Isn't iceland an incredible place though, that's a shame you didn't get to see them, I went there in October and saw them, was quite strange I was expecting to see them like you do in the photos I.e big streak of green and purple going across the sky but all you see is white until you take a photo with the right aperture.
Here's one of the photos I could get, it's a bit blurry but best i could do without a tripod