Cheap flights from Chicago O'Hare Intl Airport to Ireland from $275

In general, February is the cheapest month to fly from Chicago O'Hare Intl Airport 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 $524.

The cheapest day to depart on your flight to Ireland is on a Monday when prices can be found for as low as $782. This is often the case because there is less demand to fly during this day of the week. Flights from Chicago O'Hare Intl Airport to Ireland on a Saturday will generally be more expensive and average around $890. 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 evening. momondo users have found flights departing from Chicago O'Hare Intl Airport to Ireland in the evening for as low as $793. 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 afternoon when prices are around $873.

Fly from Chicago O'Hare Intl to Dublin for the best Chicago O'Hare Intl - Ireland flight prices

You are more likely to see cheaper flights to Ireland from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around $700 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from Chicago O'Hare Intl Airport for as low as $641 on momondo.

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

British Airways, United Airlines, and Delta are the most popular carriers operating from Chicago O'Hare Intl to Ireland

Aer Lingus, United Airlines and American Airlines are the top three most popular airlines that fly to Ireland from Chicago O'Hare Intl Airport 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 13 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

Historically, on average around 25% of flights between Chicago and Ireland have experienced a delay on any given week. The average delay length over the past 12 months has been 155 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.

Sunday 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, American Airlines have had the least number of delays on this route over the last 12 months; with about 18% of their flights experiencing any sort of delay.

As of September 2026, 16 flights take off from Chicago O'Hare Intl Airport and land in Ireland each day. The most common flight departure time for this route is 8:00PM, with 76% of daily flights taking off in the evening.

As of September 2026, there are 117 flights per week flying from Chicago O'Hare Intl Airport to Ireland. The most common day of the week flights depart is Mon, with 15% of flights taking off on this day.