Cheap flights from Illinois to Ireland from $258

In general, January is the cheapest month to fly from Illinois to Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $496. If you aren’t able to travel to Ireland during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $520.

The cheapest day to depart on your flight to Ireland is on a Monday when prices can be found for as low as $719. This is often the case because there is less demand to fly during this day of the week. Flights from Illinois to Ireland on a Friday will generally be more expensive and average around $826. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

According to our data, the cheapest time of day to fly to Ireland is in the evening. momondo users have found flights departing from Illinois to Ireland in the evening for as low as $734. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Ireland is in the afternoon when prices are around $791.

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 $670 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ireland from Illinois for as low as $632 on momondo.

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

Air Canada, United Airlines, and British Airways are the most popular carriers operating from Illinois to Ireland

Aer Lingus, United Airlines and American Airlines are the top three most popular airlines that fly to Ireland from Illinois according to our data. Aer Lingus is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Ireland. Keep in mind that there are 15 different airlines that fly to Ireland on a routine basis, so you have a few additional options to choose from.

As of March 2026, 9 flights take off from Illinois and land in Ireland each day. The most common flight departure time for this route is 7:00PM, with 73% of daily flights taking off in the evening.

As of March 2026, 67 flights take off from Illinois and land in Ireland each week. The most common flight departure day for this route is Mon, with 21% of weekly flights taking off on this day.