This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
5 Dec — 12 Dec1
Return
1 adult
Economy
Return
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 Wednesday or Tuesday and return on a Monday
Cheap flight deals from Boston to Seattle
Enter your travel dates to find the best prices.
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Best
Direct
Last-minute
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 5 November 2026.
Thu 10/1209:00 -
Nonstop6h 37m
Thu 10/1215:00 -
1 stop23h 08m
Deal found 4/11£224
Thu 3/1209:00 -
Nonstop6h 37m
Thu 3/1215:00 -
1 stop23h 08m
Deal found 3/11£226
Wed 2/1209:00 -
Nonstop6h 37m
Wed 2/1215:00 -
1 stop23h 08m
Deal found 3/11£228
Thu 3/1218:13 -
1 stop30h 44m
Fri 11/1220:09 -
1 stop17h 59m
Deal found 4/11£240
Thu 3/1218:13 -
1 stop29h 43m
Thu 10/1207:05 -
1 stop31h 03m
Deal found 3/11£251
Sat 14/1116:33 -
Nonstop6h 26m
Sun 15/1107:13 -
1 stop19h 33m
Deal found 1/11£254
Mon 7/1218:13 -
1 stop18h 19m
Thu 10/1207:05 -
1 stop31h 03m
Deal found 4/11£255
Wed 18/1116:33 -
1 stop9h 27m
Wed 2/1209:12 -
1 stop28h 56m
Deal found 4/11£260
Tue 17/1113:51 -
1 stop9h 56m
Wed 18/1105:05 -
1 stop7h 30m
Deal found 3/11£261
Sun 13/1218:13 -
1 stop18h 19m
Mon 21/1221:09 -
1 stop29h 19m
Deal found 2/11£262
Thu 3/1218:13 -
1 stop18h 19m
Wed 9/1212:18 -
1 stop25h 50m
Deal found 4/11£266
Thu 3/1218:13 -
1 stop29h 43m
Sun 13/1212:18 -
1 stop25h 50m
Deal found 2/11£273
Best flights from Boston to Seattle
Discover carefully curated flight deals from Boston to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 November 2026.
Wed 16/1218:13 -
1 stop25h 54m
Wed 23/1221:09 -
1 stop16h 35m
Deal found 1/11£266
Wed 2/1213:20 -
2 stops12h 30m
Wed 9/1211:20 -
1 stop7h 25m
Deal found 4/11£298
Sun 11/407:22 -
Nonstop6h 38m
Sat 17/422:00 -
Nonstop5h 33m
Deal found 3/11£347
Wed 2/1218:13 -
1 stop29h 43m
Tue 8/1220:09 -
1 stop18h 00m
Deal found 1/11£291
Tue 8/1214:25 -
2 stops11h 25m
Wed 9/1209:25 -
2 stops9h 20m
Deal found 3/11£302
Wed 3/218:14 -
1 stop28h 43m
Sun 7/221:20 -
Nonstop5h 20m
Deal found 31/10£293
Fri 4/1218:13 -
1 stop28h 05m
Fri 11/1215:40 -
Nonstop5h 19m
Deal found 4/11£297
Sun 20/1217:00 -
2 stops11h 45m
Mon 21/1205:15 -
1 stop16h 35m
Deal found 4/11£327
Sun 6/1216:56 -
1 stop8h 47m
Tue 8/1215:00 -
1 stop23h 09m
Deal found 4/11£312
Tue 1/1207:00 -
Nonstop6h 38m
Sat 5/1209:00 -
Nonstop5h 19m
Deal found 3/11£347
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 5 November 2026.
Wed 2/1218:22 -
Nonstop6h 38m
Wed 9/1221:21 -
Nonstop5h 19m
Deal found 4/11£329
Wed 2/1209:00 -
Nonstop6h 37m
Wed 2/1215:40 -
Nonstop5h 19m
Deal found 3/11£343
Thu 24/1218:19 -
Nonstop6h 41m
Thu 31/1223:09 -
Nonstop5h 31m
Deal found 3/11£347
Thu 26/1107:50 -
Nonstop6h 30m
Wed 2/1215:45 -
Nonstop5h 17m
Deal found 3/11£349
Tue 1/1219:26 -
Nonstop6h 29m
Mon 14/1215:45 -
Nonstop5h 17m
Deal found 4/11£354
Sun 20/1218:19 -
Nonstop6h 41m
Sun 27/1223:09 -
Nonstop5h 31m
Deal found 5/11£374
Tue 22/1210:50 -
Nonstop6h 29m
Mon 28/1223:15 -
Nonstop5h 21m
Deal found 3/11£384
Mon 23/1107:50 -
Nonstop6h 30m
Tue 1/1222:52 -
Nonstop5h 27m
Deal found 2/11£385
Tue 22/1218:15 -
Nonstop6h 26m
Tue 29/1223:15 -
Nonstop5h 21m
Deal found 31/10£387
Thu 19/1107:50 -
Nonstop6h 27m
Tue 1/1222:52 -
Nonstop5h 27m
Deal found 3/11£399
Last-minute flights from Boston to Seattle
Discover last-minute flight deals from Boston to Seattle. Data last updated 5 November 2026 and is based on user searches.
