Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Seattle to Boston from C$ 199

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
4 Aug — 11 Aug1
1 adult

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in January or March, booked 80 days in advance, depart on a Wednesday or Friday and return on a Wednesday

Cheap flight deals from Seattle to Boston

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Boston (BOS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 30 July 2025.

Round-trip from

C$ 299

One-way from

C$ 199

Popular in

December

Cheapest in

January

Average price

C$ 570

Good one-way deal

C$ 299 or less
Hawaiian Airlines
  • Hawaiian Airlines
  • 15/10-22/10
  • Nonstop
  • 11h 43m total
  • Seattle to Boston
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 14/9
  • 1 total stop
  • 20h 10m total
  • Seattle to Boston
Search Deals
High demand for flights, 7% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Boston Logan Intl.
Search Deals

Find flight deals from Seattle to Boston

Cheapest flights from Seattle to Boston
Explore the most affordable flight options available from Seattle to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 July 2025.

Wed 15/103:35 p.m.SEA - BOS
Nonstop5h 24mDelta
Wed 22/106:55 p.m.BOS - SEA
Nonstop6h 27mDelta
Deal found 30/7C$ 299
Tue 9/93:59 p.m.SEA - BOS
Nonstop5h 28mHawaiian Airlines
Thu 11/96:55 p.m.BOS - SEA
Nonstop6h 13mHawaiian Airlines
Deal found 27/7C$ 313
Sat 23/89:14 p.m.SEA - BOS
Nonstop5h 15mJetBlue
Sun 31/87:00 a.m.BOS - SEA
Nonstop6h 20mJetBlue
Deal found 28/7C$ 320
Wed 10/96:42 a.m.SEA - BOS
1 stop7h 57mAmerican Airlines
Tue 16/92:05 p.m.BOS - SEA
1 stop8h 54mAmerican Airlines
Deal found 28/7C$ 324
Tue 2/98:59 p.m.SEA - BOS
1 stop17h 56mAlaska Airlines
Tue 9/98:23 p.m.BOS - SEA
1 stop14h 44mAlaska Airlines
Deal found 28/7C$ 326
Mon 25/811:10 p.m.SEA - BOS
1 stop11h 10mSouthwest
Wed 27/811:25 a.m.BOS - SEA
1 stop13h 15mSouthwest
Deal found 28/7C$ 363
Thu 11/92:00 p.m.SEA - BOS
1 stop7h 45mUnited Airlines
Sun 14/96:10 a.m.BOS - SEA
1 stop8h 21mUnited Airlines
Deal found 28/7C$ 403

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Boston that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 30 July 2025.
Use the filters below to find and compare flights from Seattle to Boston that are best for you.

Fly from

Seattle

Fly to

Boston

Route

Depart

Return

Price

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 15/10

3:35 p.m.-11:59 p.m.

Nonstop5h 24m

Boston Logan Intl

Wed 22/10

6:43 p.m.-10:02 p.m.

Nonstop6h 19m

C$ 299

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 9/9

10:05 p.m.-6:30 a.m.

Nonstop5h 25m

Boston Logan Intl

Mon 15/9

6:45 p.m.-10:01 p.m.

Nonstop6h 16m

C$ 313

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 23/8

9:14 p.m.-5:29 a.m.

Nonstop5h 15m

Boston Logan Intl

Sun 31/8

7:00 a.m.-10:20 a.m.

Nonstop6h 20m

C$ 320

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 10/9

6:42 a.m.-5:39 p.m.

1 stop7h 57m

Boston Logan Intl

Tue 16/9

2:05 p.m.-7:59 p.m.

1 stop8h 54m

C$ 324

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 2/9

8:59 p.m.-5:55 p.m.

1 stop17h 56m

Boston Logan Intl

Tue 9/9

8:23 p.m.-8:07 a.m.

1 stop14h 44m

C$ 326

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 25/8

11:10 p.m.-1:20 p.m.

1 stop11h 10m

Boston Logan Intl

Wed 27/8

11:25 a.m.-9:40 p.m.

1 stop13h 15m

C$ 363

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 11/9

2:00 p.m.-12:45 a.m.

1 stop7h 45m

Boston Logan Intl

Sun 14/9

6:10 a.m.-11:31 a.m.

