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 14/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
9 Oct — 16 Oct1
Round-trip
1 adult
Economy
Round-trip
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Boston Logan Intl to Seattle/Tacoma Intl are usually found in March or October, booked 64 days in advance, depart on a Thursday or Monday and return on a Sunday
Cheap flight deals from Boston to Seattle
Enter your travel dates to find the best prices.
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Cheapest flights from Boston to Seattle
Explore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 September 2026.
Fri 23/107:51 a.m. -
1 stop15h 35m
Fri 23/1011:00 p.m. -
Nonstop5h 26m
Deal found 6/9C$ 437
Sat 3/101:00 p.m. -
1 stop10h 44m
Tue 13/1010:15 p.m. -
1 stop9h 46m
Deal found 8/9C$ 445
Tue 6/107:03 a.m. -
Nonstop6h 17m
Tue 6/1011:31 a.m. -
1 stop14h 50m
Deal found 4/9C$ 451
Tue 29/97:20 p.m. -
Nonstop6h 17m
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Deal found 7/9C$ 459
Sat 3/107:20 p.m. -
Nonstop6h 17m
Sat 10/1011:55 p.m. -
Nonstop5h 21m
Deal found 7/9C$ 461
Sat 26/97:20 p.m. -
Nonstop6h 17m
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Deal found 4/9C$ 462
Tue 29/98:00 a.m. -
1 stop14h 52m
Tue 29/911:06 p.m. -
Nonstop5h 33m
Deal found 6/9C$ 476
Thu 29/107:51 a.m. -
1 stop15h 35m
Thu 29/1011:00 p.m. -
Nonstop5h 26m
Deal found 5/9C$ 479
Wed 21/107:51 a.m. -
1 stop10h 26m
Sat 24/107:04 a.m. -
1 stop19h 17m
Deal found 6/9C$ 487
Fri 23/107:51 a.m. -
1 stop16h 42m
Mon 26/104:54 p.m. -
1 stop9h 34m
Deal found 7/9C$ 490
Tue 20/102:50 p.m. -
2 stops12h 05m
Sat 24/1012:40 p.m. -
1 stop7h 40m
Deal found 7/9C$ 494
Tue 27/1010:35 a.m. -
1 stop12h 15m
Sat 31/105:30 a.m. -
1 stop10h 55m
Deal found 4/9C$ 495
Best flights from Boston to Seattle
Discover carefully curated flight deals from Boston to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 9 September 2026.
Sun 6/1210:20 a.m. -
1 stop11h 55m
Sat 12/128:20 a.m. -
1 stop7h 35m
Deal found 4/9C$ 535
Mon 9/116:20 p.m. -
Nonstop6h 24m
Wed 18/113:53 p.m. -
1 stop12h 27m
Deal found 9/9C$ 548
Fri 30/1010:50 a.m. -
1 stop13h 15m
Mon 2/1111:10 a.m. -
2 stops9h 40m
Deal found 7/9C$ 568
Sat 26/95:42 p.m. -
1 stop7h 57m
Sat 3/108:49 a.m. -
1 stop17h 32m
Deal found 4/9C$ 579
Thu 29/1010:40 a.m. -
2 stops13h 20m
Mon 2/1111:10 a.m. -
2 stops9h 40m
Deal found 7/9C$ 575
Wed 18/117:13 a.m. -
Nonstop6h 26m
Wed 2/128:21 a.m. -
Nonstop5h 25m
Deal found 4/9C$ 589
Sat 26/95:30 a.m. -
1 stop14h 10m
Sat 3/106:15 a.m. -
2 stops11h 15m
Deal found 5/9C$ 588
Direct flights from Boston to Seattle
Explore direct flight options from Boston to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 9 September 2026.
