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Cheap flights from Seattle to Boston from £149

SEA — BOS
19 Oct — 26 Oct1
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

Thu 29/1011:05 -
1 stop9h 10m
Wed 11/1117:55 -
1 stop8h 40m
Deal found 15/9£250
Wed 11/1109:30 -
1 stop11h 15m
Mon 16/1107:10 -
1 stop8h 40m
Deal found 15/9£255
Sat 24/1010:55 -
1 stop9h 25m
Mon 26/1018:35 -
1 stop9h 05m
Deal found 15/9£256
Thu 22/1014:10 -
1 stop8h 05m
Tue 27/1005:15 -
2 stops12h 05m
Deal found 16/9£261
Sat 10/1023:55 -
Nonstop5h 21m
Sat 17/1019:20 -
Nonstop6h 22m
Deal found 18/9£261
Sat 17/1023:55 -
Nonstop5h 21m
Wed 21/1019:20 -
Nonstop6h 22m
Deal found 18/9£263
Sat 31/1006:15 -
1 stop7h 50m
Mon 2/1116:20 -
1 stop11h 20m
Deal found 16/9£265
Thu 5/1111:10 -
2 stops9h 45m
Sat 7/1105:25 -
2 stops13h 40m
Deal found 16/9£269

Find flight deals from Seattle to Boston

Round-trip from

£250

One-way from

£149

Popular in

December

Cheapest in

May

Average price

£293
Southwest
  • Southwest
  • 4/11-9/11
  • 2 total stops
  • 21h 15m total
  • Seattle to Boston
Search Deals
Southwest
  • Southwest
  • 5/10-31/12
  • 2 total stops
  • 11h 45m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£13 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
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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.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Thu 10/12

06:10-21:40

2 stops12h 30m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£152

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Thu 19/11

06:10-21:45

2 stops12h 35m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£152

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Thu 29/10

09:05-21:24

1 stop9h 19m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£156

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Mon 16/11

17:19-05:46

1 stop9h 27m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£160
Fastest return journey

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Sun 22/11

23:07-07:20

Nonstop5h 13m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£167

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Thu 17/12

15:45-00:02

Nonstop5h 17m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£167

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Sun 15/11

21:20-05:40

Nonstop5h 20m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£167

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Sun 8/11

07:24-16:00

Nonstop5h 36m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£167

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Mon 16/11

07:38-16:00

Nonstop5h 22m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£167

SeattleBoston

SEA Seattle/Tacoma Intl - BOS Boston Logan Intl

SEABOS

Seattle/Tacoma Intl

Mon 12/10

23:10-07:35

Nonstop5h 25m

Boston Logan Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£167

Flights are sorted by cheapest return flights first.

Deals found on 19/9

Showing 1-10 of 20 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 £407). 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 typical for this route at the moment.

Seattle to Boston flights typically cost between £236 and £394 in October.
The cheapest return price found within the last 5 days was £250 on Southwest (29 Oct–11 Nov).

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 United Airlines and Southwest fly from Seattle to Boston in about 7h 10m. The time it takes to get you to your destination can typically vary by up to 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 EL AL (97%), LATAM Airlines (93%) and Scandinavian Airlines (89%).

  • 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 £407). 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
Waltham
Warwick
Cambridge
Wellfleet
Peabody
Revere
Somerville
Quincy
Chelmsford
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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