Most fares from the East Coast range in the mid to upper $600 range with the best fare being between Newark and Basel which can be booked for only $617. Fares from the West Coast start in the upper $600 range but you can book Los Angeles / Basel for only $617.
The fare sale has 2 periods of availability, one for late summer travel and the other for winter travel. The late summer fare deals are available for travel between August 28 and October 29. The winter fare deal is available for travel between October 30 and December 15 AND between January 9 and March 31. Weekend surcharges will apply if you travel Thursday through Sunday.