Cheap flights from the United States to Ireland from $125

In general, February is the cheapest month to fly from United States to Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $505. If you aren’t able to travel to Ireland during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $533.

The cheapest day to depart on your flight to Ireland is on a Wednesday when prices can be found for as low as $804. This is often the case because there is less demand to fly during this day of the week. Flights from United States to Ireland on a Friday will generally be more expensive and average around $909. 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 United States to Ireland in the afternoon for as low as $812. 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 $856.

Fly from Boston Logan Intl to Dublin for the best United States - Ireland flight prices

You are more likely to see cheaper flights to Ireland from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around $556 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from United States for as low as $498 on momondo.

There are 4 cabin classes available to choose from on United States to Ireland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Aer Lingus, Delta, and KLM are the most popular carriers operating from United States to Ireland

Aer Lingus, United Airlines and American Airlines are the top three most popular airlines that fly to Ireland from United States according to our data. Aer Lingus is the first choice among our users, with 59% of people opting to fly with this airline when traveling to Ireland. Keep in mind that there are 21 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 15% of flights between United States and Ireland have experienced a delay on any given week. The average delay length over the past 12 months has been 168 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. Thursday 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 12% of their flights experiencing any sort of delay.

As of July 2026, there are 106 flights per day flying from United States to Ireland. The most common time of day flights depart is 5:00PM, with 65% of flights taking off in the evening.

745 flights are operational weekly from United States to Ireland as of July 2026. The most popular departure day for this route is Thu, with 14% of flights per week taking off on this day.