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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
25 Nov — 2 Dec1
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 May or February, booked 84 days in advance, depart on a Friday or Wednesday and return on a Monday
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 26 October 2026.
Wed 2/127:00 a.m. -
1 stop9h 50m
Tue 8/125:55 p.m. -
1 stop8h 40m
Deal found 22/10C$ 437
Mon 30/1112:15 a.m. -
1 stop8h 45m
Sat 12/129:30 a.m. -
2 stops14h 00m
Deal found 21/10C$ 445
Thu 10/126:10 a.m. -
2 stops12h 35m
Mon 14/123:30 p.m. -
2 stops11h 05m
Deal found 22/10C$ 452
Thu 3/126:30 a.m. -
1 stop6h 50m
Sun 6/126:30 p.m. -
1 stop9h 05m
Deal found 21/10C$ 455
Tue 8/126:10 a.m. -
1 stop7h 40m
Tue 15/125:55 p.m. -
1 stop8h 40m
Deal found 25/10C$ 458
Fri 4/129:25 a.m. -
2 stops9h 20m
Tue 8/122:25 p.m. -
2 stops11h 25m
Deal found 23/10C$ 469
Fri 4/1211:20 a.m. -
1 stop7h 25m
Mon 7/128:25 a.m. -
2 stops16h 15m
Deal found 23/10C$ 471
Tue 8/126:10 a.m. -
2 stops12h 35m
Wed 16/123:30 p.m. -
2 stops11h 05m
Deal found 25/10C$ 472
Fri 13/115:30 a.m. -
1 stop13h 35m
Thu 19/118:25 a.m. -
2 stops16h 15m
Deal found 23/10C$ 478
Mon 9/1112:15 a.m. -
2 stops12h 35m
Tue 10/115:55 p.m. -
1 stop8h 40m
Deal found 21/10C$ 479
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 26 October 2026.
Tue 19/16:20 a.m. -
1 stop7h 20m
Tue 26/11:15 p.m. -
2 stops12h 40m
Deal found 21/10C$ 445
Fri 13/118:48 p.m. -
1 stop16h 53m
Thu 19/117:03 a.m. -
1 stop10h 42m
Deal found 24/10C$ 532
Fri 13/115:30 a.m. -
1 stop13h 35m
Thu 19/118:25 a.m. -
2 stops16h 15m
Deal found 23/10C$ 478
Sat 9/17:05 a.m. -
1 stop8h 45m
Mon 11/17:25 a.m. -
1 stop8h 45m
Deal found 25/10C$ 556
Wed 4/117:59 p.m. -
1 stop17h 42m
Fri 13/119:03 a.m. -
Nonstop6h 24m
Deal found 21/10C$ 612
Sat 19/129:09 p.m. -
1 stop29h 19m
Sun 3/14:46 p.m. -
1 stop9h 11m
Deal found 24/10C$ 630
Tue 15/129:25 a.m. -
2 stops9h 50m
Sat 19/1212:40 p.m. -
2 stops13h 25m
Deal found 21/10C$ 574
Thu 17/123:35 p.m. -
Nonstop5h 24m
Fri 25/129:00 a.m. -
Nonstop6h 38m
Deal found 25/10C$ 654
Fri 18/129:09 p.m. -
1 stop29h 19m
Sun 3/14:46 p.m. -
1 stop9h 11m
Deal found 25/10C$ 679
Wed 25/118:30 p.m. -
2 stops11h 35m
Wed 2/123:30 p.m. -
2 stops11h 05m
Deal found 25/10C$ 682
Thu 12/115:19 p.m. -
1 stop9h 27m
Tue 8/126:13 p.m. -
1 stop19h 14m
Deal found 25/10C$ 679
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 26 October 2026.
Sun 15/119:20 p.m. -
Nonstop5h 20m
Mon 16/119:03 a.m. -
Nonstop6h 24m
Deal found 21/10C$ 647
Sat 14/111:40 p.m. -
Nonstop5h 10m
Fri 20/117:50 a.m. -
Nonstop6h 27m
Deal found 24/10C$ 653
Mon 23/111:40 p.m. -
Nonstop5h 10m
Fri 27/117:50 a.m. -
Nonstop6h 30m
Deal found 21/10C$ 654
Thu 12/113:45 p.m. -
Nonstop5h 09m
Wed 18/1110:40 a.m. -
Nonstop6h 23m
Deal found 21/10C$ 655
Wed 23/123:55 p.m. -
Nonstop5h 18m
Thu 31/127:30 a.m. -
Nonstop6h 35m
Deal found 22/10C$ 682
Thu 24/1211:15 p.m. -
Nonstop5h 21m
Mon 28/126:15 p.m. -
Nonstop6h 26m
Deal found 24/10C$ 689
Tue 22/123:55 p.m. -
Nonstop5h 17m
Wed 6/16:40 p.m. -
Nonstop6h 20m
Deal found 24/10C$ 703
Tue 22/123:55 p.m. -
Nonstop5h 18m
Sat 2/16:15 p.m. -
Nonstop6h 27m
Deal found 22/10C$ 717
Wed 23/123:35 p.m. -
Nonstop5h 24m
Tue 29/127:00 a.m. -
Nonstop6h 38m
Deal found 22/10C$ 724
Thu 17/123:45 p.m. -
Nonstop5h 17m
Sat 2/16:15 p.m. -
Nonstop6h 26m
Deal found 24/10C$ 745
Mon 9/1111:07 p.m. -
Nonstop5h 13m
Fri 13/1110:40 a.m. -
Nonstop6h 23m
Deal found 22/10C$ 748
Last-minute flights from Seattle to Boston
Discover last-minute flight deals from Seattle to Boston. Data last updated 26 October 2026 and is based on user searches.
