Travel from Germany to France

I don’t know what current procedure is, but when I traveled from Trier, Germany to Paris a few years ago, French police walked down the aisle of the train checking passports once we crossed the border into France.

With the reports I have seen recently of numbers going up dramatically, whatever the procedure is today, may change, perhaps multiple times, in the next three weeks.

I see a couple of issues. 1) Can I go to Strasbourg 2) Can I go back to Frankfurt from Strasbourg ( assuming that is where your return flight originates)

I see it as a day of travel decision.

Good luck.

My experience is returning back into France from Italy, not from Germany, so may or may not be applicable/instructive.

But it is that the French always check passports/I.d. cards — during Covid times or not.

(I have been coming back into France from Italy a couple of times a year for 15 years now.)

In normal times, there are only (more or less random) spot checks at the French/German border. This was different for a couple of weeks this year, when lots of border crossings were completely closed and others strictly controlled. Now it's back to spot checks.

As of today, the German Foreign Office advises against unnecessary, touristic travel to France except Grand-Est, of which Strasbourg is part. With Grand-Est not being considered as a risk area, going there and returning to Germany is not problematic from the German perspective: https://www.auswaertiges-amt.de/de/aussenpolitik/laender/frankreich-node/frankreichsicherheit/209524
I don't know about the current perspective of the French government on this issue; I imagine there might be restrictions if you are coming from a risk area.
Once again, that is the situation today. Tomorrow might be different.