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Shannon

$315+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SNN
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
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 August 20, 2025.

Round-trip from

$528
(United Airlines)

One-way from

$315
(Kiwi.com)

Popular in

June

Cheapest in

July

Average price

$790
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. 9% potential increase in price ($85 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($47 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 20, 2025.

This American Airlines deal was found by Cheapflights users on 8/18. 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.
Tue 9/301:30 pmSEA - SNN
1 stop18h 40mAmerican Airlines
Tue 10/79:15 pmSNN - SEA
1 stop22h 20mAmerican Airlines
Deal found 8/18$585
This United Airlines deal was found by Cheapflights users on 8/19. 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 9/1610:55 amSEA - SNN
1 stop12h 35mUnited Airlines
Tue 9/239:30 amSNN - SEA
1 stop20h 50mUnited Airlines
Deal found 8/19$587
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Mon 9/151:02 pmSEA - SNN
2 stops19h 08mAmerican Airlines
Mon 9/229:15 pmSNN - SEA
1 stop21h 55mAmerican Airlines
Deal found 8/18$589
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Mon 9/1510:55 amSEA - SNN
1 stop12h 35mUnited Airlines
Mon 9/229:30 amSNN - SEA
1 stop17h 19mUnited Airlines
Deal found 8/18$647
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Thu 10/27:05 amSEA - SNN
3 stops19h 10mUnited Airlines
Thu 10/912:30 pmSNN - SEA
2 stops18h 59mUnited Airlines
Deal found 8/18$688
This United Airlines deal was found by Cheapflights users on 8/19. 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.
Fri 10/36:35 amSEA - SNN
2 stops19h 40mUnited Airlines
Fri 10/1012:30 pmSNN - SEA
2 stops29h 29mUnited Airlines
Deal found 8/19$689
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Sat 10/48:42 amSEA - SNN
2 stops17h 33mUnited Airlines
Sat 10/1112:30 pmSNN - SEA
2 stops18h 45mUnited Airlines
Deal found 8/20$712
This American Airlines deal was found by Cheapflights users on 8/20. 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.
Sat 9/133:00 pmSEA - SNN
2 stops17h 05mAmerican Airlines
Sun 10/59:15 pmSNN - SEA
1 stop22h 20mAmerican Airlines
Deal found 8/20$756

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 August 20, 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

Tue 9/30

1:30 pm-4:10 pm

1 stop18h 40m

Shannon

Tue 10/7

9:15 pm-11:35 am

1 stop22h 20m

$585

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Tue 9/16

10:55 am-7:30 am

1 stop12h 35m

Shannon

Tue 9/23

9:30 am-10:20 pm

1 stop20h 50m

$587

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Mon 9/15

1:02 pm-4:10 pm

2 stops19h 08m

Shannon

Mon 9/22

9:15 pm-11:10 am

1 stop21h 55m

$589

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Mon 9/15

10:55 am-7:30 am

1 stop12h 35m

Shannon

Mon 9/22

9:30 am-6:49 pm

1 stop17h 19m

$647

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Thu 10/2

7:00 am-10:15 am

2 stops19h 15m

Shannon

Thu 10/9

12:30 pm-11:29 pm

2 stops18h 59m

$651

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Mon 9/15

9:33 pm-8:20 pm

2 stops38h 47m

$315

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Mon 9/15

11:59 pm-5:55 am

1 stop21h 56m

$341

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Mon 12/15

2:43 pm-9:30 pm

2 stops46h 47m

$441

SeattleShannon

SEA - SNN

SEASNN

Seattle/Tacoma Intl

Sun 12/14

1:23 am-6:20 am

2 stops20h 57m

$660

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

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 $931). 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 August 20, 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 August 20, 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
8,928 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,928 reviews
United Airlines
7.4
Good
8,928 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,928 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Aer Lingus
7.1
Good
1,228 reviews
United Airlines
7.4
Good
8,928 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.7
Okay
7,289 reviews
United Airlines
7.4
Good
8,928 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 12h 35m. Your travel time can differ by up to 6h 05m. 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 $583, 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 British Airways - these airlines can fly you to your destination from $593 and $703, respectively. American Airlines is currently priced 30% 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 $931). 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 4 airlines flying from Seattle to Shannon

Discover the top 4 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 August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$583Average$721FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$593Average$786FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$703Average$881FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$703Average$797FlexibilityNo cancel feeOn-timeN/A

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