Cheap flights from Chicago to Ireland from €223

The month of January is another great option to travel to Ireland, with average flight prices from Chicago averaging around €296.

The cheapest day to depart on your flight to Ireland is on a Thursday when prices can be found for as low as €557. 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 €928. 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 to Ireland when you can find flight prices for as low as €649. 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 €709.

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

You are more likely to see cheaper flights to Ireland from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around €583 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 for as low as €540 on momondo.

There is only 1 cabin class available to choose from on Chicago 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 157 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 20% of their flights experiencing any sort of delay.

The number of flights available between Chicago and Ireland is 23 per day as of May 2026. The most frequent departure time is 20:00, with 82% of daily flights leaving in the evening.

161 flights are operational weekly from Chicago to Ireland as of May 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.