Cheap flights from Chicago O'Hare Intl Airport to Ireland from €221

The month of February is another great option to travel to Ireland, with average flight prices from Chicago O'Hare Intl Airport averaging around €451.

The cheapest day to depart on your flight to Ireland is on a Thursday when prices can be found for as low as €556. 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 Saturday because tickets tend to average around €756. These prices are subject to change though, so be sure to set up a Price Alert for flights to Ireland.

In the evening 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 €565. Flying to Ireland in the evening 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 afternoon when prices are around €659.

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 €584 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 €551 on momondo.

There is only 1 cabin class available to choose from on Chicago O'Hare Intl 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 23% 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 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, Aer Lingus have had the fewest delays on this route over the last 12 months, with about 19% of their flights experiencing any sort of delay.

As of March 2026, there are 9 flights per day flying from Chicago O'Hare Intl Airport to Ireland. The most common time of day flights depart is 19:00, with 66% of flights taking off in the evening.

As of March 2026, there are 68 flights per week flying from Chicago O'Hare Intl Airport to Ireland. The most common day of the week flights depart is Mon, with 21% of flights taking off on this day.