Buy a round trip. Find the min/max stay rules for the cheapest fares and then look for itins with inventory in those cheapest fare buckets. I see DL-coded fares at $1,338 in your date range. YVR departures can be a lot cheaper. I see a YVR-AMS -- AMS-CDG-YVR at US$695.
ITA Matrix:
http://matrix.itasoftware.com/
Last edited by 3Cforme; May 11, 2019 at 7:02 am