This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
10 Oct — 17 Oct1
Round-trip
1 adult
Economy
Round-trip
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in September or October, booked 84 days in advance, depart on a Sunday or Thursday and return on a Thursday
Cheap flight deals from Seattle to Boston
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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 10 September 2026.
Tue 6/109:40 p.m. -
1 stop10h 11m
Wed 14/101:00 p.m. -
1 stop11h 20m
Deal found 6/9C$ 457
Wed 14/1011:55 p.m. -
Nonstop5h 21m
Tue 20/107:20 p.m. -
Nonstop6h 22m
Deal found 9/9C$ 460
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Sat 10/107:20 p.m. -
Nonstop6h 22m
Deal found 10/9C$ 461
Sat 7/115:19 p.m. -
1 stop9h 27m
Tue 17/117:03 a.m. -
1 stop17h 26m
Deal found 10/9C$ 474
Wed 14/1011:55 p.m. -
Nonstop5h 21m
Sat 17/101:00 p.m. -
1 stop11h 21m
Deal found 9/9C$ 477
Mon 26/1012:10 a.m. -
1 stop9h 20m
Sat 7/1110:40 a.m. -
1 stop8h 25m
Deal found 10/9C$ 481
Sat 7/111:03 p.m. -
1 stop13h 43m
Wed 11/117:03 a.m. -
1 stop29h 25m
Deal found 7/9C$ 488
Fri 6/118:48 p.m. -
1 stop29h 58m
Mon 16/116:09 p.m. -
1 stop30h 20m
Deal found 10/9C$ 490
Wed 21/102:59 p.m. -
1 stop11h 22m
Tue 27/107:51 a.m. -
2 stops15h 05m
Deal found 9/9C$ 495
Best flights from Seattle to Boston
Discover carefully curated flight deals from Seattle to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 10 September 2026.
Sat 5/126:45 a.m. -
1 stop7h 20m
Sat 9/18:40 a.m. -
1 stop10h 35m
Deal found 5/9C$ 488
Tue 10/118:59 p.m. -
1 stop7h 21m
Thu 12/117:03 a.m. -
1 stop12h 53m
Deal found 5/9C$ 535
Thu 5/119:10 a.m. -
2 stops10h 20m
Tue 10/115:55 p.m. -
1 stop8h 35m
Deal found 8/9C$ 532
Sun 1/117:13 a.m. -
1 stop19h 33m
Sun 8/117:13 a.m. -
Nonstop6h 26m
Deal found 9/9C$ 560
Thu 22/102:10 p.m. -
1 stop8h 05m
Sat 31/1010:35 a.m. -
2 stops10h 55m
Deal found 7/9C$ 532
Sat 10/102:59 p.m. -
1 stop11h 22m
Sat 17/107:03 a.m. -
Nonstop6h 17m
Deal found 7/9C$ 569
Sat 14/116:45 a.m. -
1 stop7h 20m
Thu 19/118:25 a.m. -
2 stops16h 05m
Deal found 5/9C$ 551
Fri 23/103:32 p.m. -
Nonstop5h 27m
Fri 30/109:03 a.m. -
Nonstop6h 17m
Deal found 8/9C$ 590
Fri 23/1011:05 a.m. -
2 stops9h 50m
Fri 30/1010:40 a.m. -
2 stops13h 20m
Deal found 8/9C$ 587
Wed 11/119:20 p.m. -
Nonstop5h 20m
Mon 16/116:20 p.m. -
Nonstop6h 24m
Deal found 9/9C$ 590
Fri 12/29:50 p.m. -
1 stop14h 37m
Mon 15/26:32 p.m. -
Nonstop6h 26m
Deal found 6/9C$ 604
Direct flights from Seattle to Boston
Explore direct flight options from Seattle to Boston based on user searches, and compare prices and availability for your desired travel dates. Data last updated 10 September 2026.
