$377 Cheap Flights from Seattle (SEA) to Knock (NOC)

View $377 flight on Fri, Jul 11, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Knock (NOC-Ireland West)

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Cheap Flights from Seattle to Knock (SEA-NOC)

Prices were available within the past 7 days and start at $377 for one-way flights and $775 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Wed, Aug 13 - Wed, Aug 20
SEA
Seattle
NOC
Knock
$775 Roundtrip, found 4 hours ago
$775
Roundtrip
found 4 hours ago
Select British Airways flight, departing Wed, Aug 13 from Seattle to Knock, returning Wed, Aug 20, priced at $775 found 4 hours ago
American Airlines
Fri, Aug 8 - Fri, Aug 15
SEA
Seattle
NOC
Knock
$798 Roundtrip, found 5 days ago
$798
Roundtrip
found 5 days ago
Select American Airlines flight, departing Fri, Aug 8 from Seattle to Knock, returning Fri, Aug 15, priced at $798 found 5 days ago
Air Canada
Wed, Aug 13 - Wed, Aug 20
SEA
Seattle
NOC
Knock
$800 Roundtrip, found 4 hours ago
$800
Roundtrip
found 4 hours ago
Select Air Canada flight, departing Wed, Aug 13 from Seattle to Knock, returning Wed, Aug 20, priced at $800 found 4 hours ago
British Airways
Sun, Aug 10 - Sun, Aug 17
SEA
Seattle
NOC
Knock
$814 Roundtrip, found 3 days ago
$814
Roundtrip
found 3 days ago
Select British Airways flight, departing Sun, Aug 10 from Seattle to Knock, returning Sun, Aug 17, priced at $814 found 3 days ago
Air Canada
Wed, Aug 13 - Wed, Aug 20
SEA
Seattle
NOC
Knock
$816 Roundtrip, found 4 hours ago
$816
Roundtrip
found 4 hours ago
Select Air Canada flight, departing Wed, Aug 13 from Seattle to Knock, returning Wed, Aug 20, priced at $816 found 4 hours ago
American Airlines
Fri, Aug 8 - Fri, Aug 15
SEA
Seattle
NOC
Knock
$842 Roundtrip, found 5 days ago
$842
Roundtrip
found 5 days ago
Select American Airlines flight, departing Fri, Aug 8 from Seattle to Knock, returning Fri, Aug 15, priced at $842 found 5 days ago
Air Canada
Fri, Aug 8 - Fri, Aug 15
SEA
Seattle
NOC
Knock
$846 Roundtrip, found 5 days ago
$846
Roundtrip
found 5 days ago
Select Air Canada flight, departing Fri, Aug 8 from Seattle to Knock, returning Fri, Aug 15, priced at $846 found 5 days ago
British Airways
Sun, Aug 10 - Sun, Aug 17
SEA
Seattle
NOC
Knock
$889 Roundtrip, found 3 days ago
$889
Roundtrip
found 3 days ago
Select British Airways flight, departing Sun, Aug 10 from Seattle to Knock, returning Sun, Aug 17, priced at $889 found 3 days ago
Finnair
Wed, Aug 13 - Wed, Aug 20
SEA
Seattle
NOC
Knock
$1,165 Roundtrip, found 4 hours ago
$1,165
Roundtrip
found 4 hours ago
Select Finnair flight, departing Wed, Aug 13 from Seattle to Knock, returning Wed, Aug 20, priced at $1,165 found 4 hours ago
Aer Lingus
Wed, Aug 13 - Wed, Aug 20
SEA
Seattle
NOC
Knock
$1,914 Roundtrip, found 4 hours ago
$1,914
Roundtrip
found 4 hours ago
Select Aer Lingus flight, departing Wed, Aug 13 from Seattle to Knock, returning Wed, Aug 20, priced at $1,914 found 4 hours ago
Flights from Seattle (SEA) to Knock (NOC)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Ireland West
Roundtrip price
$774
Distance
4429 mi

Seattle to Knock Flights

The cheapest times to fly from Seattle to Knock

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Knock are during the month of August. You can find some of the cheapest flights from Seattle to Knock with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Knock

Sunday is one of the best days to book for cheap flights from Seattle to Knock: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Knock

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Knock in 2025. You can also book with separate airlines for your outbound and return journeys, from $377 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Knock flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Knock airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC) cost?
Discover the latest flight deals from SEA to NOC by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from SEA to NOC?
The cheapest flights from SEA to NOC are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from SEA to NOC?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from SEA to NOC. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC)?
You'll need to catch a flight with a layover when traveling from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from SEA to NOC?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* However, this can vary depending on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC)?
To arrive at Ireland West Airport (NOC) on schedule, book a flight that takes off from Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC) last-minute?
Waiting until just before your departure to book your flight from SEA to NOC often results in higher prices. While it's possible to find some last-minute discounts, they're not always guaranteed. Be flexible with your travel plans for a better chance of getting a bargain.
Is it cheaper to book a SEA to NOC flight and hotel package?
You can save money by booking a SEA to NOC flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your preferred accommodations and flights, consider adding extras like car rentals, activities and tours.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC)?
In most cases, you can reschedule or cancel your SEA to NOC flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you need further information, visit our Customer Service portal.

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*Available to One Key members.