Cheap flights from Illinois to Ireland from €163

The month of January is another great option to travel to Ireland, with average flight prices from Illinois averaging around €293.

The cheapest day to depart on your flight to Ireland is on a Thursday when prices can be found for as low as €552. 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 €919. 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 Illinois to Ireland when you can find flight prices for as low as €669. 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 €852.

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

You are more likely to see cheaper flights to Ireland from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Ireland for around €580 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 Illinois for as low as €553 on momondo.

20 flights are operational daily from Illinois to Ireland as of May 2026. The most popular departure time for this route is 20:00, with 80% of flights per day taking off in the evening.

The number of flights available between Illinois and Ireland is 140 per week as of May 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.