Cheap flights from Ireland to Chicago from €328

In general, March is the cheapest month to fly from Ireland to Chicago O'Hare Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around €349. If you are unable to visit Chicago O'Hare Intl Airport during the month of March, then departing from Ireland during the month October is also very affordable. Most momondo users find prices during this month for around €354.

On average, the least expensive day to fly to Chicago O'Hare Intl Airport from Ireland is on a Thursday. momondo users have found tickets for Thursday departures for as low as €632. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Chicago O'Hare Intl Airport is Sunday, with ticket prices averaging around €787.

Our data shows that the cheapest Ireland to Chicago O'Hare Intl Airport flights are usually those with departure times in the afternoon. Our users have found flights to Chicago O'Hare Intl Airport in the afternoon for as low as €610. Flights to Chicago O'Hare Intl Airport are more costly at midday, with an average ticket price of €779. Departure times at midday fall within the peak daily travel times, which is why tickets can be more expensive.

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 €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 O'Hare Intl Airport from Ireland for as low as €500 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.

JetBlue, TAP AIR PORTUGAL, and British Airways are the most popular carriers operating from Ireland to Chicago O'Hare Intl

Aer Lingus, United Airlines and Finnair are the top three most popular airlines that fly to Chicago O'Hare Intl Airport 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 O'Hare Intl Airport. Keep in mind that there are 4 different airlines that fly to Chicago O'Hare Intl Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 13% 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 143 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.

Monday 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 O'Hare Intl Airport 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, 144 flights take off from Ireland and land in Chicago O'Hare Intl Airport each week. The most common flight departure day for this route is Fri, with 15% of weekly flights taking off on this day.