My wife and I are going to be in Copenhagen for a week or so in mid July, and again at the end of September. If it can be feasibly done in 3 or 4 days, we'd like to get a taste of the Norwegian fjords. Are short fjord cruises/tours even available? We're both retired teachers, so cost is a consideration. If short cruises are available, what is the best jumping? Bergen? Some place else? Any recommendations re: tour companies?
You could do Norway in a Nutshell. Can be done in one long day from Bergen. Check out RS guidebook for all the details.
Bergen, Trondheim and Ålesund can all be used to reach the fjords. Day tour buses are easy from Ålesund. There’s also a train (change at Dombås) from Oslo (inc the airport) to Åndalsnes which is also on a fjord. The Norway in a nutshell I haven’t done, it may be busier.
I did a Norway-Nutshell variant in May - Sognefjord in a Nutshell (fast ferry ("hurtigruten") through the Sognefjord; NiN offers cruises through adjacent, smaller fjords but is pretty much the same depending on how one customizes a tour). Both versions are customizable to an extent, including overnight stays and where to stay, and day-trip options. Worth doing at least one time no matter which version and how it's customized. I used Borton Overseas/Minneapolis to set up my trip but it's entirely arrangeable on one's own whether through https://www.norwaynutshell.com or putting it together through the various transportation modes and hotel websites.