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 15/1. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
24 Nov — 1 Dec1
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 May, booked 85 days in advance, depart on a Monday or Tuesday and return on a Friday
Cheap flight deals from Boston to Seattle
Enter your travel dates to find the best prices.
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Best
Direct
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One-way
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 25 October 2026.
Sat 14/119:03 a.m. -
Nonstop6h 24m
Sat 14/113:58 p.m. -
1 stop10h 48m
Deal found 21/10C$ 479
Thu 10/126:13 p.m. -
1 stop30h 44m
Mon 14/123:00 p.m. -
1 stop23h 09m
Deal found 25/10C$ 480
Fri 13/116:09 p.m. -
1 stop21h 19m
Mon 16/1111:43 a.m. -
1 stop15h 03m
Deal found 24/10C$ 487
Fri 13/117:03 a.m. -
1 stop10h 42m
Fri 13/115:19 p.m. -
1 stop9h 27m
Deal found 21/10C$ 492
Wed 4/111:29 p.m. -
1 stop8h 34m
Sat 7/119:05 a.m. -
1 stop9h 19m
Deal found 21/10C$ 493
Mon 9/117:03 a.m. -
1 stop12h 53m
Sat 14/115:19 p.m. -
1 stop9h 27m
Deal found 21/10C$ 500
Wed 11/115:55 p.m. -
1 stop8h 40m
Sun 15/1112:15 a.m. -
2 stops11h 15m
Deal found 23/10C$ 504
Thu 10/126:13 p.m. -
1 stop30h 44m
Thu 17/129:09 p.m. -
1 stop29h 19m
Deal found 25/10C$ 508
Tue 10/115:55 p.m. -
1 stop8h 40m
Mon 30/1112:15 a.m. -
1 stop8h 45m
Deal found 23/10C$ 514
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 25 October 2026.
Thu 7/15:05 a.m. -
1 stop9h 05m
Thu 7/11:05 p.m. -
1 stop7h 40m
Deal found 20/10C$ 560
Mon 9/117:03 a.m. -
1 stop12h 53m
Wed 18/118:47 a.m. -
Nonstop5h 30m
Deal found 22/10C$ 577
Fri 20/113:30 p.m. -
2 stops12h 50m
Sun 22/1112:15 a.m. -
1 stop7h 55m
Deal found 25/10C$ 563
Mon 16/116:09 p.m. -
1 stop19h 44m
Sat 21/117:56 p.m. -
1 stop7h 24m
Deal found 23/10C$ 591
Fri 27/117:00 a.m. -
Nonstop6h 28m
Wed 2/127:05 a.m. -
1 stop31h 03m
Deal found 21/10C$ 630
Thu 10/127:00 a.m. -
Nonstop6h 38m
Mon 14/128:09 p.m. -
1 stop18h 00m
Deal found 22/10C$ 634
Thu 3/126:13 p.m. -
1 stop29h 43m
Sun 6/128:09 p.m. -
1 stop17h 59m
Deal found 22/10C$ 634
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 25 October 2026.
Thu 12/119:03 a.m. -
Nonstop6h 24m
Thu 12/113:36 p.m. -
Nonstop5h 22m
Deal found 21/10C$ 647
Thu 24/126:19 p.m. -
Nonstop6h 41m
Sun 3/111:09 p.m. -
Nonstop5h 31m
Deal found 21/10C$ 654
Thu 31/127:00 a.m. -
Nonstop6h 38m
Sun 3/111:09 p.m. -
Nonstop5h 31m
Deal found 24/10C$ 668
Mon 7/1210:40 a.m. -
Nonstop6h 29m
Wed 9/123:45 p.m. -
Nonstop5h 17m
Deal found 23/10C$ 669
Thu 11/26:30 p.m. -
Nonstop6h 34m
Mon 15/210:00 p.m. -
Nonstop5h 33m
Deal found 22/10C$ 682
Thu 12/117:25 p.m. -
Nonstop6h 30m
Wed 18/1111:07 p.m. -
Nonstop5h 13m
Deal found 22/10C$ 683
Fri 13/113:45 p.m. -
Nonstop6h 21m
Thu 19/1111:45 a.m. -
Nonstop5h 16m
Deal found 23/10C$ 685
Sun 20/126:15 p.m. -
Nonstop6h 26m
Mon 28/1211:15 p.m. -
Nonstop5h 21m
Deal found 24/10C$ 689
Sun 20/126:15 p.m. -
Nonstop6h 26m
Tue 26/17:20 a.m. -
Nonstop5h 30m
Deal found 25/10C$ 703
Fri 20/117:50 a.m. -
Nonstop6h 27m
Sun 22/1111:07 p.m. -
Nonstop5h 13m
Deal found 22/10C$ 717
Wed 23/127:00 a.m. -
Nonstop6h 38m
Mon 28/128:51 a.m. -
Nonstop5h 25m
Deal found 21/10C$ 724
Sun 22/117:50 a.m. -
Nonstop6h 27m
Fri 27/117:38 a.m. -
Nonstop5h 22m
Deal found 20/10C$ 731
Last-minute flights from Boston to Seattle
Discover last-minute flight deals from Boston to Seattle. Data last updated 25 October 2026 and is based on user searches.
