Here's how:
If you run a regular search JFK-TLV departing the week before Purim and returning the week after, the best you get is almost 700$ and includes very long stopovers.
You have to make 2 separate trips: 1. JFK-SVO 2. SVO-TLV
Example:
Trip 1: Depart JFK on Monday, March 2 at 2:20PM Land at SVO 7:20AM Teusday morning, March 3.
Return from SVO on Wednesday, March 11 at 9:50AM land at JFK at 1:30PM.
Price: 383$
Trip 2: Takeoff from SVO on Tuesday March 3, at 9:00AM, Land in TLV at 12:20PM
Return from TLV on Wednesday March 11, at 1:00 AM, Land in SVO at 6:10AM
Price: 174$
You end up with a 557$ round-trip flight on the same carrier with short stopovers.
Should work for other dates also.
Enjoy!