$212+ 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 12/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
Dec 5 — Dec 121
Round-trip
1 adult, Economy
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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 May or February, 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 November 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 November 5, 2026.
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:15 am -
1 stop12h 37m
Mon 12/76:15 am -
1 stop17h 34m
Deal found 11/2![Delta logo]()
$323
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 12/33:00 pm -
1 stop23h 08m
Tue 12/86:13 pm -
1 stop19h 14m
Deal found 11/3![Alaska Airlines logo]()
$338
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/67:15 am -
1 stop12h 37m
Thu 12/106:15 am -
1 stop17h 34m
Deal found 11/2![Delta logo]()
$343
This Alaska Airlines deal was found by Cheapflights users on 11/1. 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.
Mon 11/165:19 pm -
1 stop9h 27m
Fri 12/116:13 pm -
1 stop28h 05m
Deal found 11/1![Alaska Airlines logo]()
$350
This Alaska Airlines deal was found by Cheapflights users on 11/1. 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 12/18:09 pm -
1 stop18h 00m
Wed 12/166:13 pm -
1 stop18h 20m
Deal found 11/1![Alaska Airlines logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 11/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:19 pm -
1 stop9h 27m
Wed 11/184:33 pm -
1 stop9h 27m
Deal found 11/2![Alaska Airlines logo]()
$357
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Tue 12/18:09 pm -
1 stop18h 00m
Tue 12/86:13 pm -
1 stop28h 05m
Deal found 11/3![Alaska Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:20 am -
1 stop13h 05m
Sat 1/96:05 am -
1 stop13h 57m
Deal found 11/1![Delta logo]()
$363
This Alaska Airlines deal was found by Cheapflights users on 11/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/97:05 am -
1 stop31h 03m
Sat 12/126:13 pm -
1 stop18h 19m
Deal found 11/2![Alaska Airlines logo]()
$368
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 12/176:00 am -
1 stop20h 28m
Mon 1/45:47 pm -
1 stop32h 13m
Deal found 11/3![Alaska Airlines logo]()
$373
This United Airlines deal was found by Cheapflights users on 11/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/168:18 pm -
1 stop8h 38m
Mon 11/233:41 pm -
1 stop8h 58m
Deal found 11/2![United Airlines logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 11/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/138:09 pm -
1 stop17h 59m
Wed 12/166:13 pm -
1 stop27h 37m
Deal found 11/2![Alaska Airlines logo]()
$378
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 November 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 November 5, 2026.
This Alaska Airlines deal was found by Cheapflights users on 11/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:19 pm -
1 stop9h 27m
Wed 11/184:33 pm -
1 stop9h 27m
Deal found 11/2![Alaska Airlines logo]()
$357
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/183:45 pm -
Nonstop5h 17m
Sat 1/96:05 am -
1 stop13h 57m
Deal found 11/1![Delta logo]()
$395
This Southwest deal was found by Cheapflights users on 10/31. 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.
Wed 12/29:25 am -
2 stops9h 20m
Thu 12/31:20 pm -
2 stops12h 30m
Deal found 10/31![Southwest logo]()
$407
This Alaska Airlines deal was found by Cheapflights users on 11/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/311:09 pm -
Nonstop5h 31m
Sun 1/244:55 pm -
1 stop33h 05m
Deal found 11/2![Alaska Airlines logo]()
$425
This Southwest deal was found by Cheapflights users on 11/2. 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.
Sun 11/2212:15 am -
1 stop7h 55m
Tue 12/12:25 pm -
2 stops11h 25m
Deal found 11/2![Southwest logo]()
$453
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/23:45 pm -
Nonstop5h 17m
Fri 12/47:26 pm -
Nonstop6h 29m
Deal found 11/2![Delta logo]()
$467
This Alaska Airlines deal was found by Cheapflights users on 11/4. 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 1/67:15 pm -
1 stop17h 37m
Sun 1/107:00 am -
Nonstop6h 29m
Deal found 11/4![Alaska Airlines logo]()
$430
This Southwest deal was found by Cheapflights users on 10/31. 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.
