I live in Reykjavik, west side and close to the ocean. From the coast line there it is about 35km or 22 miles direct line of sight to the eruption site. I went out about 1 hour and 15 minutes after the eruption started and saw the lava flow about 100-150m in the air with my bare eyes. I've seen a few eruptions but they are always mesmerizing!
A (not very good) photo I took: https://imgur.com/a/Yc2apSu