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$371+ Cheap flights from Seattle to Nantucket (SEA - ACK)

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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ACK
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap flight deals from Seattle to Nantucket

Cheapest flights from Seattle to Nantucket
Explore the most affordable flight options available from Seattle to Nantucket. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.

This Priceline deal was found by Cheapflights users on 2/11. 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.
Thu 8/2711:41 pm
SEA
-
ACK
1 stop7h 44m
JetBlue
Sun 8/3012:02 pm
ACK
-
SEA
1 stop12h 03m
JetBlue
Deal found 2/11$371
This JetBlue deal was found by Cheapflights users on 2/8. 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.
Thu 8/2711:41 pm
SEA
-
ACK
1 stop10h 20m
JetBlue
Mon 8/313:43 pm
ACK
-
SEA
1 stop10h 03m
JetBlue
Deal found 2/8$395
This American Airlines deal was found by Cheapflights users on 2/11. 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.
Wed 8/2612:34 am
SEA
-
ACK
2 stops13h 00m
American Airlines
Mon 8/311:38 pm
ACK
-
SEA
2 stops12h 17m
American Airlines
Deal found 2/11$585
This American Airlines deal was found by Cheapflights users on 2/11. 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.
Wed 8/2612:34 am
SEA
-
ACK
2 stops13h 00m
American Airlines
Sun 8/305:13 pm
ACK
-
SEA
1 stop10h 48m
American Airlines
Deal found 2/11$600
This Expedia deal was found by Cheapflights users on 2/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/1610:40 pm
SEA
-
ACK
1 stop10h 00m
Multiple Airlines
Fri 3/201:30 pm
ACK
-
SEA
1 stop11h 04m
Multiple Airlines
Deal found 2/9$794
This Delta deal was found by Cheapflights users on 2/9. 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 6/2811:53 pm
SEA
-
ACK
2 stops10h 34m
Delta
Sat 7/42:10 pm
ACK
-
SEA
1 stop11h 06m
Delta
Deal found 2/9$814
This Delta deal was found by Cheapflights users on 2/11. 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 8/276:00 am
SEA
-
ACK
2 stops9h 05m
Delta
Mon 8/312:10 pm
ACK
-
SEA
1 stop11h 06m
Delta
Deal found 2/11$904
This United Airlines deal was found by Cheapflights users on 2/9. 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 6/2810:40 pm
SEA
-
ACK
2 stops13h 11m
United Airlines
Sat 7/410:18 am
ACK
-
SEA
3 stops16h 03m
United Airlines
Deal found 2/9$922

Find flight deals from Seattle to Nantucket

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Nantucket (ACK). 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 February 11, 2026.

Most accurate provider

Expedia
1 star

Most trusted provider

Expedia
3 stars

Round-trip from

$794
(Expedia)

Popular in

December

Cheapest in

March

Average price

$357
Provider with most accurate pricing for Seattle/Tacoma Intl-Nantucket Memorial flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Nantucket Memorial flights.
Search Deals
From Seattle/Tacoma Intl to Nantucket Memorial
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Nantucket 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 2,558,603 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from Seattle to Nantucket that are best for you.

Fly from

Seattle

Fly to

Nantucket

Route

Depart

Return

Price

SeattleNantucket

SEA - ACK

SEAACK

Seattle/Tacoma Intl

Mon 3/16

10:40 pm-11:40 am

1 stop10h 00m

Nantucket Memorial

Fri 3/20

1:30 pm-9:34 pm

1 stop11h 04m

$794

SeattleNantucket

SEA - ACK

SEAACK

Seattle/Tacoma Intl

Sun 6/28

11:53 pm-1:27 pm

2 stops10h 34m

Nantucket Memorial

Sat 7/4

2:10 pm-10:16 pm

1 stop11h 06m

$814

SeattleNantucket

SEA - ACK

SEAACK

Seattle/Tacoma Intl

Sun 6/28

10:40 pm-2:51 pm

2 stops13h 11m

Nantucket Memorial

Sat 7/4

10:18 am-11:21 pm

3 stops16h 03m

$922

SeattleNantucket

SEA - ACK

SEAACK

Seattle/Tacoma Intl

Sun 6/28

11:15 pm-9:15 am

1 stop7h 00m

Nantucket Memorial

Sat 7/4

3:43 pm-10:46 pm

1 stop10h 03m

$995

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

  • Most accurate provider: When it comes to deals on Seattle-Nantucket flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on Seattle-Nantucket flight deals on Cheapflights vs. Expedia <90% of the time. Price accuracy is based on data collected from Seattle-Nantucket flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Nantucket flights, Cheapflights users trust Expedia the most. Expedia 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-Nantucket 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 Nantucket

Have a flexible travel schedule? Discover the best time to fly to Nantucket from Seattle with our price prediction graph.
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 Nantucket

What is the cheapest month to book a flight from Seattle to Nantucket?

Currently, March is the cheapest month in which you can book a flight from Seattle to Nantucket (average of $108). Flying from Seattle to Nantucket in January is currently the most expensive (average of $257). 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.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Nantucket. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Nantucket?

    For as low as $814, Delta can have you in Nantucket from Seattle in 10h 34m. There are 2565 mi between Seattle and Nantucket. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Seattle to Nantucket that include hotel bookings?

    Yes. In addition to deals on Seattle to Nantucket flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Nantucket?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Nantucket.

  • Can I find deals for business class flights from Seattle to Nantucket?

    Yes. Cheapflights offers flight deals from Seattle to Nantucket 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 Seattle to Nantucket?

    Currently, March is the cheapest month in which you can book a flight from Seattle to Nantucket (average of $108). Flying from Seattle to Nantucket in January is currently the most expensive (average of $257). 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.

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