Mon 12/215:25 pm -
1 stop10h 20m
Wed 12/306:30 pm -
1 stop9h 50m
Deal found 10/31![Southwest logo]()
$467
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/267:15 am -
Nonstop5h 27m
Tue 1/127:35 am -
Nonstop6h 29m
Deal found 11/1![Delta logo]()
$467
This Alaska Airlines deal was found by Cheapflights users on 10/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/188:51 am -
Nonstop5h 25m
Sun 1/36:19 pm -
Nonstop6h 41m
Deal found 10/31![Alaska Airlines logo]()
$467
This Delta deal was found by Cheapflights users on 10/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/231:40 pm -
Nonstop5h 10m
Fri 11/275:45 am -
1 stop7h 57m
Deal found 10/31![Delta logo]()
$512
This Delta deal was found by Cheapflights users on 10/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2411:15 pm -
Nonstop5h 21m
Sat 1/27:30 am -
Nonstop6h 33m
Deal found 10/31![Delta logo]()
$522
Last-minute flights from Seattle to BostonDiscover last-minute flight deals from Seattle to Boston. Data last updated November 5, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Boston. Data last updated November 5, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 11/1. 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.
Mon 11/165:19 pm -
1 stop9h 27m
Fri 12/116:13 pm -
1 stop28h 05m
Deal found 11/1![Alaska Airlines logo]()
$350
This Alaska Airlines deal was found by Cheapflights users on 11/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:19 pm -
1 stop9h 27m
Wed 11/184:33 pm -
1 stop9h 27m
Deal found 11/2![Alaska Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 11/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/168:18 pm -
1 stop8h 38m
Mon 11/233:41 pm -
1 stop8h 58m
Deal found 11/2![United Airlines logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 11/1. 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 12/18:09 pm -
1 stop18h 00m
Wed 12/166:13 pm -
1 stop18h 20m
Deal found 11/1![Alaska Airlines logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Tue 12/18:09 pm -
1 stop18h 00m
Wed 12/96:13 pm -
1 stop30h 44m
Deal found 11/3![Alaska Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:15 am -
1 stop12h 37m
Mon 12/76:15 am -
1 stop17h 34m
Deal found 11/2![Delta logo]()
$323
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 12/37:05 am -
1 stop31h 03m
Wed 12/96:13 pm -
1 stop18h 19m
Deal found 11/3![Alaska Airlines logo]()
$338
This Alaska Airlines deal was found by Cheapflights users on 11/5. 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.
Thu 12/37:20 am -
2 stops30h 48m
Thu 12/106:13 pm -
1 stop18h 19m
Deal found 11/5![Alaska Airlines logo]()
$371
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/67:15 am -
1 stop12h 37m
Thu 12/106:15 am -
1 stop17h 34m
Deal found 11/2![Delta logo]()
$343
This Alaska Airlines deal was found by Cheapflights users on 11/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/97:05 am -
1 stop31h 03m
Sat 12/126:13 pm -
1 stop18h 19m
Deal found 11/2![Alaska Airlines logo]()
$368
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:20 am -
1 stop13h 05m
Thu 1/76:05 am -
1 stop13h 57m
Deal found 11/1![Delta logo]()
$363
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 12/176:00 am -
1 stop20h 28m
Mon 1/45:47 pm -
1 stop32h 13m
Deal found 11/3![Alaska Airlines logo]()
$373
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 November 5, 2026.
Search for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated November 5, 2026.
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 12/176:00 am -
1 stop20h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Alaska Airlines logo]()
$212
This Southwest deal was found by Cheapflights users on 11/3. 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.
Sun 1/312:15 am -
1 stop7h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Southwest logo]()
$215
This Southwest deal was found by Cheapflights users on 11/2. 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.