Sat 14/1116:33 -
Nonstop6h 26m
Sun 15/1107:13 -
1 stop19h 33m
Deal found 1/11£254
Tue 17/1113:51 -
1 stop9h 56m
Wed 18/1105:05 -
1 stop7h 30m
Deal found 3/11£261
Wed 18/1116:33 -
1 stop9h 27m
Wed 2/1209:12 -
1 stop28h 56m
Deal found 4/11£260
Wed 2/1209:00 -
Nonstop6h 37m
Wed 2/1215:00 -
1 stop23h 08m
Deal found 3/11£228
Thu 3/1209:00 -
Nonstop6h 37m
Thu 3/1215:00 -
1 stop23h 08m
Deal found 3/11£226
Thu 3/1218:13 -
1 stop30h 44m
Fri 11/1220:09 -
1 stop17h 59m
Deal found 4/11£240
Thu 3/1218:13 -
1 stop29h 43m
Thu 10/1207:05 -
1 stop31h 03m
Deal found 3/11£251
Thu 3/1218:13 -
1 stop18h 19m
Wed 9/1212:18 -
1 stop25h 50m
Deal found 4/11£266
Thu 3/1218:13 -
1 stop29h 43m
Sun 13/1212:18 -
1 stop25h 50m
Deal found 2/11£273
Mon 7/1218:13 -
1 stop18h 19m
Tue 8/1217:51 -
1 stop20h 18m
Deal found 4/11£255
Thu 10/1209:00 -
Nonstop6h 37m
Thu 10/1215:00 -
1 stop23h 08m
Deal found 4/11£224
Sun 13/1218:13 -
1 stop18h 19m
Mon 21/1221:09 -
1 stop29h 19m
Deal found 2/11£262
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 5 November 2026.
Sat 5/1208:27 -
2 stops15h 54m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£148
Thu 17/1207:40 -
1 stop12h 27m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/11£150
Thu 26/1108:40 -
2 stops13h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£151
Fri 29/116:55 -
1 stop26h 52m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£154
Mon 16/1118:09 -
1 stop19h 44m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£155
Thu 17/1205:00 -
2 stops16h 00m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£156
Fri 11/1218:13 -
1 stop30h 44m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£157
Wed 25/1115:01 -
1 stop11h 06m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 31/10£159
Thu 17/1211:45 -
1 stop14h 04m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£162
Tue 1/1214:25 -
2 stops11h 25m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£163
Sat 12/1207:30 -
1 stop15h 15m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£168
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 5 November 2026.
Customise 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 5 November 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 return flight
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sat 16/1
08:25-16:55
1 stop11h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£148
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Tue 9/2
08:10-17:40
2 stops12h 30m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£151
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Fri 29/1
16:55-16:47
1 stop26h 52m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£154
Fastest return journey
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Wed 17/2
18:35-22:04
Nonstop6h 29m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£174
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Fri 11/12
10:40-14:09
Nonstop6h 29m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£174
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Sat 19/12
18:55-00:45
1 stop8h 50m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£174
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Tue 15/12
07:50-11:21
Nonstop6h 31m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£174
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Tue 1/12
07:10-12:50
1 stop8h 40m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£174
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Thu 3/12
09:00-12:37
Nonstop6h 37m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£177
BostonSeattle
BOS Boston Logan Intl - SEA Seattle/Tacoma Intl
BOSSEA
Boston Logan Intl
Tue 1/12
07:50-11:21
Nonstop6h 31m
Seattle/Tacoma Intl
Wed 31/12
00:00-03:00
Nonstop0h 00m
£177
Flights are sorted by cheapest return flights first.
Deals found on 2/11
Showing 1-10 of 22 resultsSorted by cheapest first
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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 return 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?
The best time to book flights from Boston to Seattle is 84 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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 £266). Flying from Boston to Seattle in December is currently the most expensive (average of £393). 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 5 November 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Boston to Seattle as you normally would.
How much does it cost for a return flight from Boston to Seattle?
Airfare is below average for this route at the moment.
Boston to Seattle flights typically cost between £312 and £503 in December.The cheapest return price found within the last 5 days was £224 on Alaska Airlines (10 Dec–10 Dec).
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 5 November 2026.
The most flights from BOS to SEA are scheduled on a Tuesday (25 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (6 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 have 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?
The Boston Logan Intl to Seattle/Tacoma Intl flight path was viewed by 3 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 Boston to Seattle?
Airlines like Alaska Airlines fly from Boston to Seattle in about 25h 54m. The time it takes to get you to your destination can typically vary by up to . The distance between Boston and Seattle is about 2487 mi.
What are the most reliable airlines from Boston to Seattle?
Consider KLM (83%), Aer Lingus (81%) or JetBlue (81%) when booking your flight. These represent the most reliable airlines when flying from Boston to Seattle.
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 holiday 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 £266). Flying from Boston to Seattle in December is currently the most expensive (average of £393). 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 5 November 2026.
Find the best flight deals on Cheapflights, where travellers 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?
When you search for this flight from Boston to Seattle, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Why should you use Cheapflights to find cheap flight tickets from Boston to Seattle?
Millions of users choose and trust Cheapflights to book the best flight deals from Boston to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
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?
Of course! You can now track prices for flights from Boston to Seattle and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.
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