If you provide the origin/destination airports and date(s) of travel, some kind soul will probably look up the fares on ExpertFlyer for you.

For international flights (if by international you mean outside of the US), SWUs can be used to upgrade Q fares but not S fares. If the two codes you put in your post are indeed fare basis codes, then it looks like the first flight will be upgradeable (outbound?) but the second (return?) will not.