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Cheap flights from Seattle to Boston from £158

SEA — BOS
4 Dec — 11 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Boston

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Boston

Wed 2/1207:15 -
1 stop12h 37m
Mon 7/1206:15 -
1 stop17h 34m
Deal found 2/11£241
Thu 3/1220:09 -
1 stop17h 59m
Fri 11/1218:13 -
1 stop18h 19m
Deal found 3/11£252
Thu 3/1207:15 -
1 stop12h 37m
Fri 4/1206:15 -
1 stop17h 34m
Deal found 2/11£256
Mon 16/1117:19 -
1 stop9h 27m
Fri 11/1218:13 -
1 stop28h 05m
Deal found 1/11£261
Tue 1/1220:09 -
1 stop18h 00m
Fri 4/1218:13 -
1 stop28h 05m
Deal found 31/10£263
Mon 16/1117:19 -
1 stop9h 27m
Wed 18/1116:33 -
1 stop9h 27m
Deal found 2/11£266
Tue 1/1220:09 -
1 stop18h 00m
Tue 8/1218:13 -
1 stop28h 05m
Deal found 3/11£267
Tue 1/1207:15 -
1 stop12h 37m
Wed 2/1206:15 -
1 stop17h 34m
Deal found 31/10£271
Wed 9/1207:05 -
1 stop31h 03m
Sat 12/1218:13 -
1 stop18h 19m
Deal found 2/11£274
Thu 17/1206:00 -
1 stop20h 28m
Mon 4/117:47 -
1 stop32h 13m
Deal found 3/11£278
Mon 16/1120:18 -
1 stop8h 38m
Mon 23/1115:41 -
1 stop8h 58m
Deal found 2/11£281
Sun 13/1220:09 -
1 stop17h 59m
Wed 16/1218:13 -
1 stop27h 37m
Deal found 2/11£282

Find flight deals from Seattle to Boston

Round-trip from

£241

One-way from

£158

Popular in

December

Cheapest in

May

Average price

£404

Good one-way deal

£573 or less
Alaska Airlines
  • Alaska Airlines
  • 2/12-10/12
  • 2 total stops
  • 47h 15m total
  • Seattle to Boston
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 17/12-31/12
  • 1 total stop
  • 20h 28m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£29 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£6 potential savings vs. average return price).
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Average for round-trip flights in November 2026
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Boston Logan Intl.
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Seattle to Boston that are best for you.

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Route

Depart

Return

Price

Cheapest return flight

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Thu 17/12

06:00-05:28

1 stop20h 28m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£158

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Fri 18/12

21:09-05:28

1 stop29h 19m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£173

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Tue 1/12

06:30-16:20

1 stop6h 50m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174
Fastest return journey

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Fri 11/12

15:45-00:02

Nonstop5h 17m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Sat 24/4

22:40-09:24

1 stop7h 44m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Sun 13/12

15:45-00:02

Nonstop5h 17m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Sun 17/1

08:08-19:08

1 stop8h 00m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Fri 18/12

15:45-00:02

Nonstop5h 17m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Thu 26/11

08:40-17:01

Nonstop5h 21m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Wed 3/3

07:20-15:54

Nonstop5h 34m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£174

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 21 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from Seattle with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Seattle to Boston

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

The best time to book flights from Seattle to Boston is 83 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Boston?

Currently, May is the cheapest month in which you can book a flight from Seattle to Boston (average of £286). Flying from Seattle to Boston in December is currently the most expensive (average of £417). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to BOS?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Boston as you normally would.

How much does it cost for a return flight from Seattle to Boston?

Airfare is below average for this route at the moment.

Seattle to Boston flights typically cost between £306 and £527 in December.
The cheapest return price found within the last 5 days was £241 on Delta (2 Dec–7 Dec).

Related info for your journey

  • How popular is this Seattle to Boston flight route?

    Flights from Seattle/Tacoma Intl to Boston Logan Intl have been viewed 1 times in the past calendar month.

  • How long is the flight from Seattle to Boston?

    Airlines like Alaska Airlines, Delta, and United Airlines fly from Seattle to Boston in about 5h 17m. The time it takes to get you to your destination can typically vary by up to 4h 10m. The distance between Seattle and Boston is about 2487 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most reliable airlines from Seattle to Boston?

    The top 3 most reliable airlines when flying from Seattle to Boston are LATAM Airlines (99%), Condor (94%) and Aer Lingus (90%).

  • Can I find deals for flights from Seattle to Boston that include hotel bookings?

    Yes. In addition to deals on Seattle to Boston flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Boston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Boston.

  • Can I find deals for business class flights from Seattle to Boston?

    Yes. Cheapflights offers flight deals from Seattle to Boston by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Boston?

    Currently, May is the cheapest month in which you can book a flight from Seattle to Boston (average of £286). Flying from Seattle to Boston in December is currently the most expensive (average of £417). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Burlington
Canton
North Truro
Warwick
Waltham
Cambridge
Wellfleet
Peabody
Revere
Somerville
Chelmsford
Quincy
Raynham

Browse thousands of different options on Cheapflights for your next trip

Fly with Cheapflights

How does Cheapflights help users find flights from Seattle to Boston?

Deals for Seattle to Boston flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Boston?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Boston from Seattle.

Can Cheapflights find flights from Seattle to Boston with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Seattle to Boston, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Seattle to Boston become cheaper?

Not ready to book yet? You can track prices for flights from Seattle to Boston on Cheapflights with our Price Alert feature and get notified when better prices are available.

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