Tue 29/97:20 p.m. -
Nonstop6h 17m
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Deal found 7/9C$ 459
Sat 3/107:20 p.m. -
Nonstop6h 17m
Sat 10/1011:55 p.m. -
Nonstop5h 21m
Deal found 7/9C$ 461
Sat 26/97:20 p.m. -
Nonstop6h 17m
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Deal found 4/9C$ 462
Mon 28/97:20 p.m. -
Nonstop6h 17m
Tue 6/1011:41 p.m. -
Nonstop5h 21m
Deal found 7/9C$ 497
Mon 28/97:20 p.m. -
Nonstop6h 17m
Sun 4/1011:42 p.m. -
Nonstop5h 24m
Deal found 7/9C$ 534
Sat 26/97:20 p.m. -
Nonstop6h 17m
Thu 1/1011:42 p.m. -
Nonstop5h 24m
Deal found 4/9C$ 545
Thu 24/97:20 p.m. -
Nonstop6h 17m
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Deal found 6/9C$ 565
Mon 28/97:20 p.m. -
Nonstop6h 17m
Thu 1/1011:42 p.m. -
Nonstop5h 24m
Deal found 6/9C$ 582
Thu 29/104:58 p.m. -
Nonstop6h 19m
Sun 1/119:20 p.m. -
Nonstop5h 20m
Deal found 7/9C$ 589
Thu 24/97:20 p.m. -
Nonstop6h 17m
Fri 2/1011:42 p.m. -
Nonstop5h 24m
Deal found 6/9C$ 603
Mon 5/107:03 a.m. -
Nonstop6h 17m
Mon 5/103:32 p.m. -
Nonstop5h 27m
Deal found 7/9C$ 610
Last-minute flights from Boston to Seattle
Discover last-minute flight deals from Boston to Seattle. Data last updated 9 September 2026 and is based on user searches.
Sat 26/97:20 p.m. -
Nonstop6h 17m
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Deal found 4/9C$ 462
Tue 29/97:20 p.m. -
Nonstop6h 17m
Sat 3/1011:42 p.m. -
Nonstop5h 24m
Deal found 7/9C$ 459
Tue 29/98:00 a.m. -
1 stop14h 52m
Tue 29/911:06 p.m. -
Nonstop5h 33m
Deal found 6/9C$ 476
Sat 3/101:00 p.m. -
1 stop10h 44m
Tue 13/1010:15 p.m. -
1 stop9h 46m
Deal found 8/9C$ 445
Sat 3/107:20 p.m. -
Nonstop6h 17m
Sat 10/1011:55 p.m. -
Nonstop5h 21m
Deal found 7/9C$ 461
Tue 6/107:03 a.m. -
Nonstop6h 17m
Tue 6/1011:31 a.m. -
1 stop14h 50m
Deal found 4/9C$ 451
Tue 20/102:50 p.m. -
2 stops12h 05m
Sat 24/1012:40 p.m. -
1 stop7h 40m
Deal found 7/9C$ 494
Wed 21/107:51 a.m. -
1 stop10h 26m
Tue 27/1010:20 a.m. -
1 stop16h 08m
Deal found 6/9C$ 487
Fri 23/107:51 a.m. -
1 stop15h 35m
Fri 23/1011:00 p.m. -
Nonstop5h 26m
Deal found 6/9C$ 437
Fri 23/107:51 a.m. -
1 stop16h 42m
Mon 26/104:54 p.m. -
1 stop9h 34m
Deal found 7/9C$ 490
Tue 27/1010:35 a.m. -
1 stop12h 15m
Sat 31/105:30 a.m. -
1 stop10h 55m
Deal found 4/9C$ 495
Thu 29/107:51 a.m. -
1 stop15h 35m
Thu 29/1011:00 p.m. -
Nonstop5h 26m
Deal found 5/9C$ 479
One-way flights from Boston to Seattle
Search for one-way flight options from Boston to Seattle. Find affordable one-way fares based on user searches. Data last updated 9 September 2026.
Sat 14/1110:40 a.m. -
1 stop8h 25m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 237
Wed 28/107:20 a.m. -
1 stop8h 25m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 244
Sat 7/118:00 a.m. -
1 stop14h 10m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 6/9C$ 251
Wed 4/117:03 a.m. -
1 stop12h 53m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 6/9C$ 254
Fri 16/107:20 p.m. -
Nonstop6h 22m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 268
Thu 1/103:13 p.m. -
1 stop10h 43m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 8/9C$ 273
Fri 6/114:33 p.m. -
1 stop9h 27m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 6/9C$ 281
Tue 8/125:45 p.m. -
1 stop31h 22m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 286
Thu 26/1112:05 p.m. -
1 stop8h 35m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 287
Fri 16/102:35 p.m. -
2 stops13h 25m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 7/9C$ 288
Thu 19/117:10 a.m. -
1 stop8h 40m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 4/9C$ 292
Thu 15/104:58 p.m. -
Nonstop6h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 8/9C$ 294
Find flight deals from Boston to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Seattle (SEA). 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 9 September 2026.
Customize your flight search to find flights from Boston to Seattle 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 9 September 2026.
