I did Stockholm this past winter and barely got back on Boss' flight. last seat using S2--coach. Feb I think it was...
Your cheapest option is usually AF zed which is priced as joint venture fare. If you're using DL metal as afar as possible, maybe CDG is best since they prob have more AF flts to ARN? CPH was tight also, BTW. Make sure you get your ezed prior (you can estimate these on the nonrev calculator on deltanet) Choose the Eu gateway where you can overnight easily.
Can't say much about KLM--haven't used them for zed.
What's your station?