$389 Cheap Flights from Seattle (SEA) to Shannon (SNN)

View $389 flight on Wed, Jul 22, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Shannon Airport (SNN)

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Cheap Flights from Seattle to Shannon (SEA-SNN)

Prices were available within the past 7 days and start at $389 for one-way flights and $481 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Apr 8 - Wed, Apr 15
SEA
Seattle
SNN
Shannon
$481 Roundtrip, found 17 hours ago
$481
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Apr 8 from Seattle to Shannon, returning Wed, Apr 15, priced at $481 found 17 hours ago
United
Wed, Apr 8 - Tue, Apr 14
SEA
Seattle
SNN
Shannon
$485 Roundtrip, found 17 hours ago
$485
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Apr 8 from Seattle to Shannon, returning Tue, Apr 14, priced at $485 found 17 hours ago
United
Wed, Apr 8 - Thu, Apr 16
SEA
Seattle
SNN
Shannon
$487 Roundtrip, found 17 hours ago
$487
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Apr 8 from Seattle to Shannon, returning Thu, Apr 16, priced at $487 found 17 hours ago
United
Mon, Apr 13 - Wed, Apr 22
SEA
Seattle
SNN
Shannon
$487 Roundtrip, found 3 days ago
$487
Roundtrip
found 3 days ago
Select United flight, departing Mon, Apr 13 from Seattle to Shannon, returning Wed, Apr 22, priced at $487 found 3 days ago
United
Sat, Apr 4 - Tue, Apr 14
SEA
Seattle
SNN
Shannon
$490 Roundtrip, found 17 hours ago
$490
Roundtrip
found 17 hours ago
Select United flight, departing Sat, Apr 4 from Seattle to Shannon, returning Tue, Apr 14, priced at $490 found 17 hours ago
United
Wed, Apr 15 - Tue, Apr 21
SEA
Seattle
SNN
Shannon
$491 Roundtrip, found 1 day ago
$491
Roundtrip
found 1 day ago
Select United flight, departing Wed, Apr 15 from Seattle to Shannon, returning Tue, Apr 21, priced at $491 found 1 day ago
Air Canada
Wed, Sep 2 - Wed, Sep 9
SEA
Seattle
SNN
Shannon
$525 Roundtrip, found 5 days ago
$525
Roundtrip
found 5 days ago
Select Air Canada flight, departing Wed, Sep 2 from Seattle to Shannon, returning Wed, Sep 9, priced at $525 found 5 days ago
Lufthansa
Wed, May 13 - Thu, May 21
SEA
Seattle
SNN
Shannon
$548 Roundtrip, found 4 days ago
$548
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Wed, May 13 from Seattle to Shannon, returning Thu, May 21, priced at $548 found 4 days ago
Delta
Wed, Jul 22 - Wed, Aug 5
SEA
Seattle
SNN
Shannon
$587 Roundtrip, found 15 hours ago
$587
Roundtrip
found 15 hours ago
Select Delta flight, departing Wed, Jul 22 from Seattle to Shannon, returning Wed, Aug 5, priced at $587 found 15 hours ago
American Airlines
Wed, Apr 15 - Tue, Apr 21
SEA
Seattle
SNN
Shannon
$668 Roundtrip, found 1 day ago
$668
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Apr 15 from Seattle to Shannon, returning Tue, Apr 21, priced at $668 found 1 day ago

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Find the cheapest month to fly from Seattle (SEA) to Shannon (SNN)

August is typically the cheapest month to fly

From $522 - $1,235 per traveler.

Alternative airports near Shannon

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

Select flight to Shannon Airport SNN. Cheapest and Closest option available. Average driving time to city center is 7 minutes. Flights from $1,076
SNN
Shannon Airport
CheapestClosest
Average driving time to city center7 min
Flights from $1,076
Flights from Seattle (SEA) to Shannon (SNN)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Shannon
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, British Airways, Delta, JetBlue Airways, KLM, Lufthansa, United
Roundtrip price
$480
Distance
4488 mi

Seattle to Shannon Flights

The cheapest times to fly from Seattle to Shannon

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 Shannon are during the month of April. You can find some of the cheapest flights from Seattle to Shannon with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Shannon

Sunday is one of the best days to book for cheap flights from Seattle to Shannon: 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 Shannon

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 Shannon in 2025. You can also book with separate airlines for your outbound and return journeys, from $389 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 Shannon 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 Shannon 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 Shannon Airport (SNN) cost?
Secure a cheap one-way flight from $389 or cheap return flight from $481 from Seattle - Tacoma Intl. Airport (SEA) to Shannon Airport (SNN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Shannon Airport (SNN)?
Planning your trip for April can help you save, as it's the cheapest month for flights between SEA and SNN. You'll usually find the lowest fares during the off-season.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Shannon Airport (SNN)?
To find the cheapest airline flying from SEA to SNN, use Expedia's filter tool. Tailor your search based on what's important to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Shannon Airport (SNN)?
There aren't any daily nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to Shannon Airport (SNN). But you can opt for flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from SEA to SNN?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* However, this can vary depending on the airline, time of year 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 Shannon Airport (SNN)?
To touch down at Shannon Airport (SNN) on time, book a flight that leaves 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 Shannon Airport (SNN) last-minute?
Holding off until right before your break to book a flight from SEA to SNN generally means paying more. While you may come across some last-minute deals, they aren't always guaranteed. Allow some flexibility in your schedule to boost your chances of snagging a bargain.
Is it cheaper to book a SEA to SNN flight and hotel package?
Opting for a SEA to SNN flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Select from our impressive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Shannon Airport (SNN)?
It's usually possible to reschedule or cancel your SEA to SNN flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.