Reading some traveller comments, I feel really bad for people. Many are cancelling their entire plans as alternative flights are too expensive. Considering you prepay a lot of accommodation, Blue Lagoon ect, it's painful.
A couple of days ago our Amsterdam-Reykjavik flight was looking empty, both Y and J, guessing that'll change over the next few days. So glad we went with Icelandair (J), not that there was much debate, I didn't like the WOW reviews and their lack of J seating saved us in the end. Who'da thought, paying for J saved us money and stress.