Return flight: Boston – Seattle

On Cheapflightsplus.com you will find 49 connecting flights from Seattle to Boston. You can compare airfare deals from 5 airlines and multiple travel sites from $172, book and save on cheap plane tickets and last minute offers. Also check out SEA-BOS flight schedule to find best flight time, convenient departure and arrival airports.

Find One-Way and Round-Trip Seattle to Boston Flight Deals

Cheapest flights in

october

: (no tickets).
One-way
Two-way
October
154 $
November
December
January
February
March
April
May
June
July
August
September
October
334 $
November
December
January
February
March
April
May
June
July
August
September

Flight Information

Below we will explain in detail what the flights cost on the destination from Seattle to Boston depends on and how to choose the most interesting flight option for you.

Distance between Seattle and Boston is 4005 miles. Time difference between the cities is 3h. Airplanes depart 00:59 to 23:59 from 3 Seattle airports and arrive 00:59 to 23:59 to 4 Boston airports. Average flight time is 14h 20m.

  • The fastest flight 7h 2m
  • Average flight time 14h 20m
  • Distance 2489 ml

The cheapest months to travel to Boston are october (from 172 $), may (from 172 $), june (from 172 $).

The most expensive months are july (from 278 $), august (from 173 $), september (from 173 $).

What is the lowest airfare Seattle to Boston?

The cheapest plane ticket found by our users is $172. This airfare is for economy class on one-way UA747 flight by United Airlines for October 3, 2025 which leaves Seattle-Tacoma Intl in Seattle at 23:54 am and arrives at Boston Logan at 09:56.

Economy class
$172
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Business class
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First class
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Flight Schedule Seattle (Washington) to Boston (Massachusetts)

06:12 — 08:11+2days
46h 59m flight time
Find flight
from$173
06:12 — 10:08 Seattle — Denver
F93406 Frontier Airlines
13h 51m stop
23:59 — 05:31 Denver — Tampa
F91114 Frontier Airlines
23h 30m stop
05:01 — 08:11 Tampa — Boston
F91216 Frontier Airlines
06:12 — 13:48+1day
28h 36m flight time
Find flight
from$213
06:12 — 10:08 Seattle — Denver
F93406 Frontier Airlines
13h 56m stop
00:04 — 05:44 Denver — Orlando
F91734 Frontier Airlines
4h 58m stop
10:42 — 13:48 Orlando — Boston
NK2178 Spirit Airlines
07:00 — 17:46
7h 46m flight time
Find flight
from$173
07:00 — 13:15 Seattle — Chicago
UA2618 United Airlines
1h stop
14:15 — 17:46 Chicago — Boston
UA664 United Airlines
11:11 — 21:55
7h 44m flight time
Find flight
from$267
11:11 — 14:58 Seattle — Denver
UA1049 United Airlines
57m stop
15:55 — 21:55 Denver — Boston
UA716 United Airlines
12:43 — 23:46
8h 3m flight time
Find flight
from$173
12:43 — 16:30 Seattle — Denver
UA1417 United Airlines
1h 13m stop
17:43 — 23:46 Denver — Boston
UA1691 United Airlines
14:00 — 00:45+1day
7h 45m flight time
Find flight
from$172
13:49 — 20:05 Seattle — Chicago
UA2665 United Airlines
1h stop
21:30 — 00:59 Chicago — Boston
UA1779 United Airlines
16:12 — 06:25+1day
11h 13m flight time
Find flight
from$272
16:12 — 19:03 Seattle — San Diego
HA6885 Hawaiian Airlines
2h 32m stop
21:35 — 06:25 San Diego — Boston
HA4849 Hawaiian Airlines
17:45 — 06:25+1day
9h 40m flight time
Find flight
from$209
17:45 — 20:38 Seattle — San Diego
HA6882 Hawaiian Airlines
57m stop
21:35 — 06:25 San Diego — Boston
HA4849 Hawaiian Airlines
17:45 — 06:25+1day
9h 40m flight time
Find flight
from$216
17:59 — 20:54 Seattle — San Diego
AS1098 Alaska Airlines
57m stop
22:45 — 07:30 San Diego — Boston
AS259 Alaska Airlines
19:30 — 06:00+1day
7h 30m flight time
Find flight
from$233
19:30 — 20:25 Seattle — Portland
HA6823 Hawaiian Airlines
1h 5m stop
21:30 — 06:00 Portland — Boston
HA6331 Hawaiian Airlines
20:31 — 22:47+1day
23h 16m flight time
Find flight
from$194
20:31 — 23:31 Seattle — Phoenix
F93974 Frontier Airlines
13h 56m stop
13:27 — 20:14 Phoenix — Detroit
NK1333 Spirit Airlines
35m stop
20:49 — 22:47 Detroit — Boston
NK2152 Spirit Airlines
23:16 — 07:43+2days
29h 27m flight time
Find flight
from$236
23:16 — 00:15 Seattle — Vancouver
AS2383 Alaska Airlines
9h 15m stop
09:30 — 17:24 Vancouver — Atlanta
WS1596 WestJet
11h 41m stop
05:05 — 07:43 Atlanta — Boston
F93512 Frontier Airlines
23:54 — 09:56+1day
7h 2m flight time
Find flight
from$172
23:50 — 05:53 Seattle — Chicago
UA747 United Airlines
36m stop
06:30 — 09:56 Chicago — Boston
UA2104 United Airlines
23:54 — 11:01+1day
8h 7m flight time
Find flight
from$173
23:50 — 05:53 Seattle — Chicago
UA747 United Airlines
1h 36m stop
07:45 — 11:12 Chicago — Boston
UA2067 United Airlines
23:54 — 12:48+1day
9h 54m flight time
Find flight
from$234
23:54 — 05:55 Seattle — Chicago
UA747 United Airlines
3h 19m stop
09:13 — 12:48 Chicago — Boston
UA536 United Airlines
Full flight schedule will help you in detecting at what time planes fly from Seattle to Boston. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.
*Departure and arrival times - local. Updated on October 2, 2025.

