$193+ Cheap flights from Seattle to Boston (SEA - BOS)
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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
Oct 5 — Oct 121
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Seattle to Boston with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 Tuesday or Wednesday and return on a Wednesday
Cheap flight deals from Seattle to Boston
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to BostonExplore 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 September 5, 2026.
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 September 5, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3011:42 pm -
Nonstop5h 24m
Tue 10/137:20 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$324
This Southwest deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1912:10 am -
1 stop8h 00m
Tue 11/31:10 pm -
2 stops12h 20m
Deal found 9/3![Southwest logo]()
$326
This KAYAK deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2911:42 pm -
Nonstop5h 24m
Sat 10/107:20 pm -
Nonstop6h 22m
Deal found 9/4![JetBlue logo]()
$332
This JetBlue deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3011:42 pm -
Nonstop5h 24m
Wed 10/147:20 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$333
This JetBlue deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2611:42 pm -
Nonstop5h 24m
Sat 10/37:20 pm -
Nonstop6h 17m
Deal found 9/2![JetBlue logo]()
$334
This Cheapflightsfares deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:42 pm -
Nonstop5h 24m
Wed 10/77:15 pm -
Nonstop6h 18m
Deal found 9/2![JetBlue logo]()
$336
This Southwest deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:10 am -
1 stop7h 40m
Mon 11/161:20 pm -
2 stops13h 10m
Deal found 9/3![Southwest logo]()
$342
This Priceline deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:59 pm -
1 stop11h 22m
Wed 10/147:20 pm -
Nonstop6h 22m
Deal found 9/2![Multiple Airlines logo]()
$343
This KAYAK deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1811:55 pm -
Nonstop5h 21m
Tue 10/207:20 pm -
Nonstop6h 22m
Deal found 9/3![JetBlue logo]()
$344
This JetBlue deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:42 pm -
Nonstop5h 24m
Wed 10/147:20 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$345
Best flights from Seattle to BostonDiscover 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 September 5, 2026.
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 September 5, 2026.
This United Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:00 am -
1 stop7h 37m
Tue 10/612:45 pm -
1 stop9h 07m
Deal found 9/3![United Airlines logo]()
$333
This Southwest deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/26:10 am -
1 stop7h 40m
Wed 12/94:40 pm -
1 stop8h 50m
Deal found 9/5![Southwest logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:07 pm -
1 stop19h 00m
Fri 10/169:03 am -
Nonstop6h 17m
Deal found 9/3![Alaska Airlines logo]()
$390
This Southwest deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/196:10 am -
2 stops12h 30m
Mon 11/234:20 pm -
1 stop11h 10m
Deal found 8/31![Southwest logo]()
$362
This Alaska Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:20 am -
1 stop16h 01m
Wed 10/146:40 pm -
Nonstop6h 19m
Deal found 9/1![Alaska Airlines logo]()
$390
This Southwest deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1211:10 am -
2 stops9h 40m
Mon 11/167:10 am -
1 stop8h 40m
Deal found 8/31![Southwest logo]()
$382
This Southwest deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/47:45 am -
2 stops11h 45m
Mon 11/910:20 am -
1 stop11h 55m
Deal found 9/4![Southwest logo]()
$385
This Alaska Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/109:20 pm -
Nonstop5h 20m
Sat 11/149:03 am -
Nonstop6h 24m
Deal found 9/4![Alaska Airlines logo]()
$427
This Southwest deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:15 am -
1 stop10h 05m
Wed 12/24:40 pm -
1 stop8h 50m
Deal found 9/2![Southwest logo]()
$388
This Alaska Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/119:20 pm -
Nonstop5h 20m
Tue 11/177:13 am -
Nonstop6h 26m
Deal found 9/4![Alaska Airlines logo]()
$427
This Alaska Airlines deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/89:20 pm -
Nonstop5h 20m
Fri 11/136:20 pm -
Nonstop6h 24m
Deal found 9/4![Alaska Airlines logo]()
$427
This Southwest deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1312:10 am -
2 stops11h 45m
Mon 10/194:50 pm -
1 stop10h 50m
Deal found 9/1![Southwest logo]()
$428
Last-minute flights from Seattle to BostonDiscover last-minute flight deals from Seattle to Boston. Data last updated September 5, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Boston. Data last updated September 5, 2026 and is based on user searches.
