unusual cost granada to marseille

hello.

I checked expedia and other airlines about flights from Granada to Marseille. I was astounded to see $1200. when cut into 2 flights, it comes down to $450 pp.

it is still a little expensive. is there a ferry that goes from the costa del sol area to Marseille? we are planning for a may/june 2016 travel. in fact, we are coming from Lisbon, to costa del sol, to Marseille.

thanks.
olivia