Time changes are funny - that KEF-SEA flight leaves at 1700, arrives at 1745 same day (both times are local, of course). Personally, I'm just amazed that a narrowbody (even a larger one like a 757) can make it KEF-DEN/SEA nonstop. I guess it's only a few hundred miles more (3,349 vs 3,617) than DEN-HNL, which I can believe a little more easily, but still... strange.