Anyway to book 1-way ewr-tlv without the crazy 1 way prices? (Domestic after many years finally stopped surcharging for 1 way, how come International they still do?)
Try a TA. They may have net dares that will work for OWs. Should be around $800.
$800? Roundtrip EWR-TLV-BOS is $690. Just skip the return.
And what if his departure date is not available in K? (yes, I know that idea was mine. But being that I'm also a TA, I also KNOW that TA's are still good for something (like ilherman mentioned))
A much simpler solution would be to just post his dates. Then the OTA people can search, the TA's can post a quote, and may the best price win.