Cheap flights from Ireland to Chicago from £238

The cheapest month to fly to Chicago from Ireland is in September. Flight prices, which tend to average around £200, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Chicago from Ireland during January instead. Flights to Chicago in January, while not as cheap as those in September, still average around £268.

The cheapest day to depart on your flight to Chicago is on a Tuesday when prices can be found for as low as £528. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Chicago is Saturday, with ticket prices averaging around £601.

Flying to Chicago from Ireland in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as £472 when looking at flights departing in the afternoon. Flights at midday are often more expensive, with an average ticket price of £598.

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 £487 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 £354 on momondo.

JetBlue, TAP AIR PORTUGAL, and Delta 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 65% of people opting to fly with this airline when travelling to Chicago. Keep in mind that there are 5 different airlines that fly to Chicago 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 139 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 is 18 per day as of May 2026. The most frequent departure time is 11:00, with 77% of daily flights leaving at midday.

As of May 2026, 128 flights take off from Ireland and land in Chicago each week. The most common flight departure day for this route is Fri, with 16% of weekly flights taking off on this day.