Cheap flights from Ireland to Chicago from €320

The cheapest month to fly to Chicago from Ireland is in September. Flight prices, which tend to average around €237, are often lower during this time because this is during the off-season. If you don’t want to visit Chicago in September, then you should wait until January to fly from Ireland, when ticket prices are also cheap, with an average price of €318.

On average, the least expensive day to fly to Chicago from Ireland is on a Thursday. momondo users have found tickets for Thursday departures for as low as €640. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Chicago on Sunday is €786.

In the afternoon is the cheapest time of day to fly from Ireland to Chicago when you can find flight prices for as low as €610. Flying to Chicago in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at midday when prices are €779 on average. Flights to Chicago from Ireland at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to Chicago from Ireland when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around €583 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from Ireland for as low as €500 on momondo.

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

Aer Lingus, JetBlue, and TAP AIR PORTUGAL are the most popular carriers operating from Ireland to Chicago

Aer Lingus, United Airlines and Finnair are the top three most popular airlines that fly to Chicago from Ireland according to our data. Aer Lingus is the first choice among our users, with 68% of people opting to fly with this airline when travelling to Chicago. Keep in mind that there are 4 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.

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 departing in the morning have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week that experiences the fewest 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 fewest 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 is 20 per day as of June 2026. The most frequent departure time is 11:00, with 79% of daily flights leaving at midday.

As of June 2026, there are 145 flights per week flying from Ireland to Chicago. The most common day of the week flights depart is Sun, with 15% of flights taking off on this day.