Originally Posted by
fumje
edit: But to clarify my original question—I was interpreting mherdeg's final paragraph as meaning that although no CDG-EWR discount economy fares were offered, searching for a CDG-HNL with stopover in EWR might allow purchase of the CDG-EWR in a lower-priced fare bucket. Is that not the case? Or is there just no straightforward way to figure out the latter knowing only knowing CDG-EWR fare rules?
Correct - fares are generally done origin to destination, unless it's cheaper to have a fare break, where the site might bring that up. While Y might be the cheapest published fare on CDG-EWR for a one-way, CDG-HNL may have a published One way V fare which starts with the same CDG - EWR flight. That's where the buckets come in - while they aren't willing to sell a one-way V fare just to EWR one - way (after all, there's no V published allowing one-way), they may be willing to sell one to someone going to another destination, but makes a connection in EWR.
Now that V fare may allow for a stopover, or allow a stopover for a minimal cost. In that case, you could get on the CDG-EWR flight, stop for 2 days, and then go onward to HNL on a V fare.