Iceland Air often has sales, and the current one ends December 2nd and travel dates are through the end of March. I always look at their emails, but this one really panned out for us. Flying from Seattle, our flights are always on the higher end, but this time I was able to get r/t tickets booked for $548 each, Economy Standard. If you wan't to go Economy Light it is quite a bit cheaper, but you don't get a checked bag, etc. When I mentioned this deal to my husband, he said "book it!", as if I needed any encouragement;)
Another great deal for Iceland is that Center Hotels in Reykjavik are having their own Black Friday sale and rooms are 40% off. You must book before. Dec. 9th, but travel dates go to the end of May. This deal includes breakfast, early check in/late check out (if available) and a welcome drink. We have stayed at the Center Hotel's many times so knew this was a great deal and yes I booked it as well:) You can also book a 30% discount on gift cards that are good for 2 years. So you could purchase those now and then decide when you want to travel.