Popular Airlines on the Route

The flight Seattle — Boston is served by 5 regular airlines and 1 low-cost airlines. Most of the flights on this route are operated by Alaska Airlines - 13 departures per week at the price of from $216. And the most expensive tickets are offered by Vanair Limited airline - from $1213.

Direct flights

There’re no direct flights on this route. Try flights with stops.

Connecting Flights

There are 49 flights with layovers on the route. The fastest connecting flight is UA747 by United Airlines takes 7h 2m and the cheapest is UA747 by United Airlines for $172.
  • AS - Alaska Airlines
    from $216
  • F9 - Frontier Airlines
    from $173
  • HA - Hawaiian Airlines
    from $209
  • UA - United Airlines
    from $172
  • X4 - Vanair Limited
    from $1213
See more connecting flights

Airports

You can fly from Seattle to Boston from 3 airports (Boeing Field International Airport, Seattle-Tacoma Intl, Kenmore Air Harbor SPB).

Seattle airports

  • Boeing Field International Airport-BFI
    from $1213
  • Seattle-Tacoma Intl-SEA
    from $172
  • Kenmore Air Harbor SPB-LKE

Boston airports

  • Boston City Heliport-JBC
  • Boston RT128 Rail-ZRU
  • Boston South Rail-ZTO
  • Logan-BOS

Top Domestic Destinations from Seattle

You may also consider searching for discounted plane tickets to some other popular places from Seattle within United States.

Top International Destinations from Seattle

Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.

How to book a plane ticket yourself?

How to book an air ticket yourself?
  • Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find Flights»
  • Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
  • Click «Buy» when you are ready — our system will redirect you to the site that sells the selected flight ticket.
  • Fill in all passenger and payment information — passport and contact information, please double check all passengers’ names and make a payment for your itinerary.
  • That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.

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