Cheap flights from Chicago O'Hare Intl Airport to Ireland from €266

The month of August is another great option to travel to Ireland, with average flight prices from Chicago O'Hare Intl Airport averaging around €130.

The cheapest day to depart on your flight to Ireland is on a Thursday when prices can be found for as low as €644. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Wednesday because tickets tend to average around €932. These prices are subject to change though, so be sure to set up a Price Alert for flights to Ireland.

In the afternoon is the cheapest time of day to fly from Chicago O'Hare Intl Airport to Ireland when you can find flight prices for as low as €653. Flying to Ireland in the afternoon is an ideal time because this is during off-peak travel hours. In contrast, the most expensive time of day to depart to Ireland is in the evening when prices are around €713.

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 €591 when searching weeks before you fly. 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 €554 on momondo.

There is only 1 cabin class 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.

Historically, on average around 24% 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 158 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing in the evening 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. Wednesday has historically seen more delays on average compared to the rest of the week.

According to our data, American Airlines have had the fewest delays on this route over the last 12 months, with about 21% of their flights experiencing any sort of delay.

As of June 2026, there are 22 flights per day flying from Chicago O'Hare Intl Airport to Ireland. The most common time of day flights depart is 20:00, with 82% of flights taking off in the evening.

As of June 2026, there are 159 flights per week flying from Chicago O'Hare Intl Airport to Ireland. The most common day of the week flights depart is Wed, with 14% of flights taking off on this day.