$501 Cheap Flights from Seattle (SEA) to Knock (NOC)

View $501 flight on Tue, Oct 21, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Seattle to Knock (SEA-NOC)

Prices were available within the past 7 days and start at $501 for one-way flights and $749 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Oct 21 - Tue, Oct 28
SEA
Seattle
NOC
Knock
$749 Roundtrip, found 4 hours ago
$749
Roundtrip
found 4 hours ago
Select Air Canada flight, departing Tue, Oct 21 from Seattle to Knock, returning Tue, Oct 28, priced at $749 found 4 hours ago
Air Canada
Tue, Oct 21 - Tue, Oct 28
SEA
Seattle
NOC
Knock
$756 Roundtrip, found 4 hours ago
$756
Roundtrip
found 4 hours ago
Select Air Canada flight, departing Tue, Oct 21 from Seattle to Knock, returning Tue, Oct 28, priced at $756 found 4 hours ago
American Airlines
Sun, Oct 19 - Fri, Oct 31
SEA
Seattle
NOC
Knock
$759 Roundtrip, found 4 hours ago
$759
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Sun, Oct 19 from Seattle to Knock, returning Fri, Oct 31, priced at $759 found 4 hours ago
American Airlines
Sun, Oct 19 - Mon, Oct 27
SEA
Seattle
NOC
Knock
$779 Roundtrip, found 4 hours ago
$779
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Sun, Oct 19 from Seattle to Knock, returning Mon, Oct 27, priced at $779 found 4 hours ago
Air Canada
Wed, Oct 1 - Wed, Oct 8
SEA
Seattle
NOC
Knock
$795 Roundtrip, found 7 hours ago
$795
Roundtrip
found 7 hours ago
Select Air Canada flight, departing Wed, Oct 1 from Seattle to Knock, returning Wed, Oct 8, priced at $795 found 7 hours ago
Air Canada
Wed, Oct 1 - Wed, Oct 8
SEA
Seattle
NOC
Knock
$801 Roundtrip, found 7 hours ago
$801
Roundtrip
found 7 hours ago
Select Air Canada flight, departing Wed, Oct 1 from Seattle to Knock, returning Wed, Oct 8, priced at $801 found 7 hours ago
American Airlines
Sat, Oct 18 - Fri, Oct 31
SEA
Seattle
NOC
Knock
$809 Roundtrip, found 4 hours ago
$809
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Sat, Oct 18 from Seattle to Knock, returning Fri, Oct 31, priced at $809 found 4 hours ago
Aer Lingus
Wed, Oct 22 - Mon, Oct 27
SEA
Seattle
NOC
Knock
$824 Roundtrip, found 4 hours ago
$824
Roundtrip
found 4 hours ago
Select Aer Lingus flight, departing Wed, Oct 22 from Seattle to Knock, returning Mon, Oct 27, priced at $824 found 4 hours ago
Iberia
Tue, Sep 30 - Tue, Oct 7
SEA
Seattle
NOC
Knock
$838 Roundtrip, found 1 day ago
$838
Roundtrip
found 1 day ago
Select Iberia flight, departing Tue, Sep 30 from Seattle to Knock, returning Tue, Oct 7, priced at $838 found 1 day ago
British Airways
Wed, Oct 1 - Wed, Oct 8
SEA
Seattle
NOC
Knock
$841 Roundtrip, found 7 hours ago
$841
Roundtrip
found 7 hours ago
Select British Airways flight, departing Wed, Oct 1 from Seattle to Knock, returning Wed, Oct 8, priced at $841 found 7 hours ago

Alternative airports near Knock

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ireland West NOC. Cheapest and Closest option available. Average driving time to city center is 14 minutes. Flights from $1,101
NOC
Ireland West
CheapestClosest
Average driving time to city center14 min
Flights from $1,101
Flights from Seattle (SEA) to Knock (NOC)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Ireland West
Airlines serving
Aer Lingus, British Airways
Roundtrip price
$749
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 October. 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 $501 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?
Snag a cheap one-way flight from $501 or cheap return flight from $749 from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC)?
October is the cheapest month to fly from SEA to NOC. Timing your trip outside of the busy season is often the key to scoring lower fares.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Ireland West Airport (NOC)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SEA to NOC flight.
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.

Explore a world of travel with Expedia

*Available to One Key members.