Cheap flights from Washington, D.C. Dulles Intl Airport to Ireland from $255

In general, January 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 $606. If you aren’t able to travel to Ireland during the month of January, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $616.

The cheapest day to depart on your flight to Ireland is on a Wednesday when prices can be found for as low as $840. 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 $918. 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 Washington, D.C. Dulles Intl Airport to Ireland in the afternoon for as low as $873. 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 $875.

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 $774 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 $662 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.

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

Aer Lingus, United Airlines and Icelandair 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 9 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 16% 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 191 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.

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday 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 11% of their flights experiencing any sort of delay.

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

As of August 2026, 93 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 16% of weekly flights taking off on this day.