not sure what kind of help you need.
There are tons of options depending if you are worried about collecting miles or not.
Sticking with *A you can do Brussels, Lufthansa or Turkish
Skyteam would be KLM or AF
There are no non-stop flights so these would connect in Brussels, Frankfurt, Istambul, AMS or CDG.
It really depends of where you want to spend 24 hours or if you prefer to get to TLV as quickly as possible.
You could also go via LHR and you can also connect with El-Al if that matters to you (security issues).
Regarding prices, it really depends on the day and time.
Not sure what is the rest of the trip so not sure how to help you build it up. If you are starting in Helsinki and going Helsinki-TLV-FRA-ORD you will pay lots of money