Cheap flights from Ireland to Seattle from $379

In general, September is the cheapest month to fly from Ireland to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $429. If you don’t want to visit Seattle in September, then you should wait until August to fly from Ireland, when ticket prices are also cheap, with an average price of $430.

On average, the least expensive day to fly to Seattle from Ireland is on a Saturday. momondo users have found tickets for Saturday departures for as low as $614. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Ireland because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,226.

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

You are more likely to see cheaper flights to Seattle from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $723 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Ireland for as low as $555 on momondo.

There are 3 cabin classes available to choose from on Ireland to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 28% on your flight if you consider stops on a Ireland to Seattle flight.

Historically, on average around 10% of flights between Ireland and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 168 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Saturday has historically seen more delays on average compared to the rest of the week.

According to our data, Aer Lingus have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

The number of flights available between Ireland and Seattle is 4 per day as of June 2026. The most frequent departure time is 3:00PM, with 100% of daily flights leaving in the afternoon.

As of June 2026, there are 28 flights per week flying from Ireland to Seattle. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.