I want to fly from Stockholm ARN to Ålesund AES on 4th August.

There's a pair of flights that are ideal for me SK867 and SK1326. It is a tight connection, 50 mins, but minimum connection time at Oslo for Shengen to domestic is 45 minutes. I'd be flying hand luggage only anyway.

I could of course buy two singles but that is inevitably more expensive than it should be.

I'm talking about booking direct with SAS on their website.

Any ideas why and best way to get round this?