Use the filters below to find and compare flights from Boston to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest round-trip
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sat 7/11
8:00 a.m.-7:10 p.m.
1 stop14h 10m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 251
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Mon 16/11
4:33 p.m.-11:00 p.m.
1 stop9h 27m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 281
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Mon 11/1
7:10 a.m.-5:05 p.m.
2 stops12h 55m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 294
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Wed 3/3
6:32 p.m.-9:58 p.m.
Nonstop6h 26m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 295
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sun 6/12
9:20 a.m.-12:40 p.m.
Nonstop6h 20m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 295
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sat 31/10
9:03 a.m.-12:20 p.m.
Nonstop6h 17m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 295
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Fri 13/11
9:03 a.m.-12:27 p.m.
Nonstop6h 24m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 295
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Thu 1/10
12:55 p.m.-12:35 a.m.
2 stops14h 40m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 297
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Tue 1/12
3:30 p.m.-11:30 p.m.
2 stops11h 00m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 299
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Mon 11/1
7:05 a.m.-10:43 a.m.
Nonstop6h 38m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 309
Flights are sorted by cheapest round-trip flights first.
Deals found on 6/9
Showing 1-10 of 18 resultsSorted by cheapest first
1
2
Best time to book a flight from Boston to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Boston with our price prediction graph.
BOS-SEA
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 Boston to Seattle
Prices
Airlines
Delays
How far ahead should I book a flight from Boston to Seattle?
Booking 33 days in advance of your planned departure date is, on average, the best time to get cheap flights from Boston to Seattle. 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 Boston to Seattle?
Currently, March is the cheapest month in which you can book a flight from Boston to Seattle (average of C$ 488). Flying from Boston to Seattle in December is currently the most expensive (average of C$ 723). 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 BOS to SEA?
Find hourly flight availability from Boston to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 9 September 2026.
When flying from Boston to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How much does it cost to fly round-trip from Boston to Seattle?
Airfare is below average for this route at the moment.
Boston to Seattle flights typically cost between C$ 444 and C$ 701 in October.The cheapest round-trip price found within the last 5 days was C$ 437 on Alaska Airlines (23 Oct-23 Oct).
Weekly flight availability from Boston to Seattle
Explore weekly flight availability from Boston to Seattle. 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 9 September 2026.
The most flights from BOS to SEA are scheduled on a Monday (39 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 on average).
How often are flights from Boston to Seattle delayed?
About 17% of weekly flights between Boston and Seattle have experienced delays in the past year, with the average delay time being 164 minutes.
What is the most punctual flight time for Boston to Seattle flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Wednesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Boston to Seattle flights?
Over the past year, JetBlue has had the lowest number of delays on this route, with just 15% of flights being delayed.
Related info for your journey
Find useful and relevant information for your journey from Boston to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
How popular is this Boston to Seattle flight route?
Within the past month, 3 users have taken a look at flights from Boston Logan Intl to Seattle/Tacoma Intl.
How long is the flight from Boston to Seattle?
Airlines like Alaska Airlines and JetBlue fly from Boston to Seattle in about 10h 44m. The time it takes to get you to your destination can typically vary by up to 4h 51m. Boston and Seattle are separated by a distance of 4002 km. This flight may include one or multiple stops.
What are the most reliable airlines from Boston to Seattle?
No one likes to see their flight delayed. When booking a flight from Boston to Seattle consider choosing LATAM Airlines (91%), Korean Air (80%) or EL AL (79%) as they are the most reliable in getting you off to your destination on time.
Can I find deals for flights from Boston to Seattle that include hotel bookings?
Yes. In addition to deals on Boston to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Boston to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Seattle.
Can I find deals for business class flights from Boston to Seattle?
Yes. Cheapflights offers flight deals from Boston to Seattle 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 Boston to Seattle?
Currently, March is the cheapest month in which you can book a flight from Boston to Seattle (average of C$ 488). Flying from Boston to Seattle in December is currently the most expensive (average of C$ 723). 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.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 9 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 Boston to Seattle?
Deals for Boston to Seattle 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 Boston to Seattle?
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 Boston to Seattle.
Can Cheapflights find flights from Boston to Seattle with no change fees?
Cheapflights does show flights with no change fees to all users. To see these options for flights from Boston to Seattle, users can toggle the no change fees filter when performing a flight search.
Can Cheapflights notify me if prices for flights from Boston to Seattle become cheaper?
Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Boston today and book when prices fit your budget.
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