I'm using matrix.itasoftware.com, it allows you to search for flights very specifically and using some routings and faring codes. This is the query I used to find the flights posted above:




Specifically I'm looking for flights from LHR to all the airports on the right, I'm searching the whole month starting today and want there to be 0 nights at my destination.
As for the routing, I want three SK flights or more (+) on the outbound and two (or more) on the return and I want the tickets to be booked in booking class "A".

This brings me an overview and a price for every day in the next 30 days, where the cheapest would be in the last few days of January:



Here is another example of the options I get when selecting the XX of January and it gives me all the options that fit my search criteria for that day:


And I chose this flight due to personal preference and the connection times: I included the faring infor as well in the screenshot.



This is basically a simple LHR-GOT round trip ticket routed via some stops. Should be possible to buy this ticket directly on SAS.com, or you can use google flights to replicate the routing and maybe it will forward you to SAS directly or some OTA. Using Matrix powertools you can also directly get yourself routed to some OTAs, the airline website or google flights, but this doesn't always work. I found that calling SAS often allows me to book these tickets when they are not able on sas.com.