Wed 14/1011:55 p.m. -
Nonstop5h 21m
Wed 21/107:20 p.m. -
Nonstop6h 22m
Deal found 9/9C$ 460
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Sat 10/107:20 p.m. -
Nonstop6h 22m
Deal found 10/9C$ 461
Thu 15/1011:55 p.m. -
Nonstop5h 21m
Tue 20/107:20 p.m. -
Nonstop6h 22m
Deal found 9/9C$ 497
Mon 5/1011:42 p.m. -
Nonstop5h 24m
Tue 13/107:20 p.m. -
Nonstop6h 22m
Deal found 9/9C$ 535
Tue 29/911:42 p.m. -
Nonstop5h 24m
Mon 5/107:09 p.m. -
Nonstop6h 22m
Deal found 6/9C$ 546
Thu 8/1011:56 p.m. -
Nonstop5h 21m
Sat 10/107:20 p.m. -
Nonstop6h 22m
Deal found 8/9C$ 560
Thu 22/1011:55 p.m. -
Nonstop5h 21m
Sat 31/107:03 a.m. -
Nonstop6h 17m
Deal found 7/9C$ 562
Tue 29/911:42 p.m. -
Nonstop5h 24m
Thu 8/107:29 p.m. -
Nonstop6h 22m
Deal found 6/9C$ 580
Tue 10/119:20 p.m. -
Nonstop5h 20m
Wed 11/119:03 a.m. -
Nonstop6h 24m
Deal found 10/9C$ 583
Sat 5/1211:40 p.m. -
Nonstop5h 22m
Sat 9/16:28 p.m. -
Nonstop6h 28m
Deal found 5/9C$ 589
Thu 5/111:40 p.m. -
Nonstop5h 30m
Sun 8/117:25 p.m. -
Nonstop6h 24m
Deal found 10/9C$ 590
Last-minute flights from Seattle to Boston
Discover last-minute flight deals from Seattle to Boston. Data last updated 10 September 2026 and is based on user searches.
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Sat 10/107:20 p.m. -
Nonstop6h 22m
Deal found 10/9C$ 461
Tue 6/109:40 p.m. -
1 stop10h 11m
Wed 14/101:00 p.m. -
1 stop11h 20m
Deal found 6/9C$ 457
Wed 14/1011:55 p.m. -
Nonstop5h 21m
Wed 21/107:20 p.m. -
Nonstop6h 22m
Deal found 9/9C$ 460
Wed 14/1011:55 p.m. -
Nonstop5h 21m
Sat 17/101:00 p.m. -
1 stop11h 21m
Deal found 9/9C$ 477
Wed 21/102:59 p.m. -
1 stop11h 22m
Tue 27/107:51 a.m. -
2 stops15h 05m
Deal found 9/9C$ 495
Fri 23/104:54 p.m. -
1 stop9h 27m
Wed 28/106:14 p.m. -
1 stop26h 48m
Deal found 10/9C$ 490
Sat 24/104:54 p.m. -
1 stop9h 27m
Wed 28/106:14 p.m. -
1 stop24h 03m
Deal found 10/9C$ 474
Mon 26/1012:10 a.m. -
1 stop9h 20m
Sat 7/1110:40 a.m. -
1 stop8h 25m
Deal found 10/9C$ 481
Tue 27/104:54 p.m. -
1 stop9h 34m
Wed 4/117:03 a.m. -
1 stop10h 42m
Deal found 10/9C$ 488
One-way flights from Seattle to Boston
Search for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated 10 September 2026.
Wed 30/911:42 p.m. -
Nonstop5h 24m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 268
Fri 23/108:24 a.m. -
1 stop10h 25m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 274
Fri 30/109:05 a.m. -
1 stop9h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 10/9C$ 275
Mon 19/104:54 p.m. -
1 stop9h 27m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 9/9C$ 276
Sat 3/102:59 p.m. -
1 stop11h 22m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 5/9C$ 282
Mon 5/109:08 p.m. -
1 stop29h 13m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 9/9C$ 286
Mon 7/126:10 a.m. -
1 stop7h 40m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 8/9C$ 287
Tue 6/1012:10 a.m. -
2 stops11h 45m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 289
Sat 21/1112:15 a.m. -
1 stop7h 55m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 6/9C$ 293
Fri 6/119:20 p.m. -
Nonstop5h 20m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 9/9C$ 296
Find 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 10 September 2026.
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 7,457,451 searches. Data last updated 10 September 2026.
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 round-trip
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sat 14/11
3:58 p.m.-5:46 a.m.
1 stop10h 48m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 279
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 16/11
9:25 a.m.-10:10 p.m.
2 stops9h 45m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 289
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 19/10
3:32 p.m.-11:59 p.m.
Nonstop5h 27m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 296
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sat 5/12
8:21 a.m.-4:46 p.m.
Nonstop5h 25m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 296
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 4/11
3:36 p.m.-11:58 p.m.
Nonstop5h 22m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 296
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Thu 3/12
3:43 p.m.-12:05 a.m.
Nonstop5h 22m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 296
Quickest round-trip
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Tue 10/11
9:20 p.m.-5:40 a.m.
Nonstop5h 20m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 296
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Fri 4/12
8:21 a.m.-4:46 p.m.
Nonstop5h 25m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 296
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 21/10
3:32 p.m.-11:59 p.m.
Nonstop5h 27m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 296
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 7/12
7:59 p.m.-5:30 p.m.
1 stop18h 31m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 300
Flights are sorted by cheapest round-trip flights first.
Deals found on 5/9
Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3
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.
SEA-BOS
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
Prices
Airlines
Delays
How far ahead should I book a flight from Seattle to Boston?
Booking 83 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, September is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 514). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 749). 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 10 September 2026.
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 21% on your trip compared to booking a flight in the morning.
How much does it cost to fly round-trip from Seattle to Boston?
Airfare is typical for this route at the moment.
Seattle to Boston flights typically cost between C$ 441 and C$ 676 in October.The cheapest round-trip price found within the last 5 days was C$ 457 on JetBlue (6 Oct-14 Oct).
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 10 September 2026.
The most flights from SEA to BOS are scheduled on a Wednesday (24 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (8 on average).
How often are flights from Seattle to Boston delayed?
About 17% of weekly flights between Seattle and Boston have experienced delays in the past year, with the average delay time being 172 minutes.
What is the most punctual flight time for Seattle to Boston flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Seattle to Boston flights?
Over the past year, Delta has had the lowest number of delays on this route, with just 12% of flights being delayed.
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 10 September 2026.
Get a feel of what it's like to fly with Alaska Airlines and JetBlue 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.
There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
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 13 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 21m for a nonstop flight. You can also purchase a plane ticket from 2 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 21 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
How long is the flight from Seattle to Boston?
There are many flights that can get you from Seattle to Boston in 7h 20m. Fly via Southwest or Alaska Airlines to get the fastest option. The distance from Seattle to Boston is about 4002 km. This flight may include one or multiple stops.
What are the cheapest airlines flying from Seattle to Boston round-trip?
Alaska Airlines, at C$ 211, was found to be the cheapest airline from Seattle to Boston. An alternate airline flying to your destination would be JetBlue. You may be able to fly from Seattle to Boston for 64% less than the average price by searching for these airlines.
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: EL AL (100%), LATAM Airlines (94%), Condor (86%).
What are the cheapest flights from Seattle to Boston?
While on average a flight from Seattle to Boston is generally C$ 1,061, our data shows the cheapest flight currently is C$ 322. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 532 for that flight.
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, September is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 514). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 749). 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.
Book flights to Boston if you plan to visit one of these locations
Old Orchard Beach
Cape Elizabeth
Hampton
Merrimack
Ogunquit
Saugus
Revere
Braintree
Milford
Waltham
Watertown
Warwick
Lawrence
Pawtucket
Seekonk
Foxborough
Nashua
Kittery
Browse thousands of different options on Cheapflights for your next trip
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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 10 September 2026.
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on 10 September 2026.
Discover the top 2 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 7,457,451 searches. Data last updated 10 September 2026.
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.
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