Nice Business fares from France to Europe (from 400€ to 500€)
For instance NTE-MRS-CDG-LIS and return for 420€ and 108xp (or 116 if you hold the abonnée card)= 3,62€/xp.
Portugal is without quarantine restriction for French residents.
From GVA, there are also a lot of 455€ for same day turnaround and 120xp