Wed 4/111:29 p.m. -
1 stop8h 34m
Sat 7/119:05 a.m. -
1 stop9h 19m
Deal found 21/10C$ 493
Sun 8/116:00 a.m. -
1 stop9h 19m
Mon 9/1110:56 p.m. -
1 stop8h 23m
Deal found 24/10C$ 518
Mon 9/117:03 a.m. -
1 stop12h 53m
Sat 14/115:19 p.m. -
1 stop9h 27m
Deal found 21/10C$ 500
Tue 10/115:55 p.m. -
1 stop8h 40m
Mon 30/1112:15 a.m. -
1 stop8h 45m
Deal found 23/10C$ 514
Wed 11/115:55 p.m. -
1 stop8h 40m
Sun 15/1112:15 a.m. -
2 stops11h 15m
Deal found 23/10C$ 504
Fri 13/116:09 p.m. -
1 stop21h 19m
Mon 16/1111:43 a.m. -
1 stop15h 03m
Deal found 24/10C$ 487
Fri 13/117:03 a.m. -
1 stop10h 42m
Fri 13/115:19 p.m. -
1 stop9h 27m
Deal found 21/10C$ 492
Sat 14/119:03 a.m. -
Nonstop6h 24m
Sat 14/113:58 p.m. -
1 stop10h 48m
Deal found 21/10C$ 479
Thu 19/117:03 a.m. -
1 stop13h 52m
Tue 1/128:09 p.m. -
1 stop18h 00m
Deal found 25/10C$ 480
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 25 October 2026.
Fri 15/16:35 p.m. -
1 stop9h 00m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 21/10C$ 280
Fri 4/126:13 p.m. -
1 stop18h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 24/10C$ 283
Sun 15/116:00 a.m. -
1 stop9h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 23/10C$ 284
Thu 26/1110:05 a.m. -
2 stops10h 35m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 23/10C$ 286
Thu 3/126:13 p.m. -
1 stop18h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 24/10C$ 290
Tue 5/18:25 a.m. -
2 stops16h 15m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 24/10C$ 294
Wed 25/111:29 p.m. -
1 stop8h 34m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 25/10C$ 300
Tue 1/125:55 p.m. -
1 stop8h 40m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 23/10C$ 301
Sun 8/111:29 p.m. -
1 stop8h 34m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 24/10C$ 302
Thu 17/1212:55 p.m. -
2 stops13h 10m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 24/10C$ 308
Mon 7/126:13 p.m. -
1 stop18h 19m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 23/10C$ 311
Thu 17/1211:45 a.m. -
1 stop8h 33m
Wed 31/1212:00 a.m. -
Nonstop0h 00m
Deal found 22/10C$ 312
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 25 October 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 25 October 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
Tue 1/12
7:26 p.m.-10:55 p.m.
Nonstop6h 29m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 328
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Wed 25/11
1:29 p.m.-7:03 p.m.
1 stop8h 34m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 328
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Tue 24/11
9:45 a.m.-4:27 p.m.
1 stop9h 42m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 328
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Fri 4/12
4:56 p.m.-10:43 p.m.
1 stop8h 47m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 342
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Thu 17/12
10:40 a.m.-2:09 p.m.
Nonstop6h 29m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 342
Quickest round-trip
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sat 14/11
7:50 a.m.-11:17 a.m.
Nonstop6h 27m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 342
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sun 7/2
6:30 p.m.-10:04 p.m.
Nonstop6h 34m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 342
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Fri 6/11
1:32 p.m.-12:59 a.m.
2 stops14h 27m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 349
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sat 7/11
9:12 a.m.-6:46 p.m.
2 stops12h 34m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 349
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Wed 10/2
6:00 a.m.-9:02 p.m.
3 stops18h 02m
Seattle/Tacoma Intl
Wed 31/12
12:00 a.m.-3:00 a.m.
Nonstop0h 00m
C$ 384
Flights are sorted by cheapest round-trip flights first.
Deals found on 20/10
Showing 1-10 of 19 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 84 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$ 499). Flying from Boston to Seattle in December is currently the most expensive (average of C$ 742). 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 25 October 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$ 534 and C$ 831 in November.The cheapest round-trip price found within the last 5 days was C$ 479 on Alaska Airlines (14 Nov-14 Nov).
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 25 October 2026.
The most flights from BOS to SEA are scheduled on a Saturday (28 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 on average).
How often are flights from Boston to Seattle delayed?
About 18% of weekly flights between Boston and Seattle have experienced delays in the past year, with the average delay time being 159 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, Delta has had the lowest number of delays on this route, with just 16% 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 Southwest and Alaska Airlines fly from Boston to Seattle in about 9h 05m. The time it takes to get you to your destination can typically vary by up to 3h 48m. 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 KLM (100%), LATAM Airlines (75%) or EL AL (73%) 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$ 499). Flying from Boston to Seattle in December is currently the most expensive (average of C$ 742). 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 25 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 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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