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Liberty Travel offers United roundtrip fares from Chicago to Dublin for $625, as provided by ShermansTravel. That's the lowest price we could find for this route by $21. This price is valid on flights departing from Chicago, IL, (ORD) to Dublin, Ireland, (DUB); prices vary depending on the departure cities and dates chosen. Book this travel deal by January 31 for travel March 13 through April 30.