Aer Lingus is offering flights to Dublin or Shannon from more than 40 cities including Chicago, Dallas, New York City, and San Francisco. Travel is available from mid-January through March.
Icelandair is offering sale fares from $325 round-trip to featured destinations like Amsterdam, Copenhagen, Paris, and Reykjavik. Travel is available from Boston, New York, and Seattle.
Members of Spirit's fare club can take advantage of round-trip fares from $18 to destinations including Boston, Orlando, and Cancun. The majority of exclusive fares are well-priced, though US Airways offers savings on one key route.
It started with Southwest, and now United wants to acquire your last-minute holiday airfare business. United's fares offer savings, as do those from AirTran, American, Continental, Frontier, JetBlue, Southwest, Virgin America, and others.