Cheap Flights from Boston, MA to Seattle, WA from $145

Return flight: Seattle – Boston
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On Cheapflightsplus.com you will find 2 direct and 47 connecting flights from Boston to Seattle. You can compare airfare deals from 4 airlines and multiple travel sites from $145, book and save on cheap plane tickets and last minute offers. Also check out BOS-SEA flight schedule to find best flight time, convenient departure and arrival airports.

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

To find the cheapest one way airline ticket select the date with the lowest price on the calendar below and click «Find Flights». To search for round-trip flight deals click on the link «Check prices for return flights» and select the date of the return flight. Cheapest flights in November: $145 (one-way), $249 (round-trip).
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Best Flights from Boston to Seattle Today

Take a look at the list of non stop flights and flights with layovers from Boston to Seattle with the lowest price of $145. The fastest direct flight takes 6h 23m and the fastest connecting – 7h 48m.
Price Departure Arrival Flight Duration Airline Flight
from $191
Find flight
16:25
Boston
Logan
 19:48
Seattle
Seattle-Tacoma Intl
 6h 23m Hawaiian Airlines
HA4808
from $193
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16:25
Boston
Logan
 19:48
Seattle
Seattle-Tacoma Intl
 6h 23m Alaska Airlines
AS304
from $171
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19:12
Boston
Logan
 00:56+1 день
Seattle
Seattle-Tacoma Intl
 8h 44m
layover
1h 8m - Washington D.C.
 United Airlines
UA2136
UA716
from $192
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06:00
Boston
Logan
 12:52
Seattle
Seattle-Tacoma Intl
 9h 52m
layover
2h 40m - Portland
 Alaska Airlines
AS311
AS2124
from $145
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21:40
Boston
Logan
 15:03+1 день
Seattle
Seattle-Tacoma Intl
 20h 23m
layover
6h 47m - Baltimore
4h 8m - Las Vegas
 Spirit Airlines
NK2523
NK2015
NK2327
from $444
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14:46
Boston
Logan
 23:59
Seattle
Seattle-Tacoma Intl
 12h 13m
layover
0h 48m - Washington D.C.
2h 31m - Chicago
 United Airlines
UA539
UA2497
UA1001
Show all tickets
*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on September 18, 2025
Full flight schedule will help you in detecting at what time planes fly from Boston to Seattle. 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 Arrival Flight Details Flight Duration Price
05:30 — 11:35
05:30 — 07:04 UA1734 United Airlines
Boston — Washington D.C.
1h 41m stop
08:45 — 11:35 UA2665 United Airlines
Washington D.C. — Seattle
9h 5m
including layover
Find flight
from$172
06:00 — 12:52
06:00 — 09:12 AS311 Alaska Airlines
Boston — Portland
2h 40m stop
11:58 — 12:55 AS2124 Alaska Airlines
Portland — Seattle
9h 52m
including layover
Find flight
from$192
06:55 — 12:11
07:00 — 08:21 UA570 United Airlines
Boston — Newark
46m stop
09:51 — 12:59 UA2364 United Airlines
Newark — Seattle
8h 16m
including layover
Find flight
from$172
07:30 — 16:54
07:00 — 10:49 HA4826 Hawaiian Airlines
Boston — San Francisco
3h 38m stop
14:39 — 16:50 HA7030 Hawaiian Airlines
San Francisco — Seattle
12h 24m
including layover
Find flight
from$206
07:30 — 16:54
07:30 — 11:07 AS308 Alaska Airlines
Boston — San Francisco
3h 38m stop
14:45 — 16:54 AS1225 Alaska Airlines
San Francisco — Seattle
12h 24m
including layover
Find flight
from$214
12:29 — 20:41
12:29 — 14:09 UA411 United Airlines
Boston — Washington D.C.
3h 39m stop
17:48 — 20:41 UA326 United Airlines
Washington D.C. — Seattle
11h 12m
including layover
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from$172
14:00 — 20:56
14:00 — 17:31 UA1074 United Airlines
Boston — San Francisco
1h 9m stop
18:55 — 21:11 UA2019 United Airlines
San Francisco — Seattle
9h 56m
including layover
Find flight
from$171
16:25 — 19:48
16:25 — 19:48 HA4808 Hawaiian Airlines
Boston — Seattle
6h 23m
Find flight
from$191
16:25 — 19:48
16:25 — 19:48 AS304 Alaska Airlines
Boston — Seattle
6h 23m
Find flight
from$193
16:27 — 23:59
16:27 — 18:20 UA2040 United Airlines
Boston — Chicago
2h 56m stop
21:16 — 23:59 UA1001 United Airlines
Chicago — Seattle
10h 32m
including layover
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from$171
16:57 — 22:59
16:57 — 19:46 UA800 United Airlines
Boston — Denver
1h 14m stop
21:00 — 22:59 UA2651 United Airlines
Denver — Seattle
9h 2m
including layover
Find flight
from$171
19:12 — 00:56
+1 day
19:12 — 20:58 UA2136 United Airlines
Boston — Washington D.C.
1h 8m stop
22:06 — 00:56 UA716 United Airlines
Washington D.C. — Seattle
8h 44m
including layover
Find flight
from$171
20:19 — 08:04
+1 day
20:19 — 23:59 HA4812 Hawaiian Airlines
Boston — San Francisco
6h 1m stop
06:00 — 08:04 HA7023 Hawaiian Airlines
San Francisco — Seattle
14h 45m
including layover
Find flight
from$208
20:19 — 08:04
+1 day
20:19 — 23:59 AS355 Alaska Airlines
Boston — San Francisco
6h 1m stop
06:00 — 08:04 AS981 Alaska Airlines
San Francisco — Seattle
14h 45m
including layover
Find flight
from$216
21:40 — 15:03
+1 day
19:47 — 21:21 NK2523 Spirit Airlines
Boston — Baltimore
6h 47m stop
07:17 — 09:25 NK2015 Spirit Airlines
Baltimore — Las Vegas
4h 8m stop
11:40 — 14:25 NK2327 Spirit Airlines
Las Vegas — Seattle
20h 23m
including layover
Find flight
from$145
*Departure and arrival times - local. Updated on September 18, 2025

Flight Information

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

Distance between Boston and Seattle is 4005 miles. Time difference between the cities is 3h. Airplanes depart 05:30 to 21:40 from 4 Boston airports and arrive 05:30 to 21:40 to 3 Seattle airports. Average flight time is 6h 23m.

  • The fastest flight 6h 23m
  • Average flight time 6h 23m
  • The earliest flight 05:30
  • The latest flight 21:40
  • Distance 2489 ml

The cheapest months to travel to Seattle are june (from 145 $), july (from 171 $), august (from 171 $).

The most expensive months are december (from 617 $), may (from 192 $), august (from 171 $).

What is the lowest airfare Boston to Seattle?

The cheapest plane ticket found by our users is $145. This airfare is for economy class on one-way NK2523 flight by Spirit Airlines for June 26, 2025 which leaves Logan in Boston at 21:40 am and arrives at Seattle Seattle-Tacoma Intl at 15:03.

Economy class
$145
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Business class
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First class
?
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Popular Airlines on the Route

The flight Boston — Seattle is served by 4 regular airlines and 1 low-cost airline. Most of the flights on this route are operated by Alaska Airlines - 10 departures per week at the price of from $ 192 . And the most expensive tickets are offered by Alaska Airlines airline - from $ 746.

Direct flights

There are 2 nonstop flights on the route. The fastest direct flight is HA4808 by Hawaiian Airlines takes 6h 23m and the cheapest is NK2523 by Spirit Airlines for $191.

  • AS - Alaska Airlines
    from $193
    Find
  • HA - Hawaiian Airlines
    from $191
    Find
See more direct flights

Connecting Flights

There are 47 flights with layovers on the route. The fastest connecting flight is HA6255 by Hawaiian Airlines takes 7h 48m and the cheapest is NK2523 by Spirit Airlines for $145.

  • AS - Alaska Airlines
    from $192
    Find
  • HA - Hawaiian Airlines
    from $206
    Find
  • UA - United Airlines
    from $171
    Find
  • NK - Spirit Airlines
    from $145
    Find
See more connecting flights

Airports

You can fly from Boston to Seattle from 4 airports (Boston City Heliport, Boston RT128 Rail, Boston South Rail, Logan).

Boston airports

  • Boston City Heliport-JBC
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  • Boston RT128 Rail-ZRU
    Find
  • Boston South Rail-ZTO
    Find
  • Logan-BOS
    from $145
    Find

Seattle airports

  • Boeing Field International Airport-BFI
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  • Seattle-Tacoma Intl-SEA
    Find
  • Kenmore Air Harbor SPB-LKE
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Airplanes

There are flights to Seattle from Boston by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.

Top Domestic Destinations from Boston

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

Top International Destinations from Boston

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.

    To find a plane ticket, please select dates.

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