SkyTeam doesn't fly to KEF?
 

I didn't find it too surprising that Delta didn't fly there (though a flight from NYC would seem reasonable), but KLM doesn't have a route from AMS, and AF didn't from CDG.


Does anyone know if there's a reason that all of Skyteam doesn't service Iceland?

No demand. KEF is not centre on the universe. But for the size-population has a lot of airlines flying to/from KEF. Many seasonal flights. Many low cost carriers.
https://en.wikipedia.org/wiki/Keflav...tional_Airport
DL looks to have a seasonal flights. But wikipedia is not always up to date

DL does fly to KEF, but maybe it’s seasonal.

AFAIK DL service is seasonal and isn't the real TATL D1 etc. IIRC there are also seasonal flights from Europe on SkyTea,, probably KLM.

Yes, I saw a DL 757 in KEF when I was there in summer.
AF/KL are sending their LCC Transavia to cover this low-yield destination. From the other end, FI is often putting their 767 on the AMS-route with a lot of package tourists.