlue
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
JetBlue
 
1 STOP
SEA
Seattle/Tacoma Intl

One-way flights to Boston from Seattle

The cheapest one-way flights from Seattle to Boston
10:00 a.m. - 2:29 a.m.
Spirit Airlines
1 stop
13h 29m
SEA - BOS
Spirit Airlines
C$ 178
Spirit
11:37 a.m. - 7:59 p.m.
Alaska Airlines
Direct
5h 22m
SEA - BOS
Alaska Airlines
C$ 250
5:49 a.m. - 8:31 p.m.
Delta
1 stop
11h 42m
SEA - BOS
Delta
C$ 287
Delta

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Seattle</span> to <span class="emphasized">Boston</span> flights.

Flight FAQs

From Seattle to Boston

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

Booking a flight from Seattle/Tacoma Intl (SEA) to Boston Logan Intl (BOS) is your only option if you wish to fly from Seattle to Boston. On a typical day, there are 14 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 27m for a nonstop flight. You can also purchase a plane ticket from 4 airlines when you book a flight from Seattle/Tacoma Intl to Boston.

What safety measures are being taken by airlines flying from Seattle/Tacoma Intl to Boston Logan Intl to control the spread of COVID-19?

New policies can now be found on Alaska Airlines to help keep travellers safe while flying. Airline carriers are regularly disinfecting and sanitizing their aircraft. Masks are provided and are mandatory while on board. Pre-flight testing for symptoms and antibodies, alongside socially-distanced seating (for a limited time) will work towards keeping travellers safer while flying from Seattle/Tacoma Intl to Boston Logan Intl. Policies will vary by airline.

Which airlines flying from Seattle/Tacoma Intl to Boston Logan Intl have flexible cancellations due to COVID-19?

Some of the carriers operating flights from Seattle/Tacoma Intl to Boston Logan Intl that may be offering flexible cancellation policies are JetBlue, Alaska Airlines, and Delta. Our site will let you filter for all airlines offering greater flexibility due to COVID-19.

Can I find flights from Seattle to Boston for under C$ 251 on Cheapflights?

Yes, there are multiple flights from Seattle to Boston for under C$ 251. The cheapest flight booked recently is on Spirit Airlines for just C$ 237, but on average you can expect to pay C$ 306.

Are there direct flights from Seattle to Boston for under C$ 377 on Cheapflights?

Cheapflights has 20 direct flights from Seattle to Boston under C$ 377. A good price for a direct flight from Seattle to Boston is less than C$ 381.

Are there last-minute flights available from Seattle to Boston for under C$ 628?

There are currently 20+ open flights from Seattle to Boston within the next 7 days for less than C$ 628.

How popular is this flight route?

Within the past month, 28 users have taken a look at flights from Seattle/Tacoma Intl to Boston Logan Intl.

Does it rain more in Seattle or Boston?

When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Seattle is roughly less than Boston. You can assume this to be the case over the next 9 days.

Is Seattle weather warmer or cooler than Boston?

Temperatures around the 29 °C's can be experienced in July. The weather in Boston is hotter than in Seattle. Plan for potential changes in flight availability as peak weather approaches in this location.

How long is the flight from Seattle to Boston?

A quick flight from Seattle to Boston can take about 5h 12m. JetBlue provides one of the quickest options available for as low as C$ 367. Generally, flights for this route are direct.

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

Spirit Airlines, at C$ 237, was found to be the cheapest airline from Seattle to Boston.Alternate airlines to your destination round-trip include Alaska Airlines and Delta. You may be able to fly from Seattle to Boston for 35% less than the average price by searching for these airlines.

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

To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at C$ 119. Delta flights start at C$ 149 while deals on Alaska Airlines start at C$ 162 one-way.

Destination information for Boston

Things to know before you go - useful duration and weather info for your trip from Seattle to Boston.
Flight duration
5h 49m
Average temperature for July in Boston
29.0 °C
Avg rainfall for July in Boston
81.0 mm

Airports servicing Seattle

Airports servicing Boston

Top 4 airlines flying from Seattle to Boston

The chart below displays the airlines Cheapflights users travelling from Seattle to Boston choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Delta
C$ 118 C$ 226 No cancel fee N/A
Search Delta flights
American Airlines
C$ 117 C$ 240 No cancel fee 71%
Search American Airlines flights
Alaska Airlines
C$ 118 C$ 288 No cancel fee 75%
Search Alaska Airlines flights
JetBlue
C$ 156 C$ 391 No cancel fee 62%
Search JetBlue flights

Hourly flight availability from Seattle to Boston

See what time of day planes typically take off from Seattle towards Boston.
Afternoon Noon to 6 PM 47% of flight departures
Morning 6 AM to noon 27% of flight departures
Evening 6 PM to midnight 23% of flight departures
Early morning Midnight to 6 AM 3% of flight departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Boston
See how many times per day planes take to the skies headed from Seattle to Boston.
Sunday
17 daily flights
Monday
13 daily flights
Tuesday
12 daily flights
Wednesday
9 daily flights
Thursday
16 daily flights
Friday
18 daily flights
Saturday
15 daily flights
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