Cheap flights from Ireland to Washington, D.C. from €243

The cheapest month to fly to Washington, D.C. from Ireland is in September. Flight prices, which tend to average around €429, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Washington, D.C. from Ireland during March instead. Flights to Washington, D.C. in March, while not as cheap as those in September, still average around €438.

The cheapest day to depart from Ireland to Washington, D.C. is on a Thursday. Travellers who choose to depart for Washington, D.C. on a Thursday will often find tickets for as low as €648. 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. on Sunday is €791.

Flying to Washington, D.C. from Ireland in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as €514 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are €697 on average. Flights to Washington, D.C. from Ireland in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 €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. from Ireland for as low as €422 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.

Icelandair and British Airways are the most popular carriers operating from Ireland to Washington, D.C.

Aer Lingus, United Airlines and PLAY 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 67% of people opting to fly with this airline when travelling to Washington, D.C.. Keep in mind that there are 3 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 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.

As of February 2026, 4 flights take off from Ireland and land in Washington, D.C. each day. The most common flight departure time for this route is 12:00, with 100% of daily flights taking off in the afternoon.

As of February 2026, there are 28 flights per week flying from Ireland to Washington, D.C.. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.