Use Flögufoss as a Breiðdalur-and-coast decision, not as a destination that should own the whole day. It works best when the drive already belongs to the Eastfjords rather than a pure cross-country push.
The simplest pairing is Breiðdalsvík. The village gives Flögufoss a practical anchor, and the stop makes more sense when it belongs to the same local stretch instead of being a random interruption. Berufjörður can extend that logic if you want the same day to lean more scenic and less transactional.
If you are using Egilsstaðir as your East Iceland base, Flögufoss usually works as part of a longer regional drive rather than the single reason to leave town. Seyðisfjörður, Stórurð, and other larger East Iceland draws compete for the same daylight, so the real question is whether your trip needs a quieter scenic pause or a bigger headline stop.
This is also where the Ring Road comparison matters. On a fast lap, Flögufoss is an optional texture stop. On a slower East Iceland day, it becomes one of the places that makes the region feel less like a transit corridor and more like a place you actually explored.
If this part of the Eastfjords deserves more than one stop, pair Flögufoss with Beljandi Waterfall for the Breiðdalur water-and-valley angle, or continue toward Berufjörður for a broader fjord-driving pause.