Cheap flights from Ireland to Washington, D.C. from €309

The month of November is, on average, the cheapest month to fly to Washington, D.C. Dulles Intl Airport from Ireland, with most prices found around €431. If you aren’t able to travel during the month of November, then book flights to Washington, D.C. Dulles Intl Airport from Ireland during September instead. Flights to Washington, D.C. Dulles Intl Airport in September, while not as cheap as those in November, still average around €441.

According to our data, Thursday is the cheapest day to fly to Washington, D.C. Dulles Intl Airport from Ireland. The lowest ticket price found for a Thursday departure recently was €648. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Washington, D.C. Dulles Intl Airport on Sunday is €792.

According to our data, the cheapest time of day to fly to Washington, D.C. Dulles Intl Airport is in the afternoon. momondo users have found flights departing from Ireland to Washington, D.C. Dulles Intl Airport in the afternoon for as low as €514. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Try not to purchase tickets in the morning because they tend to be around €697. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around €519 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Ireland for as low as €422 on momondo.

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

Historically, on average around 14% of flights between Ireland and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 150 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights departing in the morning have, in the past, seen delays more frequently in comparison.

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

According to our data, Aer Lingus have had the fewest delays on this route over the last 12 months, with about 13% of their flights experiencing any sort of delay.

The number of flights available between Ireland and Washington, D.C. Dulles Intl Airport is 4 per day as of February 2026. The most frequent departure time is 12:00, with 100% of daily flights leaving in the afternoon.

28 flights are operational weekly from Ireland to Washington, D.C. Dulles Intl Airport as of February 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.