Cheap flights from Ireland to Washington, D.C. from £299

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 £376. 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 £384.

According to our data, Tuesday is the cheapest day to fly to Washington, D.C. Dulles Intl Airport from Ireland. The lowest ticket price found for a Tuesday departure recently was £554. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. On the other hand, Sunday is the most expensive day to depart from Ireland because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £619.

The cheapest time of day to fly to Washington, D.C. Dulles Intl Airport is in the afternoon when flights can be purchased for as low as £468. In contrast, the most expensive time of day to depart to Washington, D.C. Dulles Intl Airport is in the morning when prices are around £593.

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 £452 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 £368 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.

4 flights are operational daily from Ireland to Washington, D.C. Dulles Intl Airport as of February 2026. The most popular departure time for this route is 12:00, with 100% of flights per day taking off in the afternoon.

The number of flights available between Ireland and Washington, D.C. Dulles Intl Airport is 28 per week as of February 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.