Cheap flights from Ireland to Illinois from €358

The cheapest month to fly to Illinois from Ireland is in November. Flight prices, which tend to average around €425, are often lower during this time because this is during the off-season. If you’re not able to fly to Illinois in November, then September is your next best option. Flight prices from Ireland to Illinois during September average around €501.

According to our data, Thursday is the cheapest day to fly to Illinois from Ireland. The lowest ticket price found for a Thursday departure recently was €638. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. On the other hand, Sunday is the most expensive day to depart from Ireland because it is more convenient for both business and leisure travellers. As a result, prices tend to be around €783.

According to our data, the cheapest time of day to fly to Illinois is in the afternoon. momondo users have found flights departing from Ireland to Illinois in the afternoon for as low as €624. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Try not to purchase tickets in the morning because they tend to be around €709. Of course, these prices can vary depending on the time of year and what airport you fly to.

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 €581 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Ireland for as low as €455 on momondo.

There are 3 cabin classes available to choose from on Ireland to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Aer Lingus and WestJet are the most popular carriers operating from Ireland to Illinois

Aer Lingus, United Airlines and Finnair are the top three most popular airlines that fly to Illinois from Ireland according to our data. Aer Lingus is the first choice among our users, with 65% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

As of September 2026, 19 flights take off from Ireland and land in Illinois each day. The most common flight departure time for this route is 11:00, with 83% of daily flights taking off at midday.

As of September 2026, there are 137 flights per week flying from Ireland to Illinois. The most common day of the week flights depart is Thu, with 15% of flights taking off on this day.