This JetBlue deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2611:42 pm -
Nonstop5h 24m
Sat 10/37:20 pm -
Nonstop6h 17m
Deal found 9/2![JetBlue logo]()
$334
This KAYAK deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2911:42 pm -
Nonstop5h 24m
Sat 10/107:20 pm -
Nonstop6h 22m
Deal found 9/4![JetBlue logo]()
$332
This Cheapflightsfares deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3011:42 pm -
Nonstop5h 24m
Tue 10/137:20 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$324
This JetBlue deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3011:42 pm -
Nonstop5h 24m
Wed 10/147:20 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$333
This Cheapflightsfares deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:42 pm -
Nonstop5h 24m
Sat 10/107:20 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$336
This JetBlue deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:42 pm -
Nonstop5h 24m
Wed 10/147:20 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$345
This Cheapflightsfares deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:42 pm -
Nonstop5h 24m
Mon 10/57:09 pm -
Nonstop6h 22m
Deal found 9/2![JetBlue logo]()
$348
This Priceline deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:59 pm -
1 stop11h 22m
Wed 10/147:20 pm -
Nonstop6h 22m
Deal found 9/2![Multiple Airlines logo]()
$343
This KAYAK deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1811:55 pm -
Nonstop5h 21m
Tue 10/207:20 pm -
Nonstop6h 22m
Deal found 9/3![JetBlue logo]()
$344
This Southwest deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1912:10 am -
1 stop8h 00m
Tue 11/31:10 pm -
2 stops12h 20m
Deal found 9/3![Southwest logo]()
$326
This Southwest deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1912:10 am -
2 stops11h 45m
Wed 10/282:50 pm -
2 stops10h 50m
Deal found 9/3![Southwest logo]()
$331
One-way flights from Seattle to BostonSearch for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated September 5, 2026.
Search for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated September 5, 2026.
This KAYAK deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:42 pm -
Nonstop5h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![JetBlue logo]()
$193
This KAYAK deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1610:48 pm -
1 stop8h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/31![American Airlines logo]()
$194
This iWofly deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1511:55 pm -
Nonstop5h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![JetBlue logo]()
$195
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/810:48 pm -
1 stop7h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![United Airlines logo]()
$196
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2711:13 pm -
1 stop7h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![United Airlines logo]()
$198
This American Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:13 am -
1 stop9h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![American Airlines logo]()
$199
This Southwest deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2512:15 am -
2 stops10h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Southwest logo]()
$201
This Alaska Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/73:58 pm -
1 stop10h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Alaska Airlines logo]()
$202
This Alaska Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/67:58 pm -
1 stop8h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Alaska Airlines logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/48:15 pm -
2 stops36h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:14 pm -
2 stops20h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$206
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 September 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $324 (Cheapflightsfares) |
One-way from | $193 (KAYAK) |
Popular in | December |
Cheapest in | September |
Average price | $372 |
Good round-trip deal | $406 or less |
Good one-way deal | $274 or less |
Cheapflights Fare Finder
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 September 5, 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
Cheapest round-trip
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 12/30
12:15 am-12:00 pm
1 stop8h 45m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$196
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Thu 10/22
2:10 pm-1:15 am
1 stop8h 05m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$196
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 11/2
12:15 am-3:50 pm
2 stops12h 35m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$201
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 10/5
4:54 pm-5:21 am
1 stop9h 27m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$204
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Tue 9/29
5:20 am-6:35 pm
2 stops10h 15m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$209
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Thu 11/19
6:30 am-4:25 pm
1 stop6h 55m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$212
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sun 11/15
11:07 pm-7:20 am
Nonstop5h 13m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$214
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 9/28
11:08 pm-7:40 am
Nonstop5h 32m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$214
Quickest round-trip
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 11/11
3:45 pm-11:54 pm
Nonstop5h 09m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$224
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Mon 10/19
11:10 pm-7:35 am
Nonstop5h 25m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$224
Showing 1-10 of 24 resultsSorted by cheapest first
Compare providers for flights from Seattle to Boston
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Boston in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Seattle-Boston flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Boston flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Boston flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Seattle-Boston flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Boston flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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 $372). Flying from Seattle to Boston in December is currently the most expensive (average of $542). 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 September 5, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 18% on flights from Seattle to Boston by exploring options for tickets at noon.
What is the cheapest day to fly from Seattle to Boston?
Use this chart to determine the cheapest time to fly round-trip from Seattle to Boston. Price data was last updated on August 29, 2026.
Travelers seeking maximum savings on their Seattle to Boston flight should consider departing on Thursday at noon when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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 last year, Delta have had the lowest number of delays on this route, with just 12% of flights being delayed.
The best insider tips for Seattle to Boston flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Boston trip
Our travel experts
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 September 5, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Seattle to Boston to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.0
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.0
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.0
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.0
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.0
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.0
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
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.
Traveling to a place near Boston?
Book flights to Boston if you plan to visit one of these locationsWaltham
Randolph
Concord
Cambridge
Brockton
Seekonk
Dedham
Cranston
Warwick
Pawtucket
Peabody
Auburn
Revere
York Beach
Londonderry
Fitchburg
North Falmouth
Swansea
Chelsea
Braintree
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Boston flight routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Seattle
Popular flights
Alternative routes for Seattle to Boston
See prices for flight routes from nearby airports that may be better suited for you.
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 September 5, 2026.
Complete your trip
Complete your trip to Boston by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Seattle to Boston by cabin class
Find flights from Seattle to Boston, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Boston flights
Browse other Seattle and Boston flight options. Last updated on September 5, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on September 5, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 8 airlines flying from Seattle to Boston
Discover the top 8 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 September 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$177 | Average$384 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$190 | Average$442 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$198 | Average$337 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$206 | Average$456 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$209 | Average$442 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$220 | Average$372 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$233 | Average$457 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$236 | Average$475 | FlexibilityNo cancel fee | On-time75% |