Cheap flights from Ireland to Illinois from $315

The cheapest month to fly to Illinois from Ireland is in September. Flight prices, which tend to average around $272, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $365.

The cheapest day to depart from Ireland to Illinois is on a Wednesday when prices can be found for as low as $755. Flights from Ireland to Illinois on a Monday will generally be more expensive and average around $885. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Ireland to Illinois during this time can be as low as $792. Flights at noon are often more expensive with an average ticket price of $818.

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

You are more likely to see cheaper flights to Illinois from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $664 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Ireland for as low as $483 on momondo.

The number of flights available between Ireland and Illinois is 18 per day as of May 2026. The most frequent departure time is 11:00AM, with 77% of daily flights leaving at noon.

As of May 2026, 130 flights take off from Ireland and land in Illinois each week. The most common flight departure day for this route is Thu, with 15% of weekly flights taking off on this day.