Cheap flights from Seattle to Ireland from $248

In general, February is the cheapest month to fly from Seattle to Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $474. If you aren’t able to travel to Ireland during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $517.

The cheapest day to depart on your flight to Ireland is on a Wednesday when prices can be found for as low as $765. This is often the case because there is less demand to fly during this day of the week. Flights from Seattle to Ireland on a Saturday will generally be more expensive and average around $1,095. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

According to our data, the cheapest time of day to fly to Ireland is in the afternoon. momondo users have found flights departing from Seattle to Ireland in the afternoon for as low as $751. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Ireland is in the evening when prices are around $951.

Fly from Seattle/Tacoma Intl to Dublin for the best Seattle/Tacoma Intl - Ireland flight prices

You are more likely to see cheaper flights to Ireland from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around $760 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from Seattle for as low as $621 on momondo.

There are 2 cabin classes available to choose from on Seattle to Ireland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

JetBlue, Aer Lingus, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Ireland

Aer Lingus, Icelandair and American Airlines are the top three most popular airlines that fly to Ireland from Seattle according to our data. Aer Lingus is the first choice among our users, with 67% of people opting to fly with this airline when traveling to Ireland. Keep in mind that there are 13 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

3 flights are operational daily from Seattle to Ireland as of September 2026. The most popular departure time for this route is 7:00PM, with 100% of flights per day taking off in the evening.

24 flights are operational weekly from Seattle to Ireland as of September 2026. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.