Tue 12/298:30 pm -
2 stops11h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Southwest logo]()
$220
This United Airlines deal was found by Cheapflights users on 11/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/1310:53 am -
2 stops10h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![United Airlines logo]()
$224
This United Airlines deal was found by Cheapflights users on 11/1. 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.
Tue 3/99:02 am -
1 stop9h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![United Airlines logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 11/1. 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 12/189:09 pm -
1 stop29h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Alaska Airlines logo]()
$232
This Alaska Airlines deal was found by Cheapflights users on 11/3. 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.
Tue 3/98:38 am -
Nonstop5h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Alaska Airlines logo]()
$234
This Mytrip deal was found by Cheapflights users on 11/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1911:09 pm -
Nonstop5h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Alaska Airlines logo]()
$236
This Alaska Airlines deal was found by Cheapflights users on 11/5. 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.
Wed 12/239:09 pm -
1 stop16h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Alaska Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 11/3. 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.
Sun 12/208:30 pm -
2 stops11h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Southwest logo]()
$239
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 November 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $323 (Delta) |
One-way from | $212 (Alaska Airlines) |
Popular in | December |
Cheapest in | May |
Average price | $542 |
Good round-trip deal | $447 or less |
Good one-way deal | $240 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 November 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
Thu 12/17
6:00 am-5:28 am
1 stop20h 28m
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
Fri 12/18
9:09 pm-5:28 am
1 stop29h 19m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$232
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Tue 12/1
6:30 am-4:20 pm
1 stop6h 50m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Fri 1/8
10:33 pm-6:51 am
Nonstop5h 18m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sat 4/24
10:40 pm-9:24 am
1 stop7h 44m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
Quickest round-trip
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sun 12/13
3:45 pm-12:02 am
Nonstop5h 17m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sun 1/17
8:08 am-7:08 pm
1 stop8h 00m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Sat 12/26
7:15 am-3:42 pm
Nonstop5h 27m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Wed 11/25
6:30 am-5:27 pm
1 stop7h 57m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
SeattleBoston
SEA Seattle/Tacoma Intl - BOS Boston Logan Intl
SEABOS
Seattle/Tacoma Intl
Thu 12/31
7:15 am-3:42 pm
Nonstop5h 27m
Boston Logan Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$234
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 November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*1 star |
- 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, May is the cheapest month in which you can book a flight from Seattle to Boston (average of $384). Flying from Seattle to Boston in December is currently the most expensive (average of $560). 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 November 5, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 18% on flights from Seattle to Boston by exploring options for tickets in the evening.
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 October 31, 2026.
Travelers seeking maximum savings on their Seattle to Boston flight should consider departing on Friday at noon when fares are most often at their lowest. Sunday at noon 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 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 last year, Delta have had the lowest number of delays on this route, with just 13% 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 November 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.
Crew
8.5
Entertainment
7.0
Comfort
7.8
Food
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Crew
8.5
Entertainment
7.0
Comfort
7.8
Food
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Crew
8.5
Entertainment
7.0
Comfort
7.8
Food
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Crew
8.5
Entertainment
7.0
Comfort
7.8
Food
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Crew
8.5
Entertainment
7.0
Comfort
7.8
Food
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Crew
8.5
Entertainment
7.0
Comfort
7.8
Food
7.0
Overall
7.9
Boarding
8.1
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
Dedham
Cranston
Warwick
Pawtucket
Peabody
Fitchburg
Londonderry
York Beach
Revere
North Falmouth
Chelsea
Swansea
Braintree
Auburn
Sandwich
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Other flights to Boston
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Complete your trip
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Seattle and Boston flights
Browse other Seattle and Boston flight options. Last updated on November 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 November 5, 2026.
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Top 7 airlines flying from Seattle to Boston
Discover the top 7 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 November 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$197 | Average$397 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$200 | Average$470 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$209 | Average$454 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$220 | Average$391 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$233 | Average$457 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$247 | Average$496 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$256 | Average$502 | FlexibilityNo cancel fee | On-time71% |