$108 Cheap United flights Washington (IAD) to Nantucket (ACK)

View $108 flight on Mon, Sep 1, 2025Opens in a new window

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$108 Cheap United flights Washington (IAD) to Nantucket (ACK)

Prices were available within the past 7 days and start at $108 for one-way flights and $238 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Aug 25 - Thu, Aug 28
IAD
Washington
ACK
Nantucket
$238 Roundtrip, found 9 hours ago
$238
Roundtrip
found 9 hours ago
Select United flight, departing Mon, Aug 25 from Washington to Nantucket, returning Thu, Aug 28, priced at $238 found 9 hours ago
United
Mon, Aug 25 - Thu, Aug 28
IAD
Washington
ACK
Nantucket
$283 Roundtrip, found 9 hours ago
$283
Roundtrip
found 9 hours ago
Select United flight, departing Mon, Aug 25 from Washington to Nantucket, returning Thu, Aug 28, priced at $283 found 9 hours ago
United
Mon, Aug 25 - Thu, Aug 28
IAD
Washington
ACK
Nantucket
$298 Roundtrip, found 9 hours ago
$298
Roundtrip
found 9 hours ago
Select United flight, departing Mon, Aug 25 from Washington to Nantucket, returning Thu, Aug 28, priced at $298 found 9 hours ago
United
Sun, Aug 10 - Wed, Aug 13
IAD
Washington
ACK
Nantucket
$306 Roundtrip, found 1 day ago
$306
Roundtrip
found 1 day ago
Select United flight, departing Sun, Aug 10 from Washington to Nantucket, returning Wed, Aug 13, priced at $306 found 1 day ago
United
Wed, Aug 27 - Thu, Sep 4
IAD
Washington
ACK
Nantucket
$314 Roundtrip, found 1 day ago
$314
Roundtrip
found 1 day ago
Select United flight, departing Wed, Aug 27 from Washington to Nantucket, returning Thu, Sep 4, priced at $314 found 1 day ago
United
Mon, Sep 22 - Wed, Sep 24
IAD
Washington
ACK
Nantucket
$316 Roundtrip, found 9 hours ago
$316
Roundtrip
found 9 hours ago
Select United flight, departing Mon, Sep 22 from Washington to Nantucket, returning Wed, Sep 24, priced at $316 found 9 hours ago
Flights from Washington (IAD) to Nantucket (ACK)
Origin airport
Washington Dulles Intl.
Destination airport
Nantucket Memorial
Airlines serving
American Airlines, Delta, United
Popular airline
United
Distance
421 mi

Frequently asked questions

How much is a United Airlines flight from Washington Dulles Intl. Airport (IAD) to Nantucket Memorial Airport (ACK)?
You'll discover cheap round-trip United Airlines flights from $238 from IAD to ACK by organizing your results from "Price (lowest to highest)" on Expedia. Or search for options from $108 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from IAD to ACK with United Airlines?
United Airlines flights to Nantucket are often more affordable in the quieter months of February and January. Whether you're after a one-way or a return ticket, you could score a better deal then.
What is the cheapest time to book flights from Washington Dulles Intl. Airport (IAD) to Nantucket Memorial Airport (ACK) with United Airlines?
Search for affordable United Airlines flights from Washington Dulles Intl. Airport (IAD) to Nantucket Memorial Airport (ACK) one to three months before your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare class and itinerary, the best day to book a domestic flight is usually Sunday and the most expensive day is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Washington Dulles Intl. Airport (IAD) to Nantucket Memorial Airport (ACK)?
Click on our "Nonstop" filter when looking for direct United Airlines flights from IAD to ACK. It's also a great way to compare other carriers servicing the same direct trip.
What is the earliest United Airlines flight from IAD to ACK?
Find United Airlines's earliest flights from IAD to ACK by selecting our "Early Morning" and "Morning" filters. Not only will you get to your destination sooner, early departures also experience 20% fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Nantucket?
Nantucket Memorial Airport (ACK) is the main Nantucket gateway for United Airlines flights from Washington Dulles Intl. Airport (IAD).
Why fly with United Airlines from IAD to ACK?
With a rewarding loyalty program, United Airlines is a top pick for many passengers departing from IAD to ACK. Plus, if you're a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from Washington Dulles Intl. Airport (IAD) to Nantucket Memorial Airport (ACK)?
It's generally possible to cancel or modify your flight, although additional fees may apply if your booking was made more than 24 hours ago. Need flexible options? Make use of Expedia's "No cancel fee" and "Changes included" filters to find flights that won't charge you extra if you have to alter your plans. To modify your booking, visit "Trips," select your flight and click on "Manage Booking" for more details.

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