Cheap flights from Washington, D.C. Dulles Intl Airport to Ireland from $261

In general, February is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $358. If you aren’t able to travel to Ireland during the month of February, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $361.

The cheapest day to depart on your flight to Ireland is on a Tuesday when prices can be found for as low as $750. This is often the case because there is less demand to fly during this day of the week. Flights from Washington, D.C. Dulles Intl Airport to Ireland on a Friday will generally be more expensive and average around $858. 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. Dulles Intl Airport to Ireland in the evening for as low as $797. 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 $810.

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

You are more likely to see cheaper flights to Ireland from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around $728 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. Dulles Intl Airport for as low as $638 on momondo.

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

KLM, United Airlines, and Air France are the most popular carriers operating from Washington, D.C. Dulles Intl to Ireland

Aer Lingus, United Airlines and American Airlines are the top three most popular airlines that fly to Ireland from Washington, D.C. Dulles Intl Airport according to our data. Aer Lingus is the first choice among our users, with 61% of people opting to fly with this airline when traveling to Ireland. Keep in mind that there are 11 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.

9 flights are operational daily from Washington, D.C. Dulles Intl Airport to Ireland as of May 2026. The most popular departure time for this route is 5:00PM, with 63% of flights per day taking off in the evening.

As of May 2026, 69 flights take off from Washington, D.C. Dulles Intl Airport and land in Ireland each week. The most common flight departure day for this route is Mon, with 22% of weekly flights taking off on this day.