When in December are you considering? Christmas week is the busiest and most expensive of the entire year. Early December may still be off-season with some companies. Airfares are generally much higher at Christmas as well.

There are a number of tips for saving on airfare. Try booking early Tuesday morning and traveling midweek. Check to see if two one-way tickets work better than round-trip, as schedules may work better in one direction. Buy all your flights on one ticket to avoid problems caused by flight delays or cancellations. If you travel through STT, be sure to include the cost of taxis and ferries (including baggage) which have risen.