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$ 152

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$ 611 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 April, May 2021

The best prices found for SEA to BOS flights for April, May
5 May - 6 May
C$ 271pp
SEA
Seattle/Tacoma Intl
Delta
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
5 May - 6 May
C$ 319pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
5 May - 19 May
C$ 323pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl

Seattle to Boston 2021 flight deals

Cheap flights to Boston from Seattle found for this year
17 Jun - 18 Jun
C$ 259pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
Direct
SEA
Seattle/Tacoma Intl
5 May - 6 May
C$ 271pp
SEA
Seattle/Tacoma Intl
Delta
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
5 May - 6 May
C$ 319pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl

Direct flights to Boston from Seattle

Save time with Seattle to Boston direct flight deals
5 May - 19 May
C$ 323pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
4 May - 10 May
C$ 339pp
SEA
Seattle/Tacoma Intl
Delta
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
Direct
SEA
Seattle/Tacoma Intl
6 May - 30 May
C$ 356pp
SEA
Seattle/Tacoma Intl
Delta
Direct
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
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
20 Apr - 8 May
C$ 465pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
Direct
SEA
Seattle/Tacoma Intl
20 Apr - 8 May
C$ 476pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
20 Apr - 7 May
C$ 481pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
BOS
Boston Logan Intl
BOS
Boston Logan Intl
Delta
Direct
SEA
Seattle/Tacoma Intl

One-way flights to Boston from Seattle

The cheapest one-way flights from Seattle to Boston
5:32 a.m. - 3:34 p.m.
Frontier
2 stops
31h 02m
SEA - BOS
Frontier
C$ 153
Kiwi.com
9:28 a.m. - 8:34 p.m.
American Airlines
1 stop
8h 06m
SEA - BOS
American Airlines
C$ 188
4:10 p.m. - 7:27 p.m.
Multiple Airlines
3 stops
24h 17m
SEA - BOS
Multiple Airlines
C$ 203
FlyFar

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

Can I find flights from Seattle to Boston for under C$ 377 on Cheapflights?

Yes, there are multiple flights from Seattle to Boston for under C$ 377. The cheapest flight booked recently is on Delta for just C$ 259, but on average you can expect to pay C$ 338.

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 and Delta 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.

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$ 383.

Are there last-minute flights available from Seattle to Boston for under C$ 503?

There are currently 20+ open flights from Seattle to Boston within the next 7 days for less than C$ 503.

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 similar to Boston. You can assume this to be the case over the next 20 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 09m. Alaska Airlines provides one of the quickest options available for as low as C$ 323. Both multi-stop and direct flights can be found to your destination and back.

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

Delta, at C$ 259, was found to be the cheapest airline from Seattle to Boston.Alternate airlines to your destination round-trip include Alaska Airlines and Sun Country Air. You may be able to fly from Seattle to Boston for 29% 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 Frontier, which is currently one of the cheapest options available, starting at C$ 153. Alaska Airlines flights start at C$ 163 while deals on United Airlines start at C$ 173 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 43m
Average temperature for April in Boston
15.0 °C
Avg rainfall for April in Boston
94.0 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.
Morning 6 AM to noon 50% of flight departures
Evening 6 PM to midnight 28% of flight departures
Afternoon Noon to 6 PM 21% of flight departures
Early morning Midnight to 6 AM 1% 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
8 daily flights
Monday
12 daily flights
Tuesday
9 daily flights
Wednesday
4 daily flights
Thursday
12 daily flights
Friday
8 daily flights
Saturday
9 daily flights
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