Cheap flights from Ireland to Washington, D.C. from £275

The cheapest month to fly to Washington, D.C. from Ireland is in September. Flight prices, which tend to average around £135, are often lower during this time because this is during the off-season. If you don’t want to visit Washington, D.C. in September, then you should wait until November to fly from Ireland, when ticket prices are also cheap, with an average price of £269.

On average, the least expensive day to fly to Washington, D.C. from Ireland is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £583. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Wednesday 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 £667.

In the afternoon is the cheapest time of day to fly from Ireland to Washington, D.C. when you can find flight prices for as low as £510. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Flights to Washington, D.C. are more costly in the morning, with an average ticket price of £632. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Washington, D.C. from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around £481 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. from Ireland for as low as £374 on momondo.

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

JetBlue, WestJet, and TAP AIR PORTUGAL are the most popular carriers operating from Ireland to Washington, D.C.

Aer Lingus, British Airways and United Airlines are the top three most popular airlines that fly to Washington, D.C. from Ireland according to our data. Aer Lingus is the first choice among our users, with 56% of people opting to fly with this airline when travelling to Washington, D.C.. Keep in mind that there are 5 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

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 155 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. is 13 per day as of May 2026. The most frequent departure time is 12:00, with 83% of daily flights leaving in the afternoon.

91 flights are operational weekly from Ireland to Washington, D.C. as of May 2026. The most popular departure day for this route is Thu, with 16% of flights per week taking off on this day.