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Shannon

$389+ Cheap flights from Seattle (SEA) to Shannon (SNN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SNN
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Seattle to Shannon

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Shannon (SNN). 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 September 17, 2025.

Round-trip from

$436
(American Airlines)

One-way from

$389
(United Airlines)

Popular in

June

Cheapest in

July

Average price

$686
From Seattle/Tacoma Intl to Shannon
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One-way flight from Seattle/Tacoma Intl to Shannon
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Highest demand for flights based on searches. 5% potential increase in price ($46 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($45 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Seattle to Shannon

Cheapest flights from Seattle to Shannon
Explore the most affordable flight options available from Seattle to Shannon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/15. 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.
Sun 11/26:50 pmSEA - SNN
1 stop13h 55mAmerican Airlines
Tue 11/187:50 amSNN - SEA
1 stop17h 05mAmerican Airlines
Deal found 9/15$436
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 10/147:00 amSEA - SNN
2 stops19h 15mUnited Airlines
Tue 10/2112:30 pmSNN - SEA
2 stops17h 04mUnited Airlines
Deal found 9/16$500
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Fri 10/241:30 pmSEA - SNN
1 stop13h 50mAmerican Airlines
Tue 10/287:50 amSNN - SEA
2 stops20h 58mAmerican Airlines
Deal found 9/16$618
This Gotogate deal was found by Cheapflights users on 9/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/28:00 pmSEA - SNN
2 stops36h 45mAir Canada
Tue 11/187:50 amSNN - SEA
2 stops19h 26mAir Canada
Deal found 9/15$639
This British Airways deal was found by Cheapflights users on 9/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/211:30 pmSEA - SNN
1 stop13h 50mBritish Airways
Fri 10/318:05 pmSNN - SEA
1 stop23h 25mBritish Airways
Deal found 9/16$687
This British Airways deal was found by Cheapflights users on 9/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/218:20 pmSEA - SNN
1 stop31h 00mBritish Airways
Mon 10/278:05 pmSNN - SEA
1 stop23h 25mBritish Airways
Deal found 9/16$695
This British Airways deal was found by Cheapflights users on 9/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/211:30 pmSEA - SNN
1 stop13h 50mBritish Airways
Tue 10/287:50 amSNN - SEA
2 stops21h 10mBritish Airways
Deal found 9/16$705
This Air Canada deal was found by Cheapflights users on 9/16. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/215:30 amSEA - SNN
2 stops31h 05mAir Canada
Wed 10/298:05 pmSNN - SEA
2 stops33h 01mAir Canada
Deal found 9/16$709

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Shannon 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 September 17, 2025.
Use the filters below to find and compare flights from Seattle to Shannon that are best for you.

Fly from

Seattle

Fly to

Shannon

Route

Depart

Return

Price

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Sun 11/2

6:50 pm-4:45 pm

1 stop13h 55m

Shannon

Tue 11/18

7:50 am-4:55 pm

1 stop17h 05m

$436

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Tue 10/14

7:00 am-10:15 am

2 stops19h 15m

Shannon

Tue 10/21

12:30 pm-9:34 pm

2 stops17h 04m

$500

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Thu 3/12

7:50 pm-4:45 pm

1 stop13h 55m

Shannon

Sun 3/15

7:50 am-5:55 pm

1 stop17h 05m

$536

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Fri 10/24

1:30 pm-11:20 am

1 stop13h 50m

Shannon

Tue 10/28

7:50 am-9:48 pm

2 stops20h 58m

$618

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Sun 11/2

8:00 pm-4:45 pm

2 stops36h 45m

Shannon

Tue 11/18

7:50 am-7:16 pm

2 stops19h 26m

$639

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Wed 10/22

1:30 pm-11:20 am

1 stop13h 50m

Shannon

Fri 10/31

8:05 pm-12:30 pm

1 stop23h 25m

$687

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Wed 10/22

1:30 pm-11:20 am

1 stop13h 50m

Shannon

Thu 10/30

5:30 pm-5:55 pm

1 stop31h 25m

$695

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Tue 10/14

7:05 am-10:15 am

2 stops19h 10m

$389

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Sun 11/9

6:15 pm-7:25 pm

3 stops41h 10m

$1,515

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Sun 11/9

6:50 pm-7:25 pm

1 stop16h 35m

$2,740

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Best time to book a flight from Seattle to Shannon

Have a flexible travel schedule? Discover the best time to fly to Shannon 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 Shannon

What is the cheapest month to book a flight from Seattle to Shannon, Clare?

Currently, February is the cheapest month in which you can book a flight from Seattle to Shannon, Clare (average of $533). Flying from Seattle to Shannon, Clare in June is currently the most expensive (average of $928). 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.

What is the cheapest time of day to fly from SEA to SNN?

Find hourly flight availability from Seattle to Shannon. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 12% on flights from Seattle to Shannon, Clare by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Seattle to Shannon, Clare?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Shannon. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Shannon, Clare flight should consider departing on Tuesday at noon when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Shannon

Get insights into the airlines that provide service to Shannon. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Shannon. Reviews last updated September 17, 2025.
Read through reviews of airlines operating flights from Seattle to Shannon, such as United Airlines, American Airlines, and Aer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,926 reviews

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
United Airlines
7.4
Good
8,926 reviews
United Airlines
7.4
Good
8,926 reviews

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,926 reviews

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
Aer Lingus
7.2
Good
1,277 reviews
United Airlines
7.4
Good
8,926 reviews

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Shannon. 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 Shannon, Clare?

    American Airlines and United Airlines can get you from Seattle to Shannon, Clare in just under 13h 55m. Your travel time can differ by up to 5h 20m. Seattle and Shannon, Clare are separated by a distance of 4485 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Seattle to Shannon, Clare round-trip?

    Currently priced at $541, American Airlines will fly you from Seattle to Shannon, Clare and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Aer Lingus - these airlines can fly you to your destination from $593 and $715, respectively. American Airlines is currently priced 33% below the average price you’ll pay for this route.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Shannon 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 Shannon, Clare?

    Currently, February is the cheapest month in which you can book a flight from Seattle to Shannon, Clare (average of $533). Flying from Seattle to Shannon, Clare in June is currently the most expensive (average of $928). 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.

See more FAQs

Traveling to a place near Shannon?

Book flights to Shannon if you plan to visit one of these locations
Ennis

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Top 3 airlines flying from Seattle to Shannon

Discover the top 3 airlines that operate flights from Seattle to Shannon. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$541Average$623FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$593Average$768FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$715Average$797FlexibilityNo cancel feeOn-timeN/A

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