1 stop8h 21m

C$ 403

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 14/9

7:15 a.m.-6:25 a.m.

1 stop20h 10m

C$ 199

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 25/9

3:59 p.m.-12:27 a.m.

Nonstop5h 28m

C$ 206

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 3/9

10:05 p.m.-6:30 a.m.

Nonstop5h 25m

C$ 212

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/7

Showing 1-10 of 15 results
1
2

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 round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Boston. Price data was last updated on 25 July 2025.

Booking 80 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 C$ 291). Flying from Seattle to Boston in April is currently the most expensive (average of C$ 350). 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?

Find hourly flight availability from Seattle to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 30 July 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Boston in the afternoon. If you’re flexible enough to do this you can expect to save up to 47% on your trip compared to booking a flight in the morning.

Weekly flight availability from Seattle to Boston

Explore weekly flight availability from Seattle to Boston. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 30 July 2025.

The most flights from SEA to BOS are scheduled on a Tuesday (37 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (25 on average).

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Boston. Reviews last updated 30 July 2025.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andDelta from Seattle to Boston by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Boston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Seattle to Boston?

    Booking a flight from Seattle/Tacoma Intl (SEA) to Boston Logan Intl (BOS) is your only option if you wish to fly from Seattle to Boston. On a typical day, there are 32 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 24m for a nonstop flight. You can also purchase a plane ticket from 3 airlines when you book a flight from Seattle/Tacoma Intl to Boston.

  • How popular is this Seattle to Boston flight route?

    The Seattle/Tacoma Intl to Boston Logan Intl flight path was viewed by 50 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines flying from Seattle to Boston round-trip?

    Hawaiian Airlines, at C$ 299, was found to be the cheapest airline from Seattle to Boston.Alternate airlines to your destination round-trip include Delta and JetBlue. You may be able to fly from Seattle to Boston for 38% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Seattle to Boston one-way?

    The cheapest airline one-way is Alaska Airlines, with whom users have recently found tickets for as low as C$ 199. However, be on the lookout for offers from Hawaiian Airlines and Delta, as they are both options that can get you from Seattle to Boston for a low price.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Boston on time: Air France (92%), Scandinavian Airlines (91%), Virgin Atlantic (85%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 595, our data shows the cheapest flight currently is C$ 299. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 280 for that flight.

  • 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 vacation 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 C$ 291). Flying from Seattle to Boston in April is currently the most expensive (average of C$ 350). 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
Medford
Braintree
Waltham
Somerville
Rockland
Chelsea
Warwick
Milford
Plymouth
Quincy
Revere
Hampton
Old Orchard Beach
Lynn
Merrimack
Andover
Kennebunk
Amherst
Watertown
Seekonk

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Other flights to Boston

Explore flights to Boston departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 30 July 2025.
Calgary to Boston flights
Vancouver Intl to Boston flights
Toronto Island to Boston flights
Pearson Intl to Boston flights
Ottawa to Boston flights
Pierre Elliott Trudeau Intl to Boston flights
Boston to Orlando Airport flights
Boston to Calgary flights
Boston to Vancouver Intl Airport flights
Boston to Atlanta flights
Boston to Myrtle Beach flights
Boston to Toronto Island Airport flights
Boston to Ottawa flights
Boston to Fort Lauderdale flights
Boston to Toronto Pearson Intl Airport flights
Boston to Nashville flights
Boston to Dallas/Fort Worth Airport flights
Boston to Montreal Pierre Elliott Trudeau Intl Airport flights
Boston to Miami flights
Boston to Barcelona-El Prat Airport flights
Boston to San Juan Luis Munoz Marin Intl Airport flights
Boston to Vancouver Intl Airport flights
Boston to New Orleans flights
Boston to Atlanta flights

Top 3 airlines flying from Seattle to Boston

Discover the top 3 airlines that operate flights from Seattle to Boston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 30 July 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 137AverageC$ 362FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 167AverageC$ 529FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
JetBlueCheapestC$ 177AverageC$ 341FlexibilityNo cancel feeOn-time62%
Search JetBlue flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights helps you search for flights from Seattle to Boston via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Boston.

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

Yes! Cheapflights helps users easily find flights from Seattle to Boston with no change fees.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Boston from Seattle today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.