Sat 7/119:05 a.m. -
1 stop9h 19m
Wed 11/111:29 p.m. -
1 stop8h 34m
Deal found 22/10C$ 493
Mon 9/115:30 a.m. -
1 stop13h 35m
Thu 12/116:30 p.m. -
1 stop9h 15m
Deal found 21/10C$ 462
Mon 9/1112:15 a.m. -
1 stop8h 45m
Tue 10/115:55 p.m. -
1 stop8h 40m
Deal found 21/10C$ 472
Mon 9/113:58 p.m. -
1 stop10h 48m
Fri 4/126:13 p.m. -
1 stop28h 05m
Deal found 25/10C$ 490
Thu 12/112:30 p.m. -
1 stop7h 16m
Sun 15/116:00 a.m. -
1 stop9h 19m
Deal found 21/10C$ 500
Fri 13/115:30 a.m. -
1 stop13h 35m
Thu 19/118:25 a.m. -
2 stops16h 15m
Deal found 23/10C$ 478
Sat 14/116:45 a.m. -
1 stop7h 25m
Mon 23/114:20 p.m. -
1 stop11h 15m
Deal found 23/10C$ 497
Wed 18/1111:20 a.m. -
1 stop7h 25m
Tue 8/124:40 p.m. -
1 stop9h 10m
Deal found 21/10C$ 437
Wed 18/116:30 a.m. -
1 stop6h 50m
Fri 4/125:55 p.m. -
1 stop8h 40m
Deal found 23/10C$ 455
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 26 October 2026.
Wed 11/117:59 p.m. -
1 stop17h 42m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 21/10C$ 293
Sun 6/1210:35 a.m. -
1 stop27h 33m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 25/10C$ 297
Wed 23/127:10 p.m. -
1 stop7h 44m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 25/10C$ 300
Tue 22/125:25 p.m. -
1 stop10h 20m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 25/10C$ 301
Sun 8/1111:15 p.m. -
1 stop8h 36m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 24/10C$ 303
Fri 1/16:30 a.m. -
1 stop12h 15m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 25/10C$ 308
Tue 1/1210:35 a.m. -
1 stop27h 34m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 23/10C$ 311
Fri 20/117:04 p.m. -
1 stop7h 50m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 25/10C$ 314
Mon 14/1210:35 a.m. -
1 stop27h 34m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 21/10C$ 315
Sat 19/129:09 p.m. -
1 stop29h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 24/10C$ 318
Thu 17/123:45 p.m. -
Nonstop5h 17m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 21/10C$ 328
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 26 October 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 26 October 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
Fri 1/1
6:30 a.m.-9:45 p.m.
1 stop12h 15m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 308
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Fri 20/11
2:30 p.m.-12:46 a.m.
1 stop7h 16m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 9/12
9:21 p.m.-5:40 a.m.
Nonstop5h 19m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sat 2/1
11:15 p.m.-7:36 a.m.
Nonstop5h 21m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Fri 1/1
8:51 a.m.-5:16 p.m.
Nonstop5h 25m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
Quickest round-trip
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Fri 18/12
3:45 p.m.-12:02 a.m.
Nonstop5h 17m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 7/12
9:21 p.m.-5:40 a.m.
Nonstop5h 19m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Fri 1/1
7:15 a.m.-3:42 p.m.
Nonstop5h 27m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 23/12
3:55 p.m.-12:12 a.m.
Nonstop5h 17m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 2/12
3:40 p.m.-11:59 p.m.
Nonstop5h 19m
Boston Logan Intl
Wed 31/12
12:00 a.m.-9:00 p.m.
Nonstop0h 00m
C$ 328
Flights are sorted by cheapest round-trip flights first.
Deals found on 25/10
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, May is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 538). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 787). 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 26 October 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 28% 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 below average for this route at the moment.
Seattle to Boston flights typically cost between C$ 513 and C$ 906 in December.The cheapest round-trip price found within the last 5 days was C$ 437 on Southwest (2 Dec-8 Dec).
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 26 October 2026.
The most flights from SEA to BOS are scheduled on a Saturday (26 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (9 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 176 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 Monday 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 13% 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 26 October 2026.
Get a feel of what it's like to fly with Alaska Airlines 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 15 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 33m for a nonstop flight. You can also purchase a plane ticket from 1 airline 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 20 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 is the cheapest airline to fly from Seattle to Boston round-trip?
Alaska Airlines, at C$ 214, was found to be the cheapest airline from Seattle to Boston.. You may be able to fly from Seattle to Boston for 65% less than the average price by searching for this airline.
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: LATAM Airlines (93%), Condor (91%), Scandinavian Airlines (87%).
What are the cheapest flights from Seattle to Boston?
While on average a flight from Seattle to Boston is generally C$ 313, our data shows the cheapest flight currently is C$ 273. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 654 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, May is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 538). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 787). 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
Braintree
Milford
Revere
Waltham
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 26 October 2026.
Discover the top airline 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 26 October 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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