Aer Lingus offers roundtrip flights to Ireland, UK, and Europe with prices starting at $561.28. (Click on "AerLingus" in the top line to see this sale; all taxes are included.) That's tied with our mention from last month as the second-best base rate we've seen for Aer Lingus fares this year. It's also the lowest current rate we could find by $82. This price is valid on flights from New York, NY, (JFK) with arrival in Dublin, Ireland, (DUB) departing on January 18, 2015 with return on January 25, 2015; prices vary depending on the departure cities and dates chosen. Book this travel deal by December 17 for travel from January 10, 2015 through March 31, 2015. Click here to see more routes.