Cheap flights from Ireland to Chicago from £375

The cheapest month to fly to Chicago O'Hare Intl Airport from Ireland is in November. Flight prices, which tend to average around £352, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Chicago O'Hare Intl Airport from Ireland during February instead. Flights to Chicago O'Hare Intl Airport in February, while not as cheap as those in November, still average around £459.

The cheapest day to depart from Ireland to Chicago O'Hare Intl Airport is on a Tuesday. Travellers who choose to depart for Chicago O'Hare Intl Airport on a Tuesday will often find tickets for as low as £548. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Chicago O'Hare Intl Airport on Saturday is £656.

The cheapest time of day to fly to Chicago O'Hare Intl Airport is in the afternoon when flights can be purchased for as low as £479. In contrast, the most expensive time of day to depart to Chicago O'Hare Intl Airport is at midday when prices are around £681.

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 £504 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 £424 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.

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

Aer Lingus, Finnair and United Airlines 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 59% of people opting to fly with this airline when travelling to Chicago O'Hare Intl Airport. Keep in mind that there are 6 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 12% 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 158 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.

Wednesday is statistically the day of the week that experiences the fewest delays on this flight route. Saturday 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 7% 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 August 2026. The most frequent departure time is 11:00, with 81% of daily flights leaving at midday.

As of August 2026, 129 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 Mon, with 15% of weekly flights taking off on this day.