Cheap Flights from Boston, MA to Seattle, WA from $154

Return flight: Seattle – Boston

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 $154, 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: $154 (one-way), $264 (round-trip).
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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
16:25 — 19:48
16:25 — 19:48 HA4808 Hawaiian Airlines
Boston — Seattle
6h 23m
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from$246
16:25 — 19:48
16:25 — 19:48 AS304 Alaska Airlines
Boston — Seattle
6h 23m
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from$250
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$183
06:00 — 11:32
06:00 — 07:58 UA1414 United Airlines
Boston — Chicago
47m stop
08:45 — 11:32 UA1414 United Airlines
Chicago — Seattle
8h 32m
including layover
Find flight
from$246
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$183
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$367
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$401
08:21 — 15:42
07:00 — 09:05 AS4570 Alaska Airlines
Boston — Chicago
2h 47m stop
13:01 — 15:35 AS891 Alaska Airlines
Chicago — Seattle
10h 21m
including layover
Find flight
from$273
08:41 — 16:47
08:35 — 12:06 UA1008 United Airlines
Boston — San Francisco
2h 18m stop
14:30 — 16:47 UA5917 United Airlines
San Francisco — Seattle
11h 6m
including layover
Find flight
from$292
09:35 — 16:20
09:35 — 11:26 UA378 United Airlines
Boston — Chicago
2h 14m stop
13:40 — 16:20 UA1485 United Airlines
Chicago — Seattle
9h 45m
including layover
Find flight
from$247
09:35 — 15:42
09:35 — 11:26 UA378 United Airlines
Boston — Chicago
1h 37m stop
13:03 — 15:42 HA6300 Hawaiian Airlines
Chicago — Seattle
9h 7m
including layover
Find flight
from$777
10:40 — 16:20
10:40 — 12:31 UA1298 United Airlines
Boston — Chicago
1h 9m stop
13:40 — 16:20 UA1485 United Airlines
Chicago — Seattle
8h 40m
including layover
Find flight
from$438
11:42 — 17:39
11:30 — 14:20 UA414 United Airlines
Boston — Denver
1h 25m stop
15:59 — 18:04 UA745 United Airlines
Denver — Seattle
8h 57m
including layover
Find flight
from$370
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
Find flight
from$183
12:29 — 20:48
12:29 — 14:09 UA1365 United Airlines
Boston — Washington D.C.
3h 46m stop
17:55 — 20:48 UA326 United Airlines
Washington D.C. — Seattle
11h 19m
including layover
Find flight
from$467
13:22 — 21:23
13:22 — 15:55 UA497 United Airlines
Boston — Denver
3h 30m stop
19:25 — 21:23 UA299 United Airlines
Denver — Seattle
11h 1m
including layover
Find flight
from$467
13:30 — 21:17
13:30 — 14:57 UA2454 United Airlines
Boston — Newark
3h 2m stop
17:59 — 21:17 UA2044 United Airlines
Newark — Seattle
10h 47m
including layover
Find flight
from$467
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$182
14:46 — 20:48
14:46 — 16:30 UA539 United Airlines
Boston — Washington D.C.
1h 25m stop
17:55 — 20:48 UA326 United Airlines
Washington D.C. — Seattle
9h 2m
including layover
Find flight
from$245
15:15 — 22:18
15:15 — 17:59 UA702 United Airlines
Boston — Denver
2h 21m stop
20:20 — 22:18 UA2651 United Airlines
Denver — Seattle
10h 3m
including layover
Find flight
from$292
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
Find flight
from$182
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$182
17:06 — 21:54
17:06 — 20:24 HA6255 Hawaiian Airlines
Boston — Portland
35m stop
20:59 — 21:54 HA6567 Hawaiian Airlines
Portland — Seattle
7h 48m
including layover
Find flight
from$248
17:06 — 22:59
17:06 — 20:24 AS1319 Alaska Airlines
Boston — Portland
1h 35m stop
21:59 — 22:59 AS3408 Alaska Airlines
Portland — Seattle
8h 53m
including layover
Find flight
from$256
18:03 — 23:59
18:03 — 20:00 UA1015 United Airlines
Boston — Chicago
1h 16m stop
21:16 — 23:59 UA1001 United Airlines
Chicago — Seattle
8h 56m
including layover
Find flight
from$236
18:11 — 00:59
+1 day
18:11 — 21:49 UA2400 United Airlines
Boston — San Francisco
1h 6m stop
22:55 — 00:59 UA2400 United Airlines
San Francisco — Seattle
9h 48m
including layover
Find flight
from$291
19:00 — 00:59
+1 day
19:00 — 20:46 UA2136 United Airlines
Boston — Washington D.C.
1h 23m stop
22:09 — 00:59 UA2713 United Airlines
Washington D.C. — Seattle
8h 59m
including layover
Find flight
from$247
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$182
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$221
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$230
15:18 — 00:59
+1 day
15:18 — 17:10 UA1032 United Airlines
Boston — Chicago
1h 10m stop
18:20 — 21:09 UA2179 United Airlines
Chicago — San Francisco
1h 46m stop
22:55 — 00:59 UA2400 United Airlines
San Francisco — Seattle
12h 41m
including layover
Find flight
from$472
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$154
*Departure and arrival times - local. Updated on August 1, 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 154 $), july (from 182 $), august (from 182 $).

The most expensive months are december (from 655 $), may (from 204 $), august (from 182 $).

What is the lowest airfare Boston to Seattle?

The cheapest plane ticket found by our users is $154. 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
$154
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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 $ 230 . And the most expensive tickets are offered by Alaska Airlines airline - from $ 793.

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 $246.

  • AS - Alaska Airlines
    from $250
    Find
  • HA - Hawaiian Airlines
    from $246
    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 $154.

  • AS - Alaska Airlines
    from $230
    Find
  • HA - Hawaiian Airlines
    from $221
    Find
  • UA - United Airlines
    from $182
    Find
  • NK - Spirit Airlines
    from $154
    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
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  • Boston South Rail-ZTO
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  • Logan-BOS
    from $154
    Find

Seattle airports

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

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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