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Icelandair via Priceline [priceline.com] has round trip airfares travelling from New York City (JFK) to Paris (ORY) for $ 398 including taxes and fees. This makes a stop in Reykjavik Iceland (KEF). Icelandair allows a stopover in Iceland for up to 7 days so this makes two-trips-one deal and pretty fantastic too.

This is much like the recent Seattle-Paris deal I posted. You can read that thread for comments.