Cheap flights from Ireland to Chicago from $357

The month of October is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Ireland averaging around $406.

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Sunday when prices can be found for as low as $681. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from Ireland because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $879.

Flying to Chicago O'Hare Intl Airport from Ireland in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $795 when looking at flights departing in the afternoon. Try not to purchase tickets in the morning because they tend to be around $812. 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 - Chicago O'Hare Intl flight prices

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $678 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from Ireland for as low as $574 on momondo.

There are 3 cabin classes available to choose from on Ireland to Chicago O'Hare Intl Airport 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 14% of flights between Ireland and Chicago have experienced a delay on any given week. The average delay length over the past 12 months has been 142 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the morning have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Tuesday has historically seen more delays on average compared to the rest of the week.

According to our data, Aer Lingus have had the least number of delays on this route over the last 12 months; with about 8% of their flights experiencing any sort of delay.

The number of flights available between Ireland and Chicago O'Hare Intl Airport is 18 per day as of July 2026. The most frequent departure time is 11:00AM, with 79% of daily flights leaving at noon.

As of July 2026, there are 128 flights per week flying from Ireland to Chicago O'Hare Intl Airport. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.