$483 Cheap Aer Lingus flights Seattle (SEA) to Shannon (SNN)

Use the “Price (lowest to highest)” filter on Expedia to look for cheap Aer Lingus round-trip flights from $765 from SEA to SNN. Affordable one-way fares from $483 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Browse for return or one-way flights to Shannon in January or February. You could find cheaper fares with Aer Lingus during these off-peak months.

Getting the best Aer Lingus deals from SEA to SNN often comes down to timing. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. Better yet, you can pocket 17% on average by buying your tickets on a Sunday rather than a Friday, which is often the most expensive day to book.* It’s a good idea to start checking out flights about one month before you plan to travel.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Select our “Nonstop” filter when browsing for direct Aer Lingus flights from SEA to SNN. You can also compare other carriers offering the same direct route.

Find Aer Lingus’s earliest flights from SEA to SNN by checking our “Early Morning” and “Morning” filters. Not only will you get to your destination sooner, early departures are also 20% less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Catch an Aer Lingus flight from Seattle - Tacoma Intl. Airport (SEA) to Shannon, and you’ll most likely touch down at Shannon Airport (SNN). This is the airline’s primary hub here.

Aer Lingus allows you to bring 1 checked-in bag weighing up to 50 lb with dimensions not exceeding 62 inches on standard economy flights from SEA to SNN. You can also take 1 cabin bag in the cabin. This carry-on luggage must not exceed 21 inches x 15 inches x 9 inches and be no heavier than 22 lb. Baggage allowances can differ based on your fare type and cabin class, so double-check your booking or Aer Lingus’s website to avoid paying additional costs at the airport.

Taking off from SEA to SNN with Aer Lingus means enjoying a range of perks, including a rewarding loyalty program and a 4-star airline rating. Plus, when you book through Expedia, One Key™ members can earn OneKeyCash™* to use on select future travel purchases. That’s on top of the Aer Lingus AerClub points you can earn with Aer Lingus.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

It’s generally possible to reschedule or cancel your flight, although additional charges may apply if you made your booking over 24 hours ago. Need flexible options? Make use of Expedia’s “Changes included” or “No cancel fee” filter to find flights that won’t charge extra if you have to adjust your plans. To make changes, go to “Trips,” select your flight and click on “Manage Booking” for more details.