The cheapest Dublin to Chicago return flight on the radar right now is €389, flying with Icelandair via one or more connections. It covers departures in December 2026, and every dated link below opens that exact DUB–ORD search on Skyscanner. Across 97 recorded checks it has ranged between €196 and €531. Our sampling points to December 2026 as the cheapest month to fly Dublin to Chicago.
Every fare here is re-confirmed against Skyscanner automatically, and each one is stamped with the moment it was last checked, so you can see how fresh it is instead of taking it on trust. Not flying from Dublin? We track 61 other departure cities for Chicago, listed at the foot of this page.
Fares move quickly. If this Dublin to Chicago price has gone by the time you search, shift the dates a day or two either side, because the same route is often still cheap just next door.