I got 100 Euros as travel credit from SAS. I want to travel from Copenhage to Mumbai on 18th August, 2018 and return on 10th September, 2018. When I search for the cheapest available flights using google search or other cheap booking sites, I see SAS flights as one of them. The cost is usually around 3200 DKK as of now fot the total roundtrip. My question is: Can we use SAS travel credits when we use other cheap sites to book our tickets? The SAS flight is from Munich to Copenhagen. If I go to the SAS website, I find the total flight cost is around 5000 DKK.

Any help would be appreciated.