Cheap flights from Washington, D.C. to Ireland from $303

In general, November is the cheapest month to fly from Washington, D.C. to Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $123. If you aren’t able to travel to Ireland during the month of November, then flying in December is also cheap. Prices for this month can be found on momondo for an average of $232.

The cheapest day to depart on your flight to Ireland is on a Tuesday when prices can be found for as low as $727. This is often the case because there is less demand to fly during this day of the week. Flights from Washington, D.C. to Ireland on a Friday will generally be more expensive and average around $841. 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 evening. momondo users have found flights departing from Washington, D.C. to Ireland in the evening for as low as $779. 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 afternoon when prices are around $793.

Fly from Washington, D.C. Dulles Intl to Dublin for the best Washington, D.C. - Ireland flight prices

You are more likely to see cheaper flights to Ireland from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around $727 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from Washington, D.C. for as low as $638 on momondo.

JetBlue, Aer Lingus, and Icelandair are the most popular carriers operating from Washington, D.C. to Ireland

Aer Lingus, United Airlines and Icelandair are the top three most popular airlines that fly to Ireland from Washington, D.C. according to our data. Aer Lingus is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Ireland. Keep in mind that there are 14 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 17% of flights between Washington, D.C. and Ireland have experienced a delay on any given week. The average delay length over the past 12 months has been 182 minutes.

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

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday 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 13% of their flights experiencing any sort of delay.

14 flights are operational daily from Washington, D.C. to Ireland as of May 2026. The most popular departure time for this route is 5:00PM, with 65% of flights per day taking off in the evening.

The number of flights available between Washington, D.C. and Ireland is 101 per week as of May 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.