A great deal to Israel from Chicago!
You can fly from Chicago (ORD) to Tel Aviv (TLV) for as low as $639 round trip, including taxes, during January-March of 2014!
See the image below of a search we did using ITA Matrix Software for sample available dates. (We did this search based on flights for 8-15 night stays, so results may differ depending on the length of stay.)
The cheapest flights are on Air Canada and have a stopover in Toronto (YYZ). Other cheap flights are on Delta (JFK stopover), KLM (AMS stopover), and a few other options.
Act fast before these flights disappear.