Dave from Kirkwood on 3/18/2014 7:34:48 AM:
In the mid-latitudes (30-60 north or south), the winds generally blow west to east. Along the equator, easterly winds are more common. This is all based on Hadley cell air circulation and the Coriolis effect.
Of course, the wind varies here daily (based on fronts moving through), and strong northerly or southerly winds are common, but easterlies less so . West-to-east is more likely to offer a tailwind